【摘要】 建立了激光辐照下充压旋转柱壳热力学响应的物理模型和数值计算模型,求解了激光产生的非线性温度场。在此基础上,考虑塑性和屈服强度的温度相关性,求解了非线性的应力场,分析了柱壳裂纹萌生的可能位置和条件。通过计算发现,旋转充压柱壳在过光斑中心外表面圆周上有最大应力值这说明在过光斑中心的外表面环带区域将有可能最先发生破坏。激光辐照薄壁柱壳时有较高的温升其更容易发生破坏;旋转柱壳在过光斑中心圆周上应力分布随旋转频率增加而趋于均匀这是因为旋转频率增加激光辐照的环带区域温度分布更加均匀;在激光总能量相同条件下,小光斑辐照时易产生裂纹。更多还原

【Abstract】 The failure processes of rotating cylindrical shells subjected to inner pressure and surface laser irradiation are studied here.The physics model and numerical solution model of thermal and mechanical responding is described.The finite element method is used to simulate nonlinear temperature and stress profile.It is analyzed by numerical simulation that the fracture occurred simultaneously at the whole outer cycle through the beam center of the rotational cylinder shell.It is also concluded that the stress distributes more uniformly with the rotating frequency increasing and that the smaller beam spot will easily crack at the condition of the same total laser energy.更多还原