Homogenization and localization of unidirectional fiber-reinforced composites with evolving damage by FVDAM and FEM approaches: A critical assessment
Homogenization and localization of unidirectional fiber-reinforced composites with evolving damage by FVDAM and FEM approaches: A critical assessment
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通过 FVDAM 和 FEM 方法对不断变化的损伤进行单向纤维增强复合材料的均匀化和定位：关键评估
DOI：
10.1016/j.engfracmech.2020.107280
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发表时间：
2020
影响因子：
5.4
通讯作者：
Qiang Chen
中科院分区：
文献类型：
--
作者：
Wenqiong Tu;Qiang Chen
最近开发的有限体积直接平均细观力学（FVDAM）与渐进损伤模拟能力建模使用的凝聚力区模型进行了严格和充分的评估维斯维斯，广泛采用的商业有限元代码与凝聚力元素的第一次。在这两种计算方法中，采用可比较的双线性牵引-位移分离律，模拟了单向金属基复合材料沿纤维/基体界面沿着的脱粘过程。这两种方法之间的差异突出显示，包括基于Abaqus的有限元分析不断变化的损害的缺点。这些缺点包括需要优化界面的抗压刚度，以避免材料相互渗透;预测正确的均匀化响应;防止数值不稳定性。这些问题是不存在的，在我们的版本的有限体积均匀化方法，因为在受影响的法线方向的牵引分离关系直接消除时，接口处于压缩状态。尽管如此，对有限元和有限体积技术产生的均匀化响应和局部应力场的比较表明，只要在Abaqus中选择合适的压缩因子，两种方法之间具有良好的一致性。
The recently-developed finite-volume direct averaging micromechanics (FVDAM) with progressive damage simulation capability modeled using the cohesive zone model is critically and fully assessed vis-à-vis Abaqus, a widely-adopted commercial finite-element code with cohesive element for the first time. The evolving debonding along the fiber/matrix interface of a unidirectional metal matrix composite is simulated using comparable bilinear traction-displacement separation laws in the two computational approaches. Differences between the two approaches are highlighted, including shortcomings of the Abaqus-based finite-element analysis of evolving damage. These shortcomings include the need of optimizing the compressive stiffness of the interface in order to: avoid material interpenetration; predict correct homogenized response; prevent numerical instabilities. These problems are not present in our version of the finite-volume homogenization approach since the traction-separation relations in the affected normal direction are directly eliminated when the interface is under compression. Nonetheless, comparison of the homogenized response and localized stress fields generated by the finite-element and finite-volume techniques demonstrates good agreement between the two approaches provided that a suitable compression factor is chosen in Abaqus.