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有限元技术有两个内容:一个是把连续体分成许多离散元素,第二是在这些离散元素的联结点上假设一些条件。我们把这些联结点称之为接点或节点。有限元技术之所以大量使用,很大程度是由于高性能数字计算机的发展。种类繁多的有限元软件可从各个渠道取得。这些软件中大多数用的是刚度法而不是挠度法。刚度法用的静力分析矩阵方程可写成:{F}=[K]{X}(1)式中:{F}=力矢量列阵.[K]=刚度方阵.{X}=位移矢量列阵若设{X}=1,刚度矩阵就表示引起单位位移的力。
The finite element technique has two contents: one is to divide the continuum into many discrete elements, and the second is to assume some conditions on the joint points of these discrete elements. We call these junctions junctions or nodes. The reason why the use of finite element technology in large quantities is largely due to the development of high-performance digital computers. A wide variety of finite element software is available from all sources. Most of these software use stiffness rather than deflection. The static analysis matrix equation for the stiffness method can be written as: {F} = [K]{X} (1) where: {F} = force vector matrix. [K] = stiffness square matrix. {X} = displacement If {X}=1 in the vector array, the stiffness matrix represents the force that causes unit displacement.