In the work, we develop and implement force and deformation models of the strain and damage accumulation rates in creep with the use of the ANSYS finite-element analysis software. Numerical calculations are performed on a plane plate with a rectilinear through crack under biaxial loading and on a three-dimensional compact specimen under eccentric tension. The obtained stress-strain fields are used to calculate the contour In integral in the vicinity of the crack tip as well as the distribution of the stress intensity factor at the creep stages. It is found that these parameters behave differently depending on the damage function formulation. It is shown that the creep stress intensity factor can be used as a fracture resistance characteristic that is sensitive to the used model and accumulated damage level, the biaxial loading type and material properties.

中文翻译：

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基于应力和应变的蠕变损伤累积模型

在这项工作中，我们使用 ANSYS 有限元分析软件开发和实施蠕变应变和损伤累积率的力和变形模型。数值计算是在双轴加载下具有直线贯通裂纹的平板和偏心拉伸下的三维致密试件上进行的。获得的应力-应变场用于计算裂纹尖端附近的轮廓In积分以及蠕变阶段应力强度因子的分布。发现这些参数的行为取决于损伤函数公式。结果表明，蠕变应力强度因子可作为对所用模型和累积损伤水平敏感的抗断裂特性，