High strain rate deformation in FCC metals and alloys
High strain rate deformation in FCC metals and alloys
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发表时间：
1985
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通讯作者：
P. Follansbee
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作者：
P. Follansbee
应变率，特别是高应变率对材料变形机制的影响，对于那些模拟和分析动态加载的人来说是非常重要的。在许多材料中，当应变率提高到约10/sup 3/S/sup-1/以上时，应变速率敏感性会急剧增加。这种增加以前被解释为变形机制从低应变速率下的热激活控制向高应变速率下的位错阻力控制转变。在铜、铜铝合金和不锈钢中，最近的测量表明，在高应变速率下发现的速率敏感性的增加不是由于变形机制的转变，而是可以用标准的热激活理论来解释。这些发现及其对构成行为的形成的启示被提出。
The effect of strain rate, and particularly of high strain rates, on deformation mechanisms in materials is of fundamental interest to those who model and analyze dynamic loading. In many materials the strain rate sensitivity is known to increase dramatically when the strain rate is raised above approx.10/sup 3/ s/sup -1/. This increase has been interpreted previously as a transmission in deformation mechanism from thermal activation control at low strain rate to dislocation drag control at high strain rate. In copper, copper-aluminum alloys and stainless steel, recent measurements have shown that the increased rate sensitivity found at high strain rates is not due to a transition in deformation mechanism but rather can be explained with standard thermal activation theory. These findings and their implications regarding the formulation of constitutive behavior are presented.