在考虑材料参数、裂纹长度、外载分散性的前提下,本文用Taylor展开随机有限元方法分析了平面多裂纹应力强度因子分散性。给出了在各随机因素影响下的应力强度因子均值和方差的计算公式,并用一般六节点单元和六节点奇异等参单元建立了平面多裂纹的随机有限元模型。算例结果显示:裂纹间距对各应力强度因子的分散性影响比较明显,同时材料弹性模量、外载、裂纹长度的分散性对应力强度因子的分散性影响比较显著,而材料泊松比影响很小。
Taylor stochastic finite element method (SFEM) is applied to analyze the uncertainty of plane multiple cracks stress intensity factors (SIFs) considering the uncertainties of material properties, crack length, and load. The stochastic finite element model of plane multiple cracks are presented. In this model, crack tips are meshed with six-node triangular quarter-point elements; and other area is meshed with six-node triangular elements. The partial derivatives of displacement and stiffness matrix with resp...