Substructure-sensitive crystal plasticity with material-invariant parameters
Substructure-sensitive crystal plasticity with material-invariant parameters
复制标题
具有材料不变参数的子结构敏感晶体塑性
DOI：
10.1016/j.ijplas.2022.103306
复制
发表时间：
2022
影响因子：
9.8
通讯作者：
Dindarlou S
中科院分区：
文献类型：
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作者：
Dindarlou S
尽管晶体塑性模型已经存在了几十年，但材料参数的量化仍然是一个有争议的问题。多晶实验结果通常可以通过多组参数来重现，这引起了人们对预测晶粒级响应的最佳参数化的担忧。这项工作提出了一种基于介观位错子结构的新型物理晶体塑性模型，用于独立表征材料参数。我们采用一组具有已知不确定性的独特参数来重现 FCC 单晶和多晶的机械响应。我们证明介观参数是材料不变的，可用于模拟具有类似位错子结构（例如铜、镍和铝）的 FCC 金属。此外，通过与实验单晶和多晶应力应变曲线以及介观位错亚结构图像进行比较，对该模型进行了验证。这种新颖的建模方法本质上是为了预测具有相似位错子结构的材料的响应而无需单晶实验数据进行校准。
Even though crystal plasticity models have been available for decades, the quantification of material parameters is still a matter of debate. Polycrystalline experimental results can normally be reproduced by multiple sets of parameters, raising concerns about the best parameterization to predict the grain-level response. This work presents a novel physics-based crystal plasticity model based on mesoscale dislocation substructures, which are used to characterize material parameters independently. We employ a unique set of parameters with known uncertainty to reproduce the mechanical response of FCC single- and poly-crystals. We demonstrate that mesoscale parameters are material-invariant and can be used to model FCC metals with similar dislocation substructures such as for Cu, Ni and Al. Furthermore, the model is validated by comparing to experimental single- and poly-crystalline stress–strain curves and mesoscale dislocation substructure images. This novel modelling approach is intrinsically designed to predict the response of materials with similar dislocation substructures without the need of single crystal experimental data for calibration.