铝合金材料激光冲击喷丸力学响应有限元建模

Finite Element Modeling of Mechanical Response of Aluminum Alloy Materials by Laser Shock Peening

为研究激光冲击喷丸工艺中材料动态力学特性及残余应力分布规律,基于ABAQUS软件开展了铝合金材料2024–T351激光冲击喷丸有限元建模及数值模拟研究。使用PVDF压电传感器测量了激光冲击力时空分布数据,建立激光冲击喷丸动态压力模型;通过轻气炮一维平板撞击试验验证了超高应变率下的铝合金2024–T351力学本构模型;基于VDLOAD子程序实现复杂工艺路径加载,获得激光冲击过程中纳秒尺度力学响应特性。进行了激光冲击喷丸有限元模拟,分析残余应力在材料内部的分布规律,进行了钻孔法测量表面残余应力试验,验证了残余应力预测的准确性,从而验证了所建立的激光冲击喷丸有限元模型的准确性。

In order to study the dynamic mechanical properties and residual stress distribution of laser shock peening,the finite element modeling and numerical simulation of 2024–T351 laser shock peening were carried out based on ABAQUS software.The PVDF piezoelectric sensor was used to measure the spatiotemporal distribution data of laser impact force,and the dynamic pressure model of laser shock peening was established.The one-dimensional plate impact test of light-gas gun was used to verify the mechanical constitutive model of aluminum alloy 2024–T351 under ultra-high strain rate.The complex process path loading was realized based on the VDLOAD subroutine,and the nanosecond scale mechanical response characteristics during laser shock were obtained.The finite element simulation of laser shock peening was conducted,and the distribution law of residual stress in the material was analyzed.The surface residual stress test had been proceeded by drilling method.The accuracy of residual stress prediction was proven,which verified the accuracy of the established laser shock peening finite element model.