J-GLOBAL         Last updated: Jun 20, 2018 at 16:18
Kumamoto University
Institute of Pulsed Power Science
Job title
Doctor of Engineering(Kyushu University), Master of Engineering(Kyushu University)

Research Areas


Published Papers

Xin Gao, Naoaki Yokota, Hayato Oda, Shigeru Tanaka, Kazuyuki Hokamoto, Pengwan Chen
Crystals   8    Feb 2018
© 2018 by the authors. Licensee MDPI, Basel, Switzerland. The Fe–FeO–graphene nanocomposite material was produced successfully by pulsed wire discharge in graphene oxide (GO) suspension. Pure iron wires with a diameter of 0.25 mm and a length of 1...
Kazuyuki Hokamoto, Koshiro Shimomiya, Masatoshi Nishi, Lovre Krstulović-opara, Matej Vesenjak, Zoran Ren
Journal of Materials Processing Technology   251 262-266   Jan 2018
© 2017 Elsevier B.V. A method for fabricating an unidirectional porous (UniPore) aluminum structure employing a cylindrical explosive compaction assembly is proposed and the condition for successful recovery is discussed. The microstructure of the...
Atsushi Yasuda, Atsushi Yasuda, Eisuke Kuraya, Akiko Touyama, Osamu Higa, Osamu Higa, Kazuyuki Hokamoto, Shigeru Itoh
Journal of Food Engineering   211 15-21   Oct 2017
© 2017 Elsevier Ltd Carrots (Daucus carota L.) are an important source of antioxidants with both lipophilic (carotenoids, xanthophylls) and hydrophilic (polyphenols) properties. In this study, we evaluate the yield and carotenoid content of the ju...
I. A. Bataev, D. V. Lazurenko, S. Tanaka, K. Hokamoto, A. A. Bataev, Y. Guo, A. M. Jorge, A. M. Jorge
Acta Materialia   135 277-289   Aug 2017
© 2017 Acta Materialia Inc. During an explosion, the interfaces of welded materials experience fast heating due to high strain rate severe plastic deformation. This leads to the formation of local zones, where melting and mixing of welded material...
Satya Narayan, Shigeru Tanaka, Akihisa Mori, Kazuyuki Hokamoto
Journal of Materials Processing Technology   245 300-308   Jul 2017
© 2017 Elsevier B.V. Effect of distance between the explosive and the center of the sample on welded Sn/Cu interface was investigated. Distance was varied to change the pressure applied to the plates to be welded. Morphology of interfacial microst...
Masahiro Nishida, Kaito Ishida, Fumiya Kodama, Koichi Hayashi, Yasuhiro Akahoshi, Kazuyuki Hokamoto, Tsuyoshi Mayama, Michiaki Yamasaki, Yoshihito Kawamura
Procedia Engineering   173 65-72   Jan 2017
© 2017 The Authors. Long period stacking ordered (LPSO) type magnesium alloys have the low density, excellent mechanical strength and ignition resistance. LPSO-type magnesium alloys have a great potential as structural materials of satellites. Lip...
Atsushi Yasuda, Atsushi Yasuda, Osamu Higa, Eisuke Kuraya, Yoshikazu Higa, Ken Shimojima, Kazuyuki Hokamoto, Shigeru Itoh
Materials Science Forum   910 MSF 169-175   Jan 2017
© 2018 Trans Tech Publications, Switzerland. In this study, we have established a novel pretreatment system that improves the juice extraction volume and nutritional value of plant material using underwater shockwaves. The optimum treatment condit...
Masahiro Nishida, Fumiya Kodama, Koichi Hayashi, Yasuhiro Akahoshi, Kazuyuki Hokamoto, Tsuyoshi Mayama, Michiaki Yamasaki, Yoshihito Kawamura
Procedia Engineering   204 270-275   Jan 2017
© 2017 The Authors. Published by Elsevier Ltd. Because long period stacking ordered (LPSO) type magnesium alloys have the low density, excellent mechanical strength and ignition resistance, LPSO-type magnesium alloys have a great potential as stru...
Shigeru Tanaka, Akihisa Mori, Hayato Oda, Daisuke Inao, Kazuyuki Hokamoto
Science and Technology of Energetic Materials   78 93-98   Jan 2017
The surface properties of metal plates were improved using tungsten carbide (WC) powder via a series of experiments, which involved explosions to cause acceleration and flight of metal plates for a high-velocity collision of the metal plates with ...
Tatsuya Yamamoto, Masatoshi Nishi, Masahide Katayama, Kazuyuki Hokamoto
Materials Science Forum   910 MSF 84-89   Jan 2017
© 2018 Trans Tech Publications, Switzerland. The mechanism of damage on the structure of an explosion pit which belongs to the Institute of Pulsed Power Science, Kumamoto University is investigated. Here, three-dimensional model with square openin...
Journal of the Japan Society for Technology of Plasticity   58(673) 156-160   2017
<p>A method for synthesizing a unidirectional porous (UniPore) aluminum structure employing a cylindrical explosive compaction assembly is proposed and the condition for successful recovery is discussed. The microstructure of the compacted samples...
Somasundaram Saravanan, Krishnamurthy Raghukandan, Kazuyuki Hokamoto
Archives of Civil and Mechanical Engineering   16 563-568   Sep 2016
© 2016 Politechnika Wrocławska.Aluminium and copper plates are explosively cladded with Al 5052, copper and SS 304 interlayers and the results are reported. While continuous molten layer is obtained in conventional explosive clads, a smooth interf...
