45钢动态塑性本构参量与验证

Investigation and validation on plastic constitutive parameters of 45 steel

1.
Institute of Structural Mechanics, China Academy of Engineering Physics, Mianyang 621900, Sichuan, China

摘要: 运用静态实验机和SHPB装置，对45钢在常温～750C、应变率为10-4～103 s-1下的力学行为进行了研究，拟合得到了Johnson-Cook本构模型参量。开展了Taylor圆柱撞击的火炮实验，运用LS-DYNA进行了相应的数值模拟，通过二者的比较对本构模型参量进行了验证，表明所得模型参量可以较好地描述材料在高速变形下的大应变力学行为。
- 固体力学 /
- 塑性本构参量 /
- Taylor实验 /
- 45钢 /
- SHPB
Abstract: Dynamic mechanical behaviors of 45 steel have been studied with the split Hopkinson pressure bar(SHPB) and static material test system over a wide range of strain rates and temperatures. The Johnson-Cook constitutive relationship parameters are determined through these experiments. The parameters are validated by comparison between the Taylor experiments and the simulations. The consistency between experimental observation and numerical simulation indicates that the parameters obtained can describe the large strain mechanical behavior of 45 steel under high speed deformation.
- solid mechanics /
- dynamic plastic constitutive parameter /
- Taylor impact /
- 45 steel /
- SHPB