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有限单元法的解题步骤是:把连续结构离散成单元的集合体,单元之间通过节点相互连系;先作单元分析,得到节点力和节点位移之间的关系式;再作总体分析,即按节点平衡条件得到以节点位移为未知量的有限元方程组;考虑约束条件,解方程组得到节点位移,进一步求得单元应力和内力。在有限元方程组形成过程中必须输入一些数据,如单元编号,单元定义(即单元节点号),节点坐标
The problem-solving step of the finite element method is to discrete the continuous structure into a set of elements, and the elements are interconnected by nodes; first, the element analysis is performed to obtain the relationship between nodal forces and nodal displacements; then the overall analysis is performed. That is, according to the node equilibrium condition, the finite element equation group with unknown node displacement is obtained; considering the constraint condition, the solution equation group obtains the node displacement, and the unit stress and internal force are further obtained. Some data must be entered during the formation of finite element equations, such as unit number, unit definition (ie, unit node number), and node coordinates.