Matej Vesenjak, Kazuyuki Hokamoto, Shohei Matsumoto, Yasuo Marumo, Zoran Ren
Materials Letters   170 39-43   May 2016
© 2016 Elsevier B.V. All rights reserved.A new type of porous metal with uni-directional pores (UniPore) has been developed using the explosive compaction fabrication process of rolled copper foil with plastic spacers. The interface bonding in the...
O. Higa, O. Higa, A. Yasuda, Y. Higa, K. Shimojima, K. Hokamoto, S. Itoh
International Journal of Multiphysics   10 343-354   Jan 2016
We have been investigating underwater-explosion-induced shockwave-propagation phenomena for use in a robust food-processing system. This system comprises a high-voltage capacitor bank with a gap switch, water tank, and wire explosive. We performed...
Matej Vesenjak, Kazuyuki Hokamoto, Motoki Sakamoto, Takuya Nishi, Lovre Krstulović-Opara, Zoran Ren
Materials and Design   90 867-880   Jan 2016
© 2015 Elsevier Ltd.The paper presents the first extensive research on microstructural and mechanical properties of a novel porous copper structure with unidirectional longitudinal pores (UniPore) structure. The unique fabrication method is based ...
I. A. Bataev, K. Hokamoto, H. Keno, A. A. Bataev, I. A. Balagansky, A. V. Vinogradov
Metals and Materials International   21 713-718   Jun 2015
© 2015, The Korean Institute of Metals and Materials and Springer Science+Business Media Dordrecht.The interface between explosively welded niobium and stainless steel SUS 304 was studied using scanning electron microscopy, transmission electron m...
Matej Vesenjak, Kazuyuki Hokamoto, Ivan Anžel, Akira Sato, Ryohei Tsunoda, Lovre Krstulović-Opara, Zoran Ren
Materials and Design   75 85-94   Jun 2015
© 2015 Elsevier Ltd.The manuscript discusses mechanical properties and microstructure of copper before and after the explosive treatment. The aim of this research was to characterize and evaluate the influence of explosive treatment which is prese...
Shigeru Tanaka, Daisuke Inao, Sou Maezono, Hironori Maehara, Kazuyuki Hokamoto
Explosion   25 150-153   Jan 2015
Masatoshi Nishi, Masahide Katayama, Masahide Katayama, Kazuyuki Hokamoto
Science and Technology of Energetic Materials   76 133-138   Jan 2015
This study investigates the effect of impulsive pressure on structure damage driven by the detonation of an explosive. A numerical analysis of the explosion pit at the Institute of Pulsed Power Science of Kumamoto University was performed. Though ...
M. Ahasan Habib, Hiroki Keno, Ryota Uchida, Akihisa Mori, Kazuyuki Hokamoto
Journal of Materials Processing Technology   217 310-316   Jan 2015
© 2014 Elsevier B.V. All rights reserved.Titanium and magnesium alloy AZ31 plates were explosively welded using the underwater shock wave technique. A thin AZ31 interlayer was utilized as a proposed method to reduce kinetic energy loss and the for...
T. Fiedler, M. Borovinšek, K. Hokamoto, M. Vesenjak
International Journal of Heat and Mass Transfer   83 366-371   Jan 2015
© 2014 Elsevier Ltd.This paper addresses the thermal testing of UniPore-paraffin composites for use as thermal capacitors. UniPore is a relatively new porous material with unidirectional pores formed by the explosive fusion of multiple thin copper...
K. Hokamoto, M. Vesenjak, Z. Ren
Materials Letters   137 323-327   Dec 2014
© 2014 Elsevier B.V.A new method to fabricate uni-directional porous (UniPore) metal employing the explosive compaction process of cylindrical pipe assembly is proposed. The proposed fabrication method enables production of long rods with uniform ...
H. Amini Mashhadi, H. Amini Mashhadi, I. Bataev, B. Mohammad Sadeghi, K. Hokamoto
Materials Chemistry and Physics   145 366-375   Jun 2014
This paper aims to report the study of the synthesis of a titanium nitride nanostructure solid solution through the reduction of aluminum nitride with titanium based on the stoichiometric reaction of 2Ti + AlN by mechanical alloying (MA) process a...
Osamu Higa, Katsuya Higa, Hironori Maehara, Shigeru Tanaka, Ken Shimojima, Ayumi Takemoto, Kazuyuki Hokamoto, Shigeru Itoh
International Journal of Multiphysics   8 245-252   Jun 2014
We have been developing a food-processing device that uses underwater shock waves generated by spark discharges at an underwater spark gap. Underwater shock waves can be used in food processing for softening, fracturing and sterilization. These te...
Wei Sun, Wei Sun, Xiaojie Li, Honghao Yan, Kazuyuki Hokamoto
Journal of Materials Engineering and Performance   23 421-428   Feb 2014
This paper aims at investigating effects of initial hardness on interfacial features for identical compositional materials under identical welding conditions. Two underwater explosive welding experiments on tool steel SKS3 with copper foil were ca...
Wei Sun, Wei Sun, Xiaojie Li, Kazuyuki Hokamoto
Applied Physics A: Materials Science and Processing   117 1941-1946   Jan 2014
© 2014, Springer-Verlag Berlin Heidelberg.We show direct evidence that underwater shock wave enables us to bond multithin plates with flat, parallel, and high-strength interfaces, which are key requirements for functionally graded material (also c...
