解释动态硬度:分离速度、应变率和冲击的作用

Y. Mao, B. Barnett, K. Prasad, A. Vivek, G. Daehn
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引用次数: 0

摘要

机械硬度通常定义为力除以压痕面积。硬度(动态)有时是根据被位移体积归一化的吸收压痕能量来定义的。这项初步研究使用标准定义比较静态和动态硬度。硬度通常随应变速率的增加而增加,这通常被解释为由位错阻力等机制引起的应变速率硬化。这种分析考虑了最简单的情况-弹塑性材料的无速率依赖的弹道压痕。欧拉-拉格朗日耦合力学(CEL)和光滑颗粒流体力学(SPH)结果表明,压头冲击速度与动态硬度呈线性相关。外推到0米/秒的冲击速度收敛到静态硬度。这两种方法都不能证明压头大小的依赖性。高冲击速度也会带来冲击。速度和冲击硬化效应可以解释动态硬度随压头速度的增加而增加而没有应变率硬化的原因。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Interpreting Dynamic Hardness: Separating Roles of Speed, Strain Rate and Shock
Mechanical hardness is classically defined as force divided by indented area. Hardness (dynamic) is alternately sometimes defined based on indentation energy absorbed normalized by displaced volume. This elementary study compares static and dynamic hardness using standard definitions. Hardness is often observed to increase with strain rate and this is commonly interpreted as strain-rate hardening by mechanisms such as dislocation drag. This analysis considers the simplest situation – ballistic indentation of an elastic-perfectly plastic material without rate dependence. Results from both Coupled Eulerian-Lagrangian (CEL) and Smoothed Particle Hydrodynamics (SPH) show a linear correlation between indenter impact speed and dynamic hardness. Extrapolating to an impact speed of 0 m/s converges to static hardness. Neither approach demonstrates indenter size dependence. High impact speeds also can introduce shock. It is suggested that speed and shock hardening effects can account for the increase in dynamic hardness with increased indenter speed without strain-rate-hardening.
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