An efficient FE-implementation of implicit gradient-enhanced damage models to simulate ductile failure
An efficient FE-implementation of implicit gradient-enhanced damage models to simulate ductile failure
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DOI：
10.1016/j.engfracmech.2018.01.022
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发表时间：
2018-08
影响因子：
5.4
通讯作者：
A. Seupel;G. Hütter;M. Kuna
中科院分区：
文献类型：
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作者：
A. Seupel;G. Hütter;M. Kuna
我们提出了一个战略，它允许实施一个完全耦合，梯度增强的破坏法到商业有限元代码，几乎没有努力。这使得实际工程问题的鲁棒模拟能够避免由于损伤影响而导致的虚假网格依赖性。该方法应用于剪切为主的金属延性损伤模型，该模型由工程师使用，并且通常在FEM程序中的局部公式中可用;例如，ABAQUS。该模型包括一个损伤起始准则，其次是损伤演化规律，耦合到弹塑性本构方程。收敛性研究表明，实施的适用性，为2D和3D边值问题。一个基准问题的裂纹扩展模拟结果与文献中的类似方法相比是合理的。
We present a strategy which allows to implement a fully coupled, gradient-enhanced damage law into commercial FEM-codes with little effort. This enables a robust simulation of practical engineering problems avoiding spurious mesh dependency due to damage influence. The method is applied to a model for shear dominated, ductile damage of metals, which is used by engineers and often available in its local formulation within FEM-programs; e.g., ABAQUS. The model consists of a damage initiation criterion, followed by a damage evolution law which is coupled to the elastic-plastic constitutive equations. Convergence studies show the applicability of the implementation for 2D and 3D boundary value problems. Crack growth simulations of a benchmark problem show reasonable results compared to similar approaches from literature.