Shigeru Tanaka, Naoki Kawaji, Naoyuki Wada, Kazuyuki Hokamoto
Science and Technology of Energetic Materials   75 106-111   Jan 2014
The synthesis of tungsten carbide was conducted by the wire explosion of tungsten under an intense electrical current in liquid paraffin, and ultrafine tungsten carbide powder in the order of nm was successfully recovered. X-ray diffraction analys...
Daichi Mori, Ryuta Kasada, Satoshi Konishi, Yasuhiro Morizono, Kazuyuki Hokamoto
Fusion Engineering and Design   89 1086-1090   Jan 2014
The present study reports the underwater explosive welding of commercially pure tungsten onto the surface of a reduced-activation ferritic steel F82H plate. Cross-sectional observation revealed the formation of a wave-like interface, consisting of...
Naoyuki Wada, Kazunori Akiyoshi, Kohji Morita, Kazuyuki Hokamoto
Ceramics International   39 7927-7933   Sep 2013
An experimental method to synthesize titanium oxide (Ti-O) through electrical wire explosion was performed. In this study, one experiment was conducted in air atmosphere, and the other with the wire fully dipped in distilled water. In air atmosphe...
Wei Sun, Xiaojie Li, Kazuyuki Hokamoto
Ceramics International   39 3939-3945   May 2013
This paper aims at developing a process technology to fabricate an aluminum dispersion strengthened coating on a copper substrate. First, nanostructured Cu-Al2O3 powder was prepared by hydrogen-reduction of mechanical alloyed Cu and Al2O3 mixed po...
Naoyuki Wada, Chang Hwan Kim, Jack J. Yoh, Hideki Hamashima, Kazuyuki Hokamoto
Materials Transactions   53 244-247   Mar 2012
An experimental method to synthesize titanium dioxide (TiO2) using high-power laser in water was performed. A high-power Nd:YAG pulsed laser was used for the synthesis, with the laser energy fixed at 1 J/pulse. This laser was focused on a titanium...
A. Nayeem Faruqui, P. Manikandan, T. Sato, Y. Mitsuno, K. Hokamoto
Metals and Materials International   18 157-163   Feb 2012
In this work, mechanical milling of magnesium with SiC particles with variation of parameters, such as ball-to-powder ratio, milling speed, milling time, and process controlling agent (PCA), is reported. Milling was also conducted without using PC...
H. Amini Mashhadi, I. Bataev, S. Tanaka, R. Tomoshige, K. Hokamoto
International Journal of Refractory Metals and Hard Materials   30 25-32   Jan 2012
This paper reports on our study of the synthesis of titanium nitride solid solution by the reduction of aluminum nitride with titanium by mechanical alloying (MA) using a planetary ball mill. A nanostructure composite of in-situ titanium nitride s...
Igor A. Balagansky, Kazuyuki Hokamoto, Palavesamuthu Manikandan, Alexander D. Matrosov, Ivan A. Stadnichenko, Hitoshi Miyoshi, Ivan A. Bataev, Anatoly A. Bataev
Journal of Applied Physics   110    Dec 2011
Results of experimental and numerical research of the Mach stem formation in explosion systems, which include high modulus elastic elements, are presented. The experimental data are discussed, and the analysis using ANSYS AUTODYN 11.0 is provided....
Shigeru Tanaka, Kazuyuki Hokamoto, Seiichi Irie, Toshihiko Okano, Zoran Ren, Matej Vesenjak, Shigeru Itoh
Measurement: Journal of the International Measurement Confederation   44 2185-2189   Dec 2011
Porous materials such as aluminum foam have been investigated for possible use as impact shock absorbers in transportation aeronautic applications. However, the response of aluminum foam during impacts at high velocities of more than 100 m/s is no...
P. Manikandan, J. O. Lee, K. Mizumachi, A. Mori, K. Raghukandan, K. Hokamoto
Journal of Nuclear Materials   418 281-285   Nov 2011
This study demonstrates the ability to clad pure tungsten foils on copper plate using underwater shock waves generated by the detonation of explosive. Microstructural characterization revealed that a higher preset inclination results in wavy morph...
H. Amini Mashhadi, N. Wada, R. Tomoshige, P. Manikandan, K. Hokamoto
Ceramics International   37 1747-1754   Aug 2011
Reactive milling of aluminum nitride and titanium powders corresponding to the stoichiometric reaction Ti + AlN resulted in the formation of the ceramic matrix composite AlN-TiN. Prolongation of the milling process led to a microstructure with nan...
Nobuyuki Matsuo, M. Otuka, H. Hamasima, K. Hokamoto, S. Itoh
International Journal of Multiphysics   5 131-143   Jun 2011
Firstly, recently, there are a lot of techniques being demanded for complex process, various explosive initiation method and highly accurate control of detonation are needed. In this research, the metal foil explosion using high current is focused...
Youngkook Kim, Fumiaki Mitsugi, Ikegami Tomoaki, Kazuyuki Hokamoto, Shigeru Itoh
Journal of the European Ceramic Society   31 1033-1039   Jun 2011
Titanium dioxide (TiO2) bulk with pure anatase phases was fabricated by an explosive compaction technique using an underwater shockwave. Dynamic shock pressure of 6GPa was used to consolidate anatase TiO2 powders. Its microstructural, crystalline ...
M. Dourandish, A. Simchi, A. Simchi, K. Hokamoto, S. Tanaka
Materials Letters   65 523-526   Feb 2011
Microstructural development and phase formation at the interface of yttria stabilized zirconia (3Y-TZP)/430L stainless steel composite layers produced by co-sintering method were studied by SEM, HRTEM, micro-focus XRD, and EPMA. Formation of a ric...
