与绝热剪切带相关的温度升高：因果关系得以阐明。

Temperature Rise Associated with Adiabatic Shear Band: Causality Clarified.

作者信息

Guo Yazhou, Ruan Qichao, Zhu Shengxin, Wei Q, Chen Haosen, Lu Jianan, Hu Bo, Wu Xihui, Li Yulong, Fang Daining

机构信息

School of Aeronautics, Northwestern Polytechnical University, Xi'an 710072, China.

Shaanxi Key Laboratory of Impact Dynamics and Engineering Application, Northwestern Polytechnical University, Xi'an 710072, China.

出版信息

Phys Rev Lett. 2019 Jan 11;122(1):015503. doi: 10.1103/PhysRevLett.122.015503.

DOI:10.1103/PhysRevLett.122.015503

PMID:31012723

Abstract

One of the most important issues related to adiabatic shear failure is the correlation among temperature elevation, adiabatic shear band (ASB) formation and the loss of load capacity of the material. Our experimental results show direct evidence that ASB forms several microseconds after stress collapse and temperature rise reaches its maximum about 30 μs after ASB formation. This observation indicates that temperature rise cannot be the cause of ASB. Rather, it might be the result of adiabatic shear localization. As such, the traditional well-accepted thermal-softening mechanism of ASB needs to be reconsidered.

摘要

与绝热剪切失效相关的最重要问题之一是温度升高、绝热剪切带（ASB）形成与材料承载能力损失之间的相关性。我们的实验结果提供了直接证据，表明ASB在应力崩溃后几微秒形成，而温度升高在ASB形成后约30微秒达到最大值。这一观察结果表明，温度升高不是ASB形成的原因。相反，它可能是绝热剪切局部化的结果。因此，传统上被广泛接受的ASB热软化机制需要重新考虑。