2017年6月1日
Dynamic fracture of tantalum under extreme tensile stress
Science Advances
- 巻
- 3
- 号
- 6
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1126/sciadv.1602705
- 出版者・発行元
- American Association for the Advancement of Science
The understanding of fracture phenomena of a material at extremely high strain rates is a key issue for a wide variety of scientific research ranging from applied science and technological developments to fundamental science such as laser-matter interaction and geology. Despite its interest, its study relies on a fine multiscale description, in between the atomic scale and macroscopic processes, so far only achievable by large-scale atomic simulations. Direct ultrafast real-time monitoring of dynamic fracture (spallation) at the atomic lattice scale with picosecond time resolution was beyond the reach of experimental techniques. We show that the coupling between a high-power optical laser pump pulse and a femtosecond x-ray probe pulse generated by an x-ray free electron laser allows detection of the lattice dynamics in a tantalum foil at an ultrahigh strain rate of e ~2 × 108 to 3.5 × 108 s−1. A maximal density drop of 8 to 10%, associated with the onset of spallation at a spall strength of ~17 GPa, was directly measured using x-ray diffraction. The experimental results of density evolution agree well with large-scale atomistic simulations of shock wave propagation and fracture of the sample. Our experimental technique opens a new pathway to the investigation of ultrahigh strain-rate phenomena in materials at the atomic scale, including high-speed crack dynamics and stress-induced solid-solid phase transitions.
- リンク情報
-
- DOI
- https://doi.org/10.1126/sciadv.1602705
- PubMed
- https://www.ncbi.nlm.nih.gov/pubmed/28630909
- Scopus
- https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85033801127&origin=inward 本文へのリンクあり
- Scopus Citedby
- https://www.scopus.com/inward/citedby.uri?partnerID=HzOxMe3b&scp=85033801127&origin=inward
- ID情報
-
- DOI : 10.1126/sciadv.1602705
- ISSN : 2375-2548
- eISSN : 2375-2548
- ORCIDのPut Code : 77915435
- PubMed ID : 28630909
- SCOPUS ID : 85033801127