Iman Farahbakhsh, Alireza Zakeri, Palavesamuthu Manikandan, Kazuyuki Hokamoto
Applied Surface Science   257(7) 2830-2837   Jan 2011
A novel coating method utilizing mechanical alloying was used to deposit a nickel-copper solid solution on the surface of nickel balls in a planetary ball mill. Mechanically milled copper powders were deposited by cold welding on the activated sur...
Iman Farahbakhsh, Alireza Zakeri, Palavesamuthu Manikandan, Shigeru Tanaka, Kazuyuki Hokamoto
Japanese Journal of Applied Physics   50    Jan 2011
Mechanical alloying is a viable technique to produce coatings of limited thickness on a solid substrate. Elemental copper powder was mechanically alloyed with nickel balls in a planetary ball mill under various milling times and rotation speeds. T...
Shigeru Tanaka, Kazuyuki Hokamoto, Shigeru Itoh
International Journal of Multiphysics   4(3) 233-239   Oct 2010
In order to develop composite materials, new attempting was conducted. When an explosive is exploded in water, underwater shock wave is generated. Metal plate is accelerated by the underwater shock wave and collided with diamond particles at high ...
H. Amini Mashhadi, P. Manikandan, R. Suetsugu, S. Tanaka, K. Hokamoto
Journal of Alloys and Compounds   506 653-660   Sep 2010
In the present article, synthesis of AlN-TiN nanostructured composite by high-energy ball milling process (HEM) of Ti and AlN by 1:1 molar ratio and subsequent heat treatment was investigated. The microstructural evolution of samples was studied b...
Kazuyuki Hokamoto, Naoyuki Wada, Shin Ichiro Tsutsumi, Kazunori Akiyoshi, Shigeru Tanaka, Shoichiro Kai, Yasuhiro Ujimoto
Science and Technology of Energetic Materials   71 111-116   Sep 2010
A new approach for synthesizing nitride intermetallics is proposed in the present investigation. The source of nitrogen is liquid nitrogen and the reaction was induced by a metal jet generated by conical shaped charges. An aluminum jet, generated ...
P. Manikandan, A. Nayeem Faruqui, K. Raghukandan, A. Mori, K. Hokamoto
Journal of Materials Science   45 4518-4523   Aug 2010
The shock consolidation of magnesium (Mg)/silicon carbide (SiC) composites using axisymmetric explosive fabrication setup is reported. Pure Mg and SiC powders are consolidated in a three-layered cylindrical assembly with the energy being derived f...
M. Dourandish, A. Simchi, A. Simchi, K. Hokamoto, S. Tanaka
Materials Science and Engineering A   527(3) 449-453   Jan 2010
The mechanism of interface formation during sinter-joining of nanostructured yttria stabilized zirconia (27 nm) compacts with chromium powder was investigated. The effect of sintering atmosphere, i.e. argon or vacuum, was studied. Microstructural ...
S. Tanaka, K. Hokamoto, S. Torii, M. Touge, S. Itoh
Journal of Materials Processing Technology   210(1) 32-36   Jan 2010
A new method for surface coating of an aluminum plate by diamond particles is developed. Underwater shock wave derived from the detonation of an explosive acts to accelerate an aluminum flyer plate to a desired velocity, the flyer plate collides w...


Shigeru Itoh, Junji Matsue, Kazuyuki Hokamoto
Materials Science Forum   767    Aug 2013
外本 和幸
配管技術 = The piping engineering   59(9) 10-12   Aug 2017
A. Mori, S. Tanaka, K. Hokamoto
Proceedings of SPIE - The International Society for Optical Engineering   10328    Jan 2017
© 2017 SPIE. Explosive welding, one of the high energy rate material processing, is known the technique to weld strongly for the dissimilar metal combinations. When a metal is collided to the other metal at high velocity with a certain angle, good...
Kazuyuki Hokamoto
Explosion   25 112-113   Jan 2015
Hideki Hamashima, Seisaku Iwasa, Hironori Maehara, Shigeru Itoh, Kazuyuki Hokamoto
Applied Mechanics and Materials   566 403-408   Jan 2014
The basic behavior during underwater electrical discharge up to 10 kJ stored energy is investigated through both numerical analysis and optical-observation experiments. Since the authors have been investigating the use of underwater exploding phen...
Kazuyuki Hokamoto
Explosion   23 135-137   Jan 2013
Kazuyuki Hokamoto
Review of High Pressure Science and Technology/Koatsuryoku No Kagaku To Gijutsu   17 341-346   Dec 2007
In this article, current research trends and the future in dynamic processing of materials are reviewed. Some fundamentals and recent topics in the related issues are introduced for explosive welding, explosive powder compaction and shock-induced ...
A. Chiba, K. Hokamoto, S. Sugimoto, T. Kozuka, A. Mori, E. Kakimoto
Journal of Magnetism and Magnetic Materials   310    Mar 2007
Explosive consolidation of Sm 2 Fe 17 N x and Sm 2 Fe 17 N x /(Ni or Co) magnetic powders were attempted to consolidate fully dense magnetic compacts. Dense Sm 2 Fe 17 N x and Sm 2 Fe 17 N x /(Ni or Co) bulk materials were obtained by cy...
Sang Hoon Lee, Sang Hoon Lee, Kazuyuki Hokamoto
Materials Transactions   48 80-83   Jan 2007
The explosive compaction technique has been applied to consolidate WC/Co powder to make a coating layer on a steel substrate, and the microstructure and some properties are investigated. Explosive compaction was performed using an improved method ...
