Abstract

The influence of strength–differential (SD) effect has been investigated on Johnson–Cook (JC) material model parameters for armor grade RHA steel. Two set of JC model parameters has been developed with the help of compressive and tensile flow curve. Further, a finite element analysis (FEA) of static (at 10⁻³ s⁻¹) and dynamic indentation (at 10⁴ s⁻¹) has been performed to validate the effect of tensile and compressive JC material model parameters. In addition, static and dynamic indentation FEA results has been compared with the expanding cavity model (ECM) and experimental Split–Hopkinson pressure bar results, respectively. FEA simulation with compressive data has been shown good agreement with experimental results and analytical models. %SD effect is increased with an increase in plastic strain in armor grade RHA steel.

摘要

强度差 (SD) 效应对装甲级 RHA 钢的 Johnson-Cook (JC) 材料模型参数的影响进行了研究。借助压缩和拉伸流动曲线，开发了两组 JC 模型参数。^{此外，静态（在 10 -3}  s ^-1时）和动态压痕（在 10 ⁴  s ^-1时）的有限元分析 (FEA)) 已用于验证拉伸和压缩 JC 材料模型参数的影响。此外，静态和动态压痕 FEA 结果已分别与膨胀腔模型 (ECM) 和实验 Split-Hopkinson 压力棒结果进行了比较。使用压缩数据的 FEA 模拟与实验结果和分析模型非常吻合。%SD 效应随着装甲级 RHA 钢中塑性应变的增加而增加。