Nonlocal Modeling and Simulation of Ductile Damage and Failure in Metal Matrix Composites
Nonlocal Modeling and Simulation of Ductile Damage and Failure in Metal Matrix Composites
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金属基复合材料延性损伤和失效的非局部建模与仿真
DOI：
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发表时间：
2008
期刊：
影响因子：
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通讯作者：
B. Svendsen
中科院分区：
文献类型：
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作者：
F. Reusch;C. Hortig;B. Svendsen
当前工作的目的是应用最近的非局部扩展（Reusch，F.，Sundarsen，B.，和Klingbeil，D.，2003年，“局部和非局部基于Gurson的大变形延性损伤和失效模型”，Eur。J. Mech. A/Solids，22，pp. 779-792;“基于Gurson的延性损伤建模的非局部扩展”，计算。Mater.科学，26，pp. 219-229）的Gurson-Needleman-Tvergaard（GTN）模型（Needleman，A.，和Tvergaard，V.，1984年，“缺口棒中韧性断裂的分析”，J. Mech Phys. Solids，32，pp. 461-490）在微观结构水平上模拟金属基复合材料中的延性损伤和失效过程。扩展模型的基础上的治疗作为一个非局部过程的空隙合并。特别是，我们比较了GTN模型与非局部扩展的预测在理想和真实的Al-SiC金属基体微观结构的延性裂纹萌生。如金属基复合材料的当前结果所示，正如预期的那样，基于局部GTN模型的金属基复合材料微观结构水平上的结构响应和预测裂纹路径的模拟结果具有很强的网格依赖性。另一方面，那些基于目前的非局部空洞合并建模方法是网格无关的。这与以下事实相关：与局部方法相反，非局部方法对此处考虑的真实的Al-SiC金属基复合材料微观结构中的裂纹扩展路径的预测与实验确定的路径吻合得很好。
The purpose of the current work is the application of a recent nonlocal extension (Reusch, F., Svendsen, B., and Klingbeil, D., 2003, "Local and Non-Local Gurson-Based Ductile Damage and Failure Modelling at Large Deformation," Eur. J. Mech. A/Solids, 22, pp. 779-792; "A Non-Local Extension of Gurson-Based Ductile Damage Modeling," Comput. Mater. Sci., 26, pp. 219-229) of the Gurson-Needleman-Tvergaard (GTN) model (Needleman, A., and Tvergaard, V., 1984, "An Analysis of Ductile Rupture in Notched Bars," J. Mech Phys. Solids, 32, pp. 461-490) to the simulation of ductile damage and failure processes in metal matrix composites at the microstructural level. The extended model is based on the treatment of void coalescence as a nonlocal process. In particular, we compare the predictions of the local with GTN model with those of the nonlocal extension for ductile crack initiation in ideal and real Al-SiC metal matrix microstructures. As shown by the current results for metal matrix composites and as expected, the simulation results based on the local GTN model for both the structural response and predicted crack path at the microstructural level in metal matrix composites are strongly mesh-dependent. On the other hand, those based on the current nonlocal void-coalescence modeling approach are mesh-independent. This correlates with the fact that, in contrast to the local approach, the predictions of the nonlocal approach for the crack propagation path in the real Al-SiC metal matrix composite microstructure considered here agree well with the experimentally determined path.