A. Mori, K. Tamaru, K. Hokamoto, M. Fujita
AIP Conference Proceedings   845 II 1543-1546   Dec 2006
A new method of underwater explosive welding is introduced and its possibilities are suggested. In the underwater explosive welding, a high explosive with detonation velocity of 7km/s is placed at an initial inclined angle to decrease the horizont...
Shigeru Tanaka, Kazuyuki Hokamoto, Shigeru Itoh
American Society of Mechanical Engineers, Pressure Vessels and Piping Division (Publication) PVP   2006    Nov 2006
A new attempt in developing a composite material using explosive processing was attempted. Shock wave derived from explosion energy is a viable technique and can be used to penetrate diamond powders into the metal pipe without permitting the react...
Kazuya Taira, Kazuyuki Hokamoto, Shigeru Itoh, Akihisa Mori, Rolf A. Pruemmer
American Society of Mechanical Engineers, Pressure Vessels and Piping Division (Publication) PVP   2006    Nov 2006
We tried hot explosive compaction to make bulk materials of hard-to-consolidate powders using cylindrical configuration. By heating above 1000 °C, it is possible to give the ability of plastic deformation for hard ceramic powders and also possible...
Wing Cheng, Wing Cheng, Kazuyuki Hokamoto, Shigeru Itoh
American Society of Mechanical Engineers, Pressure Vessels and Piping Division (Publication) PVP   2006    Nov 2006
Detonation of high explosive due to impact of fragments and flyer plates was modeled using hydrodynamic computer code. Included in the model were the warhead consisting of casing and high explosive (which is H-6 in this case). An 80-gram fragment ...
H. Eskandari, M. Emamy, H. M. Ghasemi, K. Hokamoto, J. S. Lee, M. Mahta
Materials Science and Technology   22 349-352   Mar 2006
Aluminium matrix composites containing 10, 20 and 30 vol.-%SiC particles were manufactured with underwater shock consolidation method. Sintering of the compact specimens was carried out at 400°C for 70 min. Density, hardness and bending strength o...
Shigeru Tanaka, L. S. Lee, Kazuyuki Hokamoto
American Society of Mechanical Engineers, Pressure Vessels and Piping Division (Publication) PVP   4 139-144   Dec 2005
Al-based composites are tried to be fabricated using dynamic compaction of powders compressed through underwater shock wave. Some composites, Al-SiCp, Al-diamond, are successfully recovered and fully densified without cracks, and the composites sh...
Toshiaki Watanabe, Kazumasa Ebihara, Kazuyuki Hokamoto, Shigeru Itoh
American Society of Mechanical Engineers, Pressure Vessels and Piping Division (Publication) PVP   4 165-169   Dec 2005
In recent years, a use for cryogenic fluids as a coolant has been increasing because of the industrial development of low temperature technology. Therefore, the use of the cryogenic pressure vessel and piping become general. LNG-tank, LN 2 , O 2 -...
P. Manikandan, K. Hokamoto, K. Raghukandan, A. Chiba, A. A. Deribas
Science and Technology of Energetic Materials   66 370-374   Sep 2005
This study addresses the effects of experimental parameters on the welded interface of titanium and stainless steel clad produced by explosive welding. A weldability window was formulated for titanium / stainless steel clad and experimentally veri...
Zhi Qiang Jin, Zhi Qiang Jin, Chris Rockett, J. Ping Liu, Kazuyuki Hokamoto, Naresh N. Thadhani
Materials Transactions   46 372-375   Feb 2005
Dynamic consolidation of powders was studied to fabricate exchange-coupled Pr 2 Fe 14 B/α-Fe nanocomposite bulk magnets, using explosively generated shock waves transmitted through water. The planar shock wave propagating into the powder had a pea...
P. Tamilchelvan, K. Raghukandan, K. Hokamoto, H. C. Dey, A. K. Bhaduri
Materials Science Forum   465-466 207-212   Nov 2004
Joining of dissimilar metals has always attracted attention of researchers because of their wider applications in aerospace, defense and naval applications. Explosive cladding is one of the non-conventional diffusion bonding techniques, which offe...
Yasuo Marumo, Hiroyuki Saiki, Liquan Ruan, Kazuyuki Hokamoto, Shigeru Itoh, Hirofumi Iyama
Materials Science Forum   465-466 337-342   Nov 2004
The characteristics of piercing a hole in amorphous alloy foil with a thickness of 0.025mm using explosive-impulsive pressure were investigated. The effects of the diameter of the die cavity and the impulsive pressure induced by explosion on the p...
Akihisa Mon, Kazuyuki Hokamoto, Masahiro Fujita
Materials Science Forum   465-466 307-312   Nov 2004
The characteristics of the new explosive welding technique using underwater shock wave developed by some of the authors are demonstrated based on the numerical simulation using AUTODYN. The welding method is effective in accelerating a thin metal ...
K. Raghukandan, K. Hokamoto, J. S. Lee, A. Mori
Materials Science Forum   465-466 201-206   Nov 2004
Aluminum based composites find immense potential in automobile, aeronautical and structural applications. Silicon carbide particulate reinforced aluminum composite (Al-SiC p ) was shock densified using axisymmetric assemblies for underwater explos...
Z. Q. Jin, Z. Q. Jin, C. Rockett, J. P. Liu, K. Hokamoto, N. M. Thadhani
Materials Science Forum   465-466 93-100   Nov 2004
Dynamic shock compaction offers the potential of fabricating bulk nanocrystalline functional materials via consolidation of amorphous or nanocrystalline alloy powders, while retaining the metastable structure and/or nanograin size of starting powd...
