Crystal plasticity modeling of ultrasonic softening effect considering anisotropy in the softening of slip systems
Crystal plasticity modeling of ultrasonic softening effect considering anisotropy in the softening of slip systems
复制标题
DOI：
10.1016/j.ijplas.2022.103343
复制
发表时间：
2022-05
影响因子：
9.8
通讯作者：
Jiarui Kang;Xun Liu;S. Niezgoda
中科院分区：
文献类型：
--
作者：
Jiarui Kang;Xun Liu;S. Niezgoda
在这项研究中，开发了一种新的方法来模拟金属塑性过程中的超声波软化效应，其中滑移系根据其相对于超声波方向的取向经历差分软化。定向软化模型在粘塑性自洽（VPSC）模型中实现，其中材料和超声软化参数基于纯铜的微拉伸试验数据进行校准，拉伸沿着轧制方向。然后用试样沿沿着横向受拉时的应力-应变响应对模型进行了验证。VPSC模型的结果提供了新的见解超声软化，特别是应力降低是不均匀的，在整个骨料。软化的程度显示出强烈的依赖于晶粒取向。在塑性硬的高泰勒因子晶粒中观察到更高水平的应力降低。泰勒因子的减少，特别是在具有较高应力降低的晶粒子集，这与实验数据相一致。尽管传统的各向同性软化模型也能够预测不同纹理输入的超声软化应力-应变响应，但无法捕获泰勒因子的这种降低。
In this study, a novel approach to modeling the ultrasonic softening effect during metal plasticity is developed, where the slip systems experience differential softening depending on their orientation relative to the ultrasonic direction. The directional softening model was implemented within a Visco-Plastic Self-Consistent (VPSC) model, where the material and ultrasonic softening parameters are calibrated based on micro-tensile test data of pure copper with tension along the rolling direction of sheet. The model is then validated against the stress-strain response of the samples with tension along transverse direction. The VPSC modeling results provide new insights into ultrasonic softening, particularly that the stress reduction is not homogeneous in the whole aggregate. The degree of softening shows a strong dependence on grain orientation. A higher level of stress reduction is observed in plastically hard, high Taylor factor grains. A decrease in Taylor factor is predicted, especially in the grain subset with higher stress reduction, which agrees with experimental data. Although a traditional isotropic softening model is also capable in predicting the ultrasonically softened stress-strain response for different texture inputs, this decrease in Taylor factor cannot be captured.