FINITE-ELEMENT ANALYSIS OF CREEP CRACK-GROWTH BY A LOCAL APPROACH
FINITE-ELEMENT ANALYSIS OF CREEP CRACK-GROWTH BY A LOCAL APPROACH
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DOI：
10.1016/0020-7403(88)90003-3
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发表时间：
1988-01-01
影响因子：
7.3
通讯作者：
RONG, H
中科院分区：
文献类型：
--
作者：
MURAKAMI, S;KAWAI, M;RONG, H
本文从连续介质损伤力学的观点讨论了局部法分析双向拉伸下平板蠕变裂纹扩展的适用性。本文将作者发展的各向异性蠕变损伤理论应用于基于二维单纯形单元的有限元分析中，分析了含内裂纹薄板在比例和非比例载荷作用下蠕变损伤导致裂纹萌生和扩展的过程。重点讨论了破裂时间和裂纹扩展模式对网格离散化的依赖性。阐述了损伤各向异性对蠕变裂纹扩展和破裂时间的影响，并将数值结果与基于各向同性损伤理论的相应结果进行了比较。局部破裂准则的影响进行了讨论。
The applicability of a local approach to the analysis of creep crack growth in a plate under biaxial tension is discussed from the point of view of continuum damage mechanics. The anisotropic creep damage theory developed by the present authors is implemented into a finite element analysis based on two-dimensional simplex elements, and the creep damage process leading to the initiation and propagation of creep cracks in a thin plate with an internal crack under proportional and non-proportional loadings is analysed. Special emphasis is placed on the discussion of the dependence of the rupture times and the crack extension pattern on the mesh discretization. The effects of damage anisotropy on the creep crack extension and the rupture times are elucidated; the numerical results are compared with the corresponding results based on isotropic damage theory. The effects of a local rupture criterion are also discussed.