The Mechanism of Critical Strain of Serrated Yielding in Strain Rate Domain

The Mechanism of Critical Strain of Serrated Yielding in Strain Rate Domain
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应变率域锯齿屈服临界应变机理

DOI:
10.1088/0256-307x/33/2/026201
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发表时间:
2016-02
影响因子:
3.5
通讯作者:
Wu Xiao-Ping
Wu Xiao-Ping
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
Fu Shi-Hua;Cai Yu-Long;Yang Su-Li;Zhang Qing-Chuan;Wu Xiao-Ping

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通过不同应变率下的拉伸试验,研究了锯齿屈服临界应变的机理。在临界应变之前,位错在高应变率下不被钉扎,而在低应变率下被钉扎但不能逃逸。临界应变取决于在高应变速率下的第一钉扎过程和在低应变速率下的第一解除钉扎过程。基于这两个准则的计算结果与实验结果吻合较好。
The mechanism of the critical strain of serrated yielding is studied via tension tests at various strain rates. Before the critical strain, it is deduced that dislocations are not pinned at high strain rates, and dislocations at low strain rates are pinned but cannot escape. The critical strain depends on the first pinning process at high strain rates and on the first unpinning process at low strain rates. The calculated results based on the two criteria are in good consistency with the experiment.
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