一、基本原理线性弹性体的有限单元分析在理论上是完善的,在应用上也最成熟。而非线性问题的有限单元分析总是根据非线性的应力应变关系逐段地化为一系列线性问题用迭代法求解,因此线性分析是非线性分析的基础。线性弹性问题的有限元分析采用位移法主要分三步进行:(1)实际结构的离散化;(2) First, the basic principle The finite element analysis of the linear elastic body is perfect in theory, and is also the most mature in application. The finite element analysis of nonlinear problems is always based on the nonlinear stress-strain relationship to solve a series of linear problems with an iterative method. Therefore, linear analysis is the basis of nonlinear analysis. The finite element analysis of the linear elasticity problem is mainly performed in three steps using the displacement method: (1) Discretization of the actual structure; (2)