加肋轴对称组合壳塑性极限分析 专用软件LAFEMAT的研制

摘要

基于轴对称截锥壳单元,建立了加肋轴对称组合壳塑性极限分析的有限元计算方法；应用Fortran语言编制了LAFEMAT专用软件.该软件通过分步加载,计算每一载荷步作用下组合壳单元的应力状态,采用一系列弹性计算方法模拟弹-塑性计算,直至组合壳达到极限状态,从而求得极限载荷.实例证明:该专用软件具有较高的计算效率和精度.%Based on axisymmetric truncated conical shell element, the finite element method was pro posed for plastic limit analysis of ring-stiffened axisymmetric combination shell and software LAFE MAT was developed by using Fortran. By loading the combination shell step by step, an analysis was made of the stress state of the combination shell under each load step. The elastic-plastic analysis was simulated by a series of elastic calculations. At the limit state, the plastic limit load was then deter mined. The example demonstrates the high efficiency and accuracy of the software.