3. The angle-face,edge-face,and face-face contact model are discussed in detail and the contact submatrices are derived by vector analytical and penalty function method.
3.重点讨论了三维块体的角一面、边一面和面一面接触模型,并用矢量方法和罚函数法进行了详细的理论推导,给出了接触子矩阵的表达式。
参考来源 - 三维非连续变形分析方法的研究·2,447,543篇论文数据，部分数据来源于NoteExpress
The formulas to calculate the variance of a quadratic form with the matrix composed of submatrices are given in this paper.
给出了由子矩阵组成的分块矩阵时，随机变量二次型的方差、协方差的计算公式。
It is proved that the stiffness matrix of the finite element solution is a block diagonal matrix and its elements are some symmetric and block circulant submatrices.
证明了有限元求解的刚度矩阵是一个块对角阵，且其子矩阵是某种对称、块循环矩阵。
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