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

GOALI：镁合金的多尺度变形和失效建模，用于冲击分析和成形过程模拟

• 批准号: 1100818
• 负责人: Somnath Ghosh
• 金额: $ 32万
• 依托单位: Johns Hopkins University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2011
• 资助国家: 美国
• 起止时间: 2011-08-01 至 2016-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1100818&HistoricalAwards=false
• 关键词: GOALI; Multi; Scale; Deformation; Failure

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.

该学术联络与工业（GOALI）项目的目标是与通用汽车（GM）研发中心合作，开发一套经过实验验证的、基于物理的多级计算模型，用于模拟镁合金的多尺度变形和预测韧性破坏。模拟将集中在高应变率冲击加载和成形过程。多尺度模型将在三个相关尺度上开发模块，即(i)结构部件的宏观尺度，（ii）单个颗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都将被合并到一个层次并行的框架中。具体的开发模块包括：(i)基于图像的三维微观结构生成多晶聚集体，（ii）基于图像的微观结构变形和破坏的晶体塑性有限元建模，（iii）均质连续塑性-损伤规律纳入宏观模型，以及（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。该程序将提供对镁合金变形和失效特征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燃油效率和节能方面具有巨大的潜力，这将得到促进。该项目将帮助材料行业，因为不知道不同尺度的变化如何影响性能和加工而阻碍了材料的开发。研究生将与杰出的工业研究人员有很强的互动。该项目将以独特的学术-行业视角，教育下一代工程师应对新兴技术的挑战。