圆柱壳开孔补强的弹性和弹塑性有限元分析

考虑补强圈与圆柱壳作为一个整体子模型和接触子模型，对开孔补强结构的圆柱壳进行了弹性和弹塑性有限元应力分析。比较两个子模型和弹性／弹塑性有限元分析的结果，发现接触子模型和整体子模型的圆柱壳开孔应力分布相似，但接触子模型和整体子模型在壳体和补强圈之间的接触面上的应力分布存在差异。对不同直径的接管和不同倾角的接管进行了有限元分析，分析表明，应力分布及最大应力受倾角的影响较大，受直径变化的影响不大。

Elastic and Elastoplastic Analysis for Pad Reinforcement of Pressure Vessel

Stress analysis for opening reinforcement structures of a cylindrical shell was performed by elastic and elastoplastic FEM. Two models, an integrative sub - model and a contact sub - model, for reinforcement pad and the cylindrical shell were adopted. The results of elastic/elastoplastic FE analysis show that the stress distribution of cylindrical shell intersections by the contact model is similar to that by the integrative model, but there are some differences of the stress at contact surfaces of the shell and the reinforcement pad. Finite ele- ment analyses for different nozzle diameters and different oblique angles in nozzle and cylinder shell intersections were carried out. The stress distribution and the maximum stress are affected evidently by oblique angle, but there is only small difference in the maximum stress intensity among different diameters.