Dynamic Strength of Copper at High Pressures Using Pressure Shear Plate Experiments
Dynamic Strength of Copper at High Pressures Using Pressure Shear Plate Experiments
复制标题
使用压力剪切板实验研究高压下铜的动态强度
DOI：
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发表时间：
2021
影响因子：
1.7
通讯作者：
G. Ravichandran
中科院分区：
文献类型：
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作者：
S. Ravindran;Vatsa Gandhi;Z. Lovinger;M. Mello;G. Ravichandran
高压下的强度测量对于了解材料在极端载荷条件下的行为至关重要。最近的发展已经将压力剪切板冲击(PSPI)技术扩展到高压区域。这样的实验提供了一个独特的机会来提取材料在相对较高压力下的完整应力-应变行为。改进的技术包括一种新的光纤外差横向速度干涉仪系统和新的分析方法，以解释砧板的非弹性响应。在这项研究中，无氧高电导率铜在10~43 Gpa的压力和 ~ 10 5 S−1的应变率下进行了PSPI实验。采用基于数值模拟和实验中收集的粒子速度记录的混合方法获得了铜的完整的应力-应变曲线。在相似的压力和应变速率下，使用两种承受不同水平塑性应变的锤子进行实验：工具钢和碳化钨，以检查混合方法的健壮性。将铜在这些高压和应变速率下的行为与以前的文献数据进行了比较，并讨论了压力和应变速率对铜强度行为的影响。结果表明，屈服强度随压力的变化率是剪切模数随压力变化率的2.5倍。对预测铜在这些极端条件下的响应的强度模型也进行了检验和验证。
Measurement of strength at high pressures is critical to understanding the behavior of materials subjected to extreme loading conditions. Recent developments have extended the pressure shear plate impact (PSPI) technique to the high-pressure regime. Such experiments provide a unique opportunity to extract the complete stress–strain behavior of materials at relatively high pressures. The modified technique includes a new fiber-optic heterodyne transverse velocity interferometer system and new analysis methods to account for the inelastic response of the anvil plates. In this study, PSPI experiments are conducted on oxygen-free high conductivity (OFHC) copper at pressures ranging from 10 to 43 GPa and at strain rates of ~ 105 s−1. Complete stress–strain curves of copper are obtained using a hybrid methodology that relies on numerical simulations and particle velocity records gathered in these experiments. Experiments are conducted at similar pressures and strain rates using two types of anvils that undergo different levels of plastic strains: tool steel and tungsten carbide, to check the robustness of the hybrid method. The behavior of copper at these high pressures and strain rates is compared with previous literature data, and the effect of pressure and strain rate on the strength behavior of copper are discussed. It was observed that the rate of change in yield strength with pressure was 2.5 times the rate of change of shear modulus with pressure. The strength models that predict the response of copper at these extreme conditions are also examined and validated.