Strain localization and dynamic recrystallization in polycrystalline metals: Thermodynamic theory and simulation framework
Strain localization and dynamic recrystallization in polycrystalline metals: Thermodynamic theory and simulation framework
复制标题
DOI：
10.1016/j.ijplas.2019.03.005
复制
发表时间：
2018-08
影响因子：
9.8
通讯作者：
C. Lieou;H. Mourad;C. Bronkhorst
中科院分区：
文献类型：
--
作者：
C. Lieou;H. Mourad;C. Bronkhorst
我们描述了多晶材料中绝热剪切带(ASB)和动态再结晶(DRX)的理论和计算框架。多晶塑性的Langer-Bouchbinder-Lookman(LBL)热力学理论，我们最近重新表述，通过包含晶界密度或晶粒度作为内态变量来描述DRX，它提供了一种方便和自洽的方法来描述材料的粘塑性和热行为，并且只需最小限度地假设屈服或剪切带化的开始。我们结合有限元计算框架实现了LBL-DRX理论。与用分离式Hopkinson压杆压缩的顶帽AISI316L不锈钢试件的实验测量结果的对比表明了LBL-DRX框架的准确性和实用性，并证明了DRX在应变局部化中的关键作用。
We describe a theoretical and computational framework for adiabatic shear banding (ASB) and dynamic recrystallization (DRX) in polycrystalline materials. The Langer-Bouchbinder-Lookman (LBL) thermodynamic theory of polycrystalline plasticity, which we recently reformulated to describe DRX via the inclusion of the grain boundary density or the grain size as an internal state variable, provides a convenient and self-consistent way to represent the viscoplastic and thermal behavior of the material, with minimal ad-hoc assumptions regarding the initiation of yielding or onset of shear banding. We implement the LBL-DRX theory in conjunction with a finite-element computational framework. Favorable comparison to experimental measurements on a top-hat AISI 316L stainless steel sample compressed with a split-Hopkinson pressure bar suggests the accuracy and usefulness of the LBL-DRX framework, and demonstrates the crucial role of DRX in strain localization.