基于冯·米塞斯屈服准则和弹塑性本构关系，建立了长脉冲激光辐照7A04铝合金的空间轴对称有限元模型，并利用有限元有限差分混合算法计算了光强为高斯分布的激光光束加热铝合金板时的温度场和热应力场。研究发现目标上表面米塞斯应力主要分布在中心点周围，离中心点相对较远位置处的米塞斯应力很小，对目标几乎不起破坏作用，并且米塞斯等效应力远小于铝合金目标的屈服强度。仿真计算结果与实验结果的一致性证实了该模型的有效性。

Based on the von Mises yield criterion and the elastoplastic constitutive relation, a spatial axisymmetric finite element model is established for long pulsed laser irradiating 7A04 aluminium alloys, and the temperature field and the thermal stress field are calculated by the finite-element/finite-difference hybrid algorithm when the laser beam with a Gaussian intensity profile heating the aluminium alloy plate. It is found that the Mises stress on the target surface distributes mainly within a certain scope around the center. At a position far from the center, the Mises stress is very small which barely affects the target and the Mises equivalent stress is far less than the yield strength of the aluminum alloy target. The consistency between the simulation and experimental results confirms the validity of the model.