Comparative assessment of backstress models using high-energy X-ray diffraction microscopy experiments and crystal plasticity finite element simulations
Comparative assessment of backstress models using high-energy X-ray diffraction microscopy experiments and crystal plasticity finite element simulations
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DOI：
10.1016/j.ijplas.2020.102887
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发表时间：
2021
影响因子：
9.8
通讯作者：
R. Bandyopadhyay;Sven E. Gustafson;K. Kapoor;Diwakar Naragani;D. Pagan;M. Sangid
中科院分区：
文献类型：
--
作者：
R. Bandyopadhyay;Sven E. Gustafson;K. Kapoor;Diwakar Naragani;D. Pagan;M. Sangid
晶体塑性（CP）模型自成立以来一直在发展。先进的实验表征方法，大大有助于评估性能和随后的改进，许多经验关系，在CP，这是直接从经典塑性理论的固体在宏观尺度上。在这项研究中，高能X射线衍射显微镜（HEDM）已被用来跟踪的应力状态的单个晶粒内的多晶聚集体的镍基高温合金进行循环加载。使用路径依赖，介观应力状态的HEDM实验，两个运动硬化模型的性能，在CP的上下文中，已被评估。其中一个模型是经验的Armstrong-Frederick方程，另一个是基于几何必要位错（GND）的唯象模型。结果表明，基于GND的模型是能够捕获的循环晶体塑性响应。目前的验证工作，预计将采取CP模型更接近其在现代工程工作流程中的实施。
Crystal plasticity (CP) models have been evolving since their inception. Advanced experimental characterization methods have contributed significantly to assess the performance and subsequent improvement of many empirical relations in CP, which were directly adopted from classical plasticity theories of solids at the macro-scale. In this research, high energy X-ray diffraction microscopy (HEDM) has been used to track the stress-state of individual grains within a polycrystalline aggregate of a Nickel-base superalloy subjected to cyclic loading. Using path-dependent, mesoscopic stress-states from the HEDM experiment, the performance of two kinematic hardening models, in the context of CP, has been assessed. One of the models is an empirical Armstrong-Frederick equation, and the other is a geometrically necessary dislocation (GND)-based phenomenological model. The results suggest that the GND-based model is capable of capturing the cyclic crystal plasticity response. The present validation efforts are expected to take CP models one step closer towards their implementation in modern engineering workflow.