Ductile failure simulations using a multi-surface coupled damage-plasticity model
Ductile failure simulations using a multi-surface coupled damage-plasticity model
复制标题
使用多表面耦合损伤塑性模型进行延性失效模拟
DOI：
10.1016/j.ijplas.2019.02.007
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发表时间：
2019
影响因子：
9.8
通讯作者：
S. M. Keralavarma
中科院分区：
文献类型：
--
作者：
D. Reddi;V. K. Areej;S. M. Keralavarma
采用损伤-塑性耦合模型研究了各向同性多孔材料的韧性破坏，考虑了扩散塑性流动引起的孔隙增长以及孔隙间韧带中塑性流动局部化引起的孔隙合并。该模型是基于一个多表面屈服准则，包括Gurson屈服准则的多孔代表性体积元（RVE）进行扩散屈服，和额外的屈服准则对应于局部屈服的离散聚结带内的RVE的方向取决于所施加的应力状态。近似封闭形式的解决方案的潜在的合并带的方向作为所施加的应力的函数，并提出了一个封闭形式的表达合并的标准，表示在主应力。预测的形状的多表面屈服轨迹在大值的孔隙度有一个显着的相似性的Mohr-Coulomb屈服轨迹的颗粒材料的八面体截面，并减少约Gurson屈服轨迹的孔隙度的小值。在比例加载条件下，塑性模型的数值积分，和预测的应变破坏得到的加载路径参数，应力三轴度和矿脉参数的函数。的加载路径依赖的延性的预测趋势被证明是在很好的定性协议与最近的微观力学空洞细胞模拟的结果，在拉伸和剪切相结合。最后，在光滑和缺口杆拉伸实验中的应变失效的预测得到的有限元模拟使用的多表面和广泛使用的Gurson-Tvergaard-Needleman（GTN）模型。结果表明，多表面模型，在没有启发式的可调参数，定量预测类似的值的整体应变故障的GTN模型，使用典型值的参数在后者的模型。
Ductile failure of isotropic porous materials is studied using a coupled damage-plasticity model, accounting for void growth by diffuse plastic flow as well as void coalescence by plastic flow localization in the inter-void ligaments. The model is based on a multi-surface yield criterion, consisting of the Gurson yield criterion for a porous representative volume element (RVE) undergoing diffuse yielding, and additional yield criteria corresponding to localized yielding of the RVE within discrete coalescence bands whose orientations depend on the applied state of stress. Approximate closed form solutions for the orientations of the potential coalescence bands as a function of the applied stress are obtained; and a closed form expression for the coalescence criterion, expressed in terms of the principal stresses, is proposed. The predicted shapes of the multi-surface yield loci at large values of the porosity have a marked resemblance to the Mohr-Coulomb yield locus for granular materials on octahedral section planes, and reduce approximately to the Gurson yield locus for small values of the porosity. The plasticity model is integrated numerically under proportional loading conditions, and predictions for the strains to failure are obtained as a function of the loading path parameters, the stress triaxiality and the Lode parameter. The predicted trends for the loading path dependence of ductility are shown to be in good qualitative agreement with the results of recent micromechanical voided cell simulations under combined tension and shear. Finally, predictions for the strains to failure in smooth and notched bar tension experiments are obtained from finite element simulations using the multi-surface and the widely used Gurson-Tvergaard-Needleman (GTN) models. It is shown that the multi-surface model, in the absence of heuristic adjustable parameters, quantitatively predicts similar values of the overall strains to failure as the GTN model; using typical values of the parameters in the latter model.
影响因子：
9.4
作者：
Pineau, A.;Benzerga, A. A.;Pardoen, T.
通讯作者：
Pardoen, T.
影响因子：
2.5
作者：
Benzerga, Ahmed Amine;Leblond, Jean-Baptiste;Tvergaard, Viggo
通讯作者：
Tvergaard, Viggo