TC4合金绝热剪切动态演变过程数值模拟研究

Simulation of Adiabatic Shearing Behavior of TC4 Alloy during Dynamic Loading

摘要:

对TC4合金强迫剪切过程进行了数值模拟，获得了绝热剪切过程中变形局域化区域内的von-Mises应力、有效塑性应变以及温度的分布规律。通过分析发现：大量应变集中于帽形试样变形局域化区域内，且在试样两拐角处最大；变形局域化区域内温度明显高于基体温度，且在试样两拐角处最高。结果表明，绝热剪切带内温度达到了TC4合金的再结晶温度，这为TC4合金绝热剪切带内微观组织变形机制的研究提供了依据

Abstract:

The adiabatic shearing behavior of TC4 alloy was simulated using LS-DYNA, and the distribution of equivalent strain, von-Mises stress and temperature rise in the hat-shaped specimen during dynamic loading were obtained. It is found that a large part of plastic strain is concentrated in a narrow deformation area. The temperatures in this area are much higher than those of the matrix material. The equivalent strain, von-Mises stress and temperature rise in each corner of the hat-shaped specimen are highest during all the loading processes. The simulation indicates that the maximum temperature in adiabatic shear band is higher than the recrystallization temperature of TC4 alloy, but lower than its phase transformation temperature, which is helpful to the research of the microstructure deformation mechanism of adiabatic shear band of TC4 alloy.