K. Hokamoto, J. S. Lee, A. Mori, S. Tanaka
Materials Science Forum   465-466 313-318   Nov 2004
The authors have been investigated the possibility for making bulk material without cracks through dynamic compaction of powders. The present paper intends to suggest the possibility for making large-sized sample for some Al-based composites. The ...
Kazuhito Fujiwara, Tetsuyuki Hiroe, Yasuhide Ohno, Kazuyuki Hokamoto, Tatsuya Nakao
Materials Science Forum   465-466 237-240   Nov 2004
The initiation of small amount of the explosive was performed by the wire explosion that is generated by the instant release of electric energy from capacitors, and the expected impulsive forces were obtained under the controlled condition. In ord...
Akio Kira, Daisuke Takaenoki, Hideki Hamashima, Ryuichi Tomoshige, Masahiro Fujita, Kazuyuki Hokamoto, Shigeru Itoh
Materials Science Forum   465-466 265-270   Nov 2004
A method to generate an extremely high impulsive pressure using a converging metal jet, has been developed as a purpose to achieve the high pressure above 1 TPa. The metal jet is discharged from the collision point, when a metal plate is accelerat...
H. Eskandari, K. Hokamoto, H. M. Ghasemi, M. Emamy, S. Borji, J. S. Lee
Materials Science Forum   465-466 433-438   Nov 2004
Aluminum matrix composites containing of 10, 20 and 30 vol% SiC particles were processed by direct and underwater explosive compaction methods. Optical microscopic examination hardness and bending strength measurements were carried out. It is obse...
K. Siva Kumar, K. Hokamoto, T. Balakrishna Bhat
Materials Science Forum   465-466 107-112   Nov 2004
2124 Al-SiCp composites have been compacted by axisymmetric and one-dimensional underwater shock consolidation. The thickness of explosive pad was up to 21.5 mm in axisymmetric explosive compaction and the thickness of water layer was up to 10 mm ...
Kazumasa Shiramoto, Akihisa Mori, Kazuyuki Hokamoto, Masahiro Fujita
Materials Science Forum   465-466 295-300   Nov 2004
The authors have proposed an explosive welding process using reflected underwater shock wave to accelerate a thin plate. In this process, an explosive attached on a surface of a steel block is set vertical to the specimen to be welded (a pair of a...
Kazuyuki Hokamoto, Yasuhiro Ujimoto, Masahiro Fujita
Materials Transactions   45 2897-2901   Sep 2004
A novel explosive welding technique which uses underwater shock waves to weld thin sheets and the technical advantages of this technique are reported. Using this technique, a thin metal plate is uniformly accelerated by underwater shock waves. The...
Y. Ujimoto, K. Hokamoto, J. S. Lee
Materials Science Forum   449-452 413-416   Jul 2004
This paper presents a new method of explosive welding using underwater shock waves. The method renders the possibility of accelerating a thin metal plate uniformly at a velocity above a few hundreds m/s to satisfy the explosive welding requirement...
K. Raghukandan, K. Hokamoto, P. Manikandan
Metals and Materials International   10 193-197   Apr 2004
Explosive cladding is best known for its capability to join a wide variety of both similar and dissimilar combinations of metals that cannot be joined by other conventional metal joining techniques. An attempt has been made to optimize the tensile...
K. Hokamoto, K. Raghukandan, J. S. Lee, M. Fujita, R. Tomoshige
Materials Science Forum   437-438 169-172   Nov 2003
Industrial pure aluminum powders (Al) reinforced with fine silicon carbide particles (SiC p ) were compacted using shock compression technique. The present investigation employed underwater shock waves generated from the detonation of a high explo...
Akira Chiba, Shinji Tanimura, Kazuyuki Hokamoto
International Journal of Impact Engineering   28 255   Mar 2003
K. Raghukandan, J. S. Lee, K. Hokamoto, A. Chiba, B. C. Pai
Journal of Materials Science Letters   21 1915-1916   Dec 2002
The successful consolidation of carbon fiber reinforced aluminum composites by shock consolidation was confirmed and found to result in the absence of aluminum carbide interaction products in the composites. It was shown that ball-mill mixing is p...
K. Hokamoto, M. Fujita
Physica B: Condensed Matter   239 187-190   Aug 1997
The history and current research activity in the High-Energy Rate Laboratory of Kumamoto University are introduced. The background and some unique research projects being promoted on shock waves in condensed matter are described in two areas in sh...
Ryuichi Tomoshige, Akio Kira, Masahiro Fujita, Kazuyuki Hokamoto, Yasuhiro Ujimoto, Akio Kato
Kayaku Gakkaishi/Journal of the Japan Explosives Society   63 257-263   Dec 2002
New experimental apparatus was developed for getting extremely high shock pressure. The apparatus utilized convergent collision of metal jets generated between a conical concave metal block and metal flyer plate. That is, since the plate is accele...
Kazuyuki Hokamoto, Yasuhiro Ujimoto, Shojiro Ohama, Mashiro Fujita
Kayaku Gakkaishi/Journal of the Japan Explosives Society   63 242-247   Dec 2002
A novel explosive welding technique using regulated underwater shock wave is developed and the possibility for the application is discussed. The assembly is used to accelerate a thin metal plate uniformly at a high velocity to satisfy the conditio...
