关于构造单元刚度矩阵的“自由列式”方法

On the Free Formation of Constructing Stiffness Matrices

[1]中提出的单片检验IET(Individual Element Test)用于构造有限元的单元刚度矩阵.随后,此方法逐步改进,又有了构造单元刚度矩阵的“自由列式”方法.此公式将单元刚度矩阵对应常应变部分与高阶模态分别构造,没有交叉项,常应变部分是恒不变的.

This paper discusses the mathematical foundation of the free formation ofconstructing stiffness matrices, proposed recently by Bergan et al. It is proved thatthe free formation is actually equivalent to a special kind of nonconformingelements.