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Dislocation density based modelling of electrically assisted deformation process by finite element approach
International Journal of Mechanical Sciences ( IF 7.3 ) Pub Date : 2022-06-17 , DOI: 10.1016/j.ijmecsci.2022.107433
Jai Tiwari , Vikram Balaji , Hariharan Krishnaswamy , Murugaiyan Amirthalingam

Application of electric current, while deforming the material is known to aid the deformation process due to electroplastic effect. The experimentally observed behaviour during the application of electric current is generally correlated to the combined effect of Joule heating and localized electron–dislocation interaction. As the governing mechanism of electroplasicity lacks consensus, constitutive modelling of the said behaviour is challenging and scarce. The mathematical models reported in the literature often found to describe the electrically assisted deformation behaviour by only considering Joule’s heating effect. A fully coupled thermal–metallurgical model is required to underpin the mechanism of electrically assisted deformation process. In this work, we are presenting a novel strategy to predict the electrical assisted deformation process by developing a fully coupled thermal and dislocation density based constitutive model. This modelling approach is implemented in a commercial finite element software using subroutines. The implemented model is evaluated to predict the electrical assisted deformation behaviour of aluminium alloys subjected to both continuous and pulsed current. The implemented model is able to successfully simulate the electrical assisted deformation process.



中文翻译:

基于位错密度的有限元电辅助变形过程建模

已知在使材料变形的同时施加电流有助于由于电塑性效应而产生的变形过程。在施加电流期间实验观察到的行为通常与焦耳加热和局部电子 - 位错相互作用的组合效应相关。由于电塑性的调控机制缺乏共识,所述行为的本构建模具有挑战性且稀缺。文献中报道的数学模型经常被发现用于描述电辅助变形行为只考虑焦耳的热效应。需要一个完全耦合的热冶金模型来支持电辅助变形过程的机制。在这项工作中,我们提出了一种新的策略,通过开发基于完全耦合的热和位错密度的本构模型来预测电辅助变形过程。这种建模方法是在使用子程序的商业有限元软件中实现的。对实施的模型进行评估,以预测铝合金在连续和脉冲电流下的电辅助变形行为。所实施的模型能够成功地模拟电辅助变形过程。

更新日期:2022-06-17
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