Kazuyuki Hokamoto, Takafumi Tomoeda, Hironori Tsutsumi, Masahiro Fujita
Key Engineering Materials   233-236 199-204   Dec 2002
A novel method of dynamic compaction of super-hard powders was developed using converging underwater shock waves at elevated temperature, and the possibility of making polycrystalline diamond without binding agent and some other bulk compact of di...
K. Hokamoto, J. S. Lee, M. Fujita, S. Itoh, K. Raghukandan
Journal of Materials Science   37 4073-4078   Oct 2002
The possibility of synthesizing Ti 5 Si 3 from mixed elemental powders and the fabrication of its composites by explosive compaction is discussed. A new technique using underwater shock waves was developed and it was found to exercise better cont...
S. Itoh, H. Iyama, M. Fujita, K. Hokamoto, A. Kira
Kayaku Gakkaishi/Journal of the Japan Explosives Society   62 194-200   Jul 2001
The explosive welding method has been applied for the industrial production. Many dissimilar metals can be welded by this technique. However, it is difficult to weld very thin metal plate and amorphous film with other metal plate. In order to real...
K. Siva Kumar, K. Siva Kumar, K. Hokamoto
Journal of Materials Science   35 5823-5828   Dec 2000
2124 Al - 40 vol.% SiCp metal matrix composites have been consolidated by room temperature shock consolidation using axisymmetric assembly, and by one-dimensional hot shock consolidation using underwater shock wave assembly. Trimonite powder explo...
K. Hokamoto, S. Tanaka, M. Fujita, R. Zhang, T. Kodama, T. Awano, Y. Ujimoto
Journal of Materials Processing Technology   85 153-157   Jan 1999
A high-temperature shock compression system using converging underwater shock waves has been developed and the performance is under attempted improvement in the present investigation. A maximum temperature of 1100°C was obtained, and the use of PB...
K. Hokamoto, M. Fujita, H. Shimokawa, H. Shimokawa, H. Okugawa, H. Okugawa
Journal of Materials Processing Technology   85 175-179   Jan 1999
Thin aluminium plate was welded onto a zirconia ceramic by the use of a newly developed explosive welding technique. A 0.1 mm-thick aluminium plate was accelerated about 800 m s -1 by regulated underwater shock wave and collided with a zirconia p...
Minoru Mochihara, Kazuyuki Hokamoto, Masahiro Fujita
Metals and Materials International   4 911-914   Dec 1998
A shearing process of a metal plate by an impulsive pressure generated by underwater explosion was numerically simulated, and the analytical result was compared with some experimental results. The features of the deformation and the shearing proce...
Minoru Mochihara, Masahiro Fujita, Kazuyuki Hokamoto, Junichiroh Ueno, Shigeru Itoh
Kayaku Gakkaishi/Journal of the Japan Explosives Society   59 285-293   Nov 1998
The shearing deformation process in making a hole on a metal plate by an impulsive pressure driven by underwater explosion is experimentally and analytically analyzed. Two kinds of copper plates, work hardened plate through multi-layered explosive...
K. Hokamoto, H. Iyama, M. Fujita, T. Toyosato, N. N. Thadhani, S. Namjoshi
Review of High Pressure Science and Technology/Koatsuryoku No Kagaku To Gijutsu   7 924-926   Jan 1998
Using an explosive welding technique, aluminum plate was welded onto various metallic plates and the interfacial reaction phenomena are discussed. Normally, the interfacial zone showed a high-aluminum content phase which dissolved a small amount o...
Rui Zhang, Hirofumi Iyama, Masahiro Fujita, Tie Sheng Zhang, Shigeru Itoh, Kazuyuki Hokamoto
American Society of Mechanical Engineers, Pressure Vessels and Piping Division (Publication) PVP   331 207-211   Dec 1996
In this paper, the authors present a newly developed working method of manufacturing spherical shells without using presses and dies. The original experimental work dates back to (Frey,1967). The deformation process of a pre-welded multi-cone sphe...
K. Hokamoto, A. Chiba, M. Nishida, M. Fujita
Welding International   9 116-120   Jan 1995
Shigeru Itoh, Shiro Kubota, Shiro Nagano, Kazuyuki Hokamoto, Masahiro Fujita, Akira Chiba
Transactions of the Japan Society of Mechanical Engineers Series B   61 2981-2986   Jan 1995
A new shock consolidation technique applying converged underwater shock waves was proposed and tested for difficult-to-consolidate powders such as ceramics and cBN powders. We obtained bulks with fewer cracks than those obtained by other shock con...
Takeshi Izuma, Toru Niwatsukino, Kazuyuki Hokamoto, Masahiro Fujita
Explosively welded Al/Cu clad is tried to be fabricated inserting Cu intermediate plate between Al driver and Cu base plates. In explosively welded Al/Cu clad using conventional method, generation of excess reacted interfacial zone caused the degr...
T. Izuma, K. Hokamoto, M. Fujita, T. Niwatsukino
Welding International   8 618-622   Jan 1994
This paper describes efforts to fabricate explosively welded Al/Cu clad through insertion of a Cu intermediate plate between the Al driver and Cu base plates. In explosively welded Al/Cu clad fabricated by the conventional method, generation of an...
Kazuyuki Hokamoto, Akira Chiba, Minoru Nishida, Masahiro Fujita
Multilayered composites reinforced with steel sheets were tried to be fabricated using single-shot explosive welding technique. The experimental conditions for obtaining moderate bonding at every interface were investigated based on collision velo...
