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Dynamic Deformation Behaviors of High Performance Steels

机译:高性能钢的动态变形行为

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The responses of three high strength steels under impact loading were examined, specifically on their strain rate dependence. Split Hopkinson pressure bar test was used in this study. Over a wide strain rate range, the Johnson-Cook model and modified Johnson-Cook mode were adopted to determine the strain rate hardening behavior of the materials. The group determined the material parameters for each metallic material tested. Obtained material parameters were used to predict the behavior of each steel at high strain rate region. The modified Johnson-Cook model was not able to represent well enough the plastic deformation behavior of steels, specifically the steel that exhibited strain softening behavior at high strain rate region.
机译:研究了三种高强度钢的冲击载荷响应,特别是在其应变率依赖性上。 本研究中使用了分裂霍普金森压力棒试验。 在宽的应变速率范围内,采用了约翰逊烹饪模型和改进的约翰逊烹饪模式来确定材料的应变率硬化行为。 该组确定测试每个金属材料的材料参数。 获得的材料参数用于预测高应变率区域的每根钢的行为。 改进的Johnson-Cook模型无法表示足够的钢的塑性变形行为,特别是在高应变率区域表现出应变软化行为的钢。

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