Abstract:Stress intensity factors (SIFs) are important parameters in predicting the initiation and propagation of cracks in structures subjected to loads. The semi-analytical scaled boundary finite element method (SBFEM) combines the advantages of finite element and boundary element method, and without local mesh refinement around crack tips or regions existing stress singularities. The stress intensity factors can be directly extracted. Within the framework of the scaled boundary finite element method in evaluating stress intensity factors, random parameters are introduced for Monte Carlo simulation (MCs), a novel uncertainty quantification (UQ) analysis based on Monte Carlo simulation is proposed in this manuscript. Unlike direct Monte Carlo simulation, singular value decomposition (SVD) is used to construct lower order subspaces to reduce the degree of freedom of the system. Radial basis function (RBF) is used to approximate the subspaces and obtain new structural responses through linear combinations of subspaces, achieving fast uncertainty quantification analysis based on MCs. Considering the effects of structural shape parameters and material property parameters on stress intensity factors under different load conditions, an improved Monte Carlo simulation is used to calculate the statistical characteristics of stress intensity factors and quantify the impact of uncertain parameters on the structure. Finally, the accuracy and effectiveness of the algorithm proposed in this paper are verified by several examples.
胡昊文1,2,陈灯红1,2,王乾峰1,2,胡记磊1,2,骆欢1,2. 基于比例边界有限元法计算应力强度因子的不确定量化分析[J]. 振动与冲击, 2024, 43(5): 250-259.
HU Haowen1,2,CHEN Denghong1,2,WANG Qianfeng1,2,HU Jilei1,2,LUO Huan1,2. UQ analysis in calculating SIFs based on SBFEM. JOURNAL OF VIBRATION AND SHOCK, 2024, 43(5): 250-259.
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