GOALI: Multi-Scale Deformation and Failure Modeling of Magnesium Alloys for Impact Analysis and Forming Process Simulations

该项目的目标是与通用汽车（GM）研发中心合作，开发一种新的实验验证，基于物理的多级计算模型系统，用于模拟镁合金的多尺度变形和预测延性失效。模拟将集中在高应变率冲击载荷和成形过程。多尺度模型将开发三个相关尺度的模块，即（i）结构组分的宏观尺度，（ii）单个晶粒和多晶聚集体的微观尺度，以及（iii）用于假设裂纹演化的晶格的原子尺度。同质化和本地化策略将被纳入一个层次并行框架。具体的开发模块包括：（i）基于图像的三维微观结构生成的多晶聚集体，（ii）基于图像的晶体塑性有限元模型的微观结构变形和故障，（iii）均匀连续塑性损伤法纳入宏观模型，和（iv）宏观模拟。GM将负责不同规模的实验，以验证和校准计算模型。该计划将提供对镁合金变形和失效特性的微观结构的作用的前所未有的理解。镁合金在提高汽车工业的燃油效率和节能方面具有巨大的潜力，这将得到促进。该计划将帮助材料行业，材料开发因不知道不同尺度的可变性如何影响性能和加工而受到阻碍。研究生将与杰出的工业研究人员进行强有力的互动。该计划将教育下一代工程师对新兴技术的挑战，具有独特的行业视角。

The objective of this Grant Opportunity for Academic Liaison with Industry (GOALI) project, in collaboration with General Motors (GM) R&D Center, will develop a novel system of experimentally validated, physics-based multi-level computational models for simulating multi-scale deformation and predicting ductile failure in Magnesium alloys. Simulations will focus on high strain rate impact loading and forming processes. The multi-scale model will develop modules at three relevant scales, viz. (i) macroscopic scale of structural components, (ii) microscopic scale of individual grains and polycrystalline aggregates, and (iii) atomic scales of crystal lattices for postulating crack evolution. Both homogenization and localization strategies will be incorporated in a hierarchical-concurrent framework. Specific developmental modules include: (i) image-based three-dimensional microstructure generation of polycrystalline aggregates, (ii) image-based crystal-plasticity FEM modeling of microstructural deformation and failure, (iii) homogenized continuum plasticity-damage laws for incorporation in macroscopic models, and (iv) macroscopic simulations. GM will be responsible for experiments at different scales to validate and calibrate the computational models. The program will provide an unprecedented understanding of the role of microstructure on deformation and failure characteristics in Magnesium alloys. Magnesium alloys have a huge potential for enhancing fuel efficiency and energy economization in the automotive industry, which will be facilitated. The program will aid the materials industry, where materials development is stymied by not knowing how variabilities at different scales affect performance and processing. Graduate students will have a strong interaction with eminent industrial researchers. The program will educate next generation of engineers on the challenges of emerging technologies, with a unique academia-industry perspective.