Phase-field modeling of porous-ductile fracture in non-linear thermo-elasto-plastic solids
Phase-field modeling of porous-ductile fracture in non-linear thermo-elasto-plastic solids
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DOI：
10.1016/j.cma.2019.112730
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发表时间：
2020-04-01
影响因子：
7.2
通讯作者：
Hesch, C.
中科院分区：
文献类型：
--
作者：
Dittmann, M.;Aldakheel, F.;Hesch, C.
相场法使尖锐的界面正规化是当今公认的技术。在断裂力学方面，最近的工作已经证明了该方法在完全非线性区域内描述的脆性和延性问题的能力。在这篇文章中，我们介绍了一个框架来模拟经历大变形的各向同性热弹塑性固体中的多孔延性断裂。因此，将修正的Gurson-Tvergaard-Needleman GTN型塑性模型与相场断裂方法相结合，在微观尺度上考虑孔洞的温度依赖性扩展，在宏观尺度上考虑裂纹的萌生和扩展。通过在热场中引入能量传递，从而使温度分布取决于塑性应变和裂纹相场的演化，从而完成了多物理公式。最后，通过实验数据对该物理综合裂缝公式进行了验证。(C)2019爱思唯尔B.V.保留所有权利。
Phase-field methods to regularize sharp interfaces represent a well established technique nowadays. In fracture mechanics, recent works have shown the capability of the method for brittle as well as ductile problems formulated within the fully non-linear regime. In this contribution, we introduce a framework to simulate porous-ductile fracture in isotropic thermoelasto-plastic solids undergoing large deformations. Therefore, a modified Gurson-Tvergaard-Needleman GTN-type plasticity model is combined with a phase-field fracture approach to account for a temperature-dependent growth of voids on micro-scale followed by crack initiation and propagation on macro-scale. The multi-physical formulation is completed by the incorporation of an energy transfer into the thermal field such that the temperature distribution depends on the evolution of the plastic strain and the crack phase-field. Eventually, this physically comprehensive fracture formulation is validated by experimental data. (C) 2019 Elsevier B.V. All rights reserved.