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首页> 外文期刊>Materials Science Research International >The High Strain Rate Dynamic Stress-Strain Curve for OFHC Copper
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The High Strain Rate Dynamic Stress-Strain Curve for OFHC Copper

机译：OFHC铜的高应变速率动应力-应变曲线

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摘要

The high strain rate (～10~4/s) mechanical properties of a 152 μm grain size OFHC copper were determined from the analysis of ballistic test specimens subjected to the Taylor Test. Deformation was analyzed by two independent techniques, one an analytical method and the second a finite element numerical model. The results from these complementary analyses were combined to construct a high strain rate dynamic stress-strain curve for this OFHC copper. This dynamic stress-strain curve is then compared with conventional quasi-static mechanical test data. When deformed at these high strain rates, the OFHC copper exhibits an increase in the yield strength, the strain-hardening rate and the ultimate dynamic strength relative to their conventional quasi-static values. The OFHC copper results are then compared with high strain rate measurements for high purity 1100 aluminum. This reveals distinct differences of the high strain rate deformation of these two metals. It is suggested that the differences may relate to the ability of the OFHC copper to deform by twinning, whereas the aluminum does not exhibit a twinning mode of deformation.
机译：152微米晶粒度的OFHC铜的高应变速率（〜10〜4 / s）力学性能是通过对经受泰勒测试的弹道试样进行分析而确定的。通过两种独立的技术来分析变形，一种是分析方法，第二种是有限元数值模型。这些互补分析的结果结合在一起，为该OFHC铜构建了高应变率动态应力-应变曲线。然后将该动态应力-应变曲线与常规的准静态机械测试数据进行比较。当在这些高应变速率下变形时，相对于它们的常规准静态值，OFHC铜的屈服强度，应变硬化速率和极限动态强度都有所提高。然后将OFHC铜的结果与高纯度1100铝的高应变率测量结果进行比较。这揭示了这两种金属的高应变率变形的明显差异。建议的差异可能与OFHC铜通过孪生变形的能力有关，而铝不表现出孪生变形模式。

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