K. Hokamoto, T. Izuma, M. Fujita
Metallurgical Transactions A   24 2289-2297   Jan 1993
Various aluminum alloys and stainless steel were explosively welded using a thin stainless steel intermediate plate inserted between the aluminum alloy driver and stainless steel base plates. At first, the velocity change of the driver plate with ...
Takeshi Izuma, Kazuyuki Hokamoto, Masahiro Fujita, Munenori Aoyagi
Transactions of the Japan Welding Society   23 46-51   Apr 1992
JIS A5083/SUS304 is known as a very difficult combination to weld by an explosive welding technique. This combination is explosively welded in trial using thin SUS304 intermediate plate. The formation of thick interfacial zone at welded interface ...
T. Izuma, K. Hokamoto, M. Fujita, M. Aoyagi
Welding International   6 941-946   Jan 1992
Kazuyuki Hokamoto, Masahiro Fujita, Akira Chiba, Li Qun Ruan, Susumu Uragami
Kogyo kayaku   50 156-161   Dec 1989
The authors analyzed multilayered explosive bonding parameters by using the finite differential method. Uniform wave structures from explosive to anvil side are obtained by regulating the following experimental conditions. (1) Place the multilayer...
Akira Chiba, Kazuyuki Hokamoto, Minoru Nishida
Nippon Kinzoku Gakkai-si   53 1268-1275   Dec 1989
Multilayered aluminum and titanium base composite reinforced with 18%Ni maraging steel sheets were fabricated by the single-shot explosive welding technique. Microstructures and tensile strength were examined. The effect of heat treatment on the t...
Kazuyuki Hokamoto, Liqun Ruan, Susumu Uragami, Masahiro Fujita, Akira Chiba
Memoirs of the Faculty of Engineering, Kumamoto University   33    Oct 1988
The authors propose a method of numerical analysis of the change in the acting gas pressure and the velocity of a plate accelerated by detonating gas pressure. They then confirm the validity of this analysis by experimental measurements of the cha...

Books etc

Explosive compaction of powders and composites
Shock Waves in Materials Science
HOKAMOTO Kazuyuki (Part:Contributor, The Role of Thermal Energy in Shock Consolidation)
Springer Verlag   1993   

Conference Activities & Talks

田中茂, 川路直樹, 和田直之, 外本和幸
火薬学会年会講演要旨集   25 May 2017   
西田政弘, 児玉史哉, 石田魁人, 林浩一, 赤星保浩, 外本和幸, 眞山剛, 山崎倫昭, 河村能人
宇宙航空研究開発機構特別資料 JAXA-SP-(Web)   27 Mar 2017   
佐藤義晃, 結城和久, 長野慎太朗, 木伏理沙子, 海野徳幸, 外本和幸, 田中茂, 富村寿夫
日本伝熱シンポジウム講演論文集(CD-ROM)   2017   
西田政弘, 児玉史哉, 林浩一, 赤星保浩, 外本和幸, 眞山剛, 山崎倫昭, 河村能人
衝撃波シンポジウム講演論文集(CD-ROM)   2017   
児玉史哉, 西田政弘, 石田魁人, 林浩一, 赤星保浩, 外本和幸, 眞山剛, 山崎倫昭, 河村能人
日本機械学会M&amp;M材料力学カンファレンス(CD-ROM)   7 Oct 2016   
森昭寿, 李明東, 田中茂, 外本和幸
塑性加工連合講演会講演論文集   30 Sep 2016   
田中茂, 外本和幸
塑性加工連合講演会講演論文集   30 Sep 2016   
森昭寿, 田中茂, 外本和幸
日本機械学会年次大会講演論文集(CD-ROM)   10 Sep 2016   
外本和幸, 岡司真, 福田淳史
日本機械学会年次大会講演論文集(CD-ROM)   10 Sep 2016   
森昭寿, 大谷尚生, 高橋大輔, 外本和幸
塑性加工春季講演会講演論文集   28 Apr 2016   
前原弘法, 外本和幸
衝撃波シンポジウム講演論文集(CD-ROM)   2016   
西田政弘, 石田魁人, 林浩一, 赤星保浩, 外本和幸, 眞山剛, 山崎倫昭, 河村能人
衝撃波シンポジウム講演論文集(CD-ROM)   2016   
濱嶋英樹, 鶴井明彦, 外本和幸
衝撃波シンポジウム講演論文集(CD-ROM)   2016   
田中茂, 外本和幸
衝撃波シンポジウム講演論文集(CD-ROM)   2016   
比嘉修, 安田淳, 藏屋英介, 比嘉吉一, 外本和幸, 伊東繁
衝撃波シンポジウム講演論文集(CD-ROM)   2016   
結城和久, 佐藤義晃, 鈴木康一, 富村寿夫, 外本和幸
日本伝熱シンポジウム講演論文集(CD-ROM)   2016   
田中茂, 稲尾大介, 森昭寿, 外本和幸
日本機械学会機械材料・材料加工技術講演会論文集(CD-ROM)   2016   
森昭寿, 田中茂, 吉良章夫, 外本和幸
衝撃波シンポジウム講演論文集(CD-ROM)   2016   
ISHIDA Kaito, NISHIDA Masahiro, HAYASHI Koichi, AKAHOSHI Yasuhiro, HOKAMOTO Kazuyuki, KAWAMURA Yoshihito
M&M材料力学カンファレンス   21 Nov 2015   
Ejecta size of a LPSO-type magnesium alloy were examined when aluminum alloy projectiles struck in hypervelocity. The size of ejecta collected from the test chamber was measured. We compared with the difference in ejecta size distribution by chang...