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Numerical modelling of crack propagation in ductile materials combining the GTN model and X-FEM

机译:结合GTN模型和X-FEM的延性材料裂纹扩展的数值模拟

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The present work is devoted to the numerical simulation of crack propagation in engineering materials whose failure results from void initiation, growth and coalescence. The behaviour of the plate material is described via a Gurson type model accounting for the combined effects of strain hardening, thermal softening, viscoplasticity and void growth induced damage. The extended Finite Element Method has been retained to describe the kinematic consequences of the crack propagation across the mesh. The crack is assumed to propagate as soon as the stored energy around the crack tip reaches a critical value. The related crack length is estimated using an exhaustion method. The constitutive model and the extended finite elements were both implemented in the engineering FE computation code Abaqus as user subroutines. The numerical simulation of a notched plate and an asymmetrically notched plate under tension loading has been conducted. While making some simplifications, the present work reproduces numerically the 2D propagation of a crack resulting from void growth induced damage.
机译:目前的工作致力于工程材料中裂纹扩展的数值模拟,其失效是由空洞的引发,生长和聚结导致的。通过Gurson型模型描述了板材的行为,该模型考虑了应变硬化,热软化,粘塑性和空洞生长引起的损伤的综合作用。保留了扩展的有限元方法来描述裂纹在网格上传播的运动学后果。假定裂纹尖端周围的存储能量达到临界值时,裂纹就会传播。相关的裂纹长度是用耗竭法估算的。本构模型和扩展有限元都在工程有限元计算代码Abaqus中作为用户子例程实现。进行了缺口板和非对称缺口板在拉力作用下的数值模拟。在进行一些简化的同时,本工作从数值上再现了由空洞生长引起的损伤导致的裂纹的二维传​​播。

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