GOALI: Multi-Scale Characterization and Modeling of Anisotropy and Failure of Aluminum Alloys for Automotive Applications

GOALI：汽车应用铝合金各向异性和失效的多尺度表征和建模

• 批准号: 1663269
• 负责人: Stelios Kyriakides
• 金额: $ 49.72万
• 依托单位: University of Texas at Austin
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2017
• 资助国家: 美国
• 起止时间: 2017-08-15 至 2023-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1663269&HistoricalAwards=false
• 关键词: GOALI; Multi; Scale; Characterization; Modeling

Increasing the fuel efficiency of automobiles is a major driver for the automotive industry's recent efforts towards lightweight manufacturing. To achieve this goal, industry has identified the use of aluminum alloys in vehicle design and manufacture as an essential technology. Aluminum, with a density of 34 percent that of steel, is plentiful and recyclable, but has one-third the stiffness of steel, is more expensive to produce, has more complex material behavior, is less ductile with limited design experience within the automobile industry. To understand these properties and overcome these challenges, robust computational models of deformation and failure are essential. This Grant Opportunities for Academic Liaison with Industry (GOALI) award is a cooperative project between Industry (General Motors) and University (University of Texas at Austin) which supports fundamental scientific research aimed at developing enabling simulation technology for aluminum alloys through experimentation, modeling and validation. This will be achieved through a strong interaction between the university and industry research teams, including graduate student training through summer residency in General Motors labs and exposure of undergraduate students, including those from underrepresented groups, to current industry challenges. These interactions will provide broad impact by ensuring that the research generates new scientific knowledge with long-term benefits to engineering problems aligned with industrial needs, and will train future leaders in academia and industry with the skills to lead scientific innovation with engineering applications.The experimental approach of the research plan includes conducting custom designed biaxial tests on tubes using two aluminum alloys to establish the evolution of plastic deformation up to failure under a range of triaxialities and Lode angles, while monitoring the deformation with three-dimensional digital image correlation. In-situ experiments on small-scale specimens under electron microscopes will be conducted, where the evolution of deformation under different stress states can be quantified up to failure. Small-scale testing will be performed using electron backscatter diffraction imaging in order to establish the evolution of texture. The modeling efforts include calibration of state of the art anisotropic yield functions and development of dependable failure criteria, and enhancement of the failure criteria using results from the small-scale experiments and establishment of the evolution of yield surfaces through crystal plasticity. The integrated approach involving well-calibrated continuum level plasticity and failure models, validated through their performance in simulating independent axial quasi-static and dynamic tube crushing experiments, is the major intellectual merit of the work. Transfer of the developed technology to industry can be immediate, as the crushing simulations developed and enhanced through this research are one of the most demanding tasks in automobile safety assurance.

提高汽车的燃料效率是汽车工业最近努力实现轻量化制造的主要驱动力。为了实现这一目标，工业界已将铝合金在车辆设计和制造中的使用确定为一项必不可少的技术。铝的密度是钢的34%，数量丰富，可回收利用，但刚度只有钢的三分之一，生产成本更高，材料性能更复杂，延展性较差，在汽车工业中的设计经验有限。为了理解这些特性并克服这些挑战，强大的变形和破坏计算模型是必不可少的。该奖项是工业（通用汽车）和大学（德克萨斯大学奥斯汀分校）之间的合作项目，旨在通过实验，建模和验证开发铝合金的模拟技术。这将通过大学和行业研究团队之间的强有力的互动来实现，包括通过在通用汽车实验室的夏季实习进行研究生培训，以及让本科生（包括来自代表性不足的群体的学生）接触当前的行业挑战。这些相互作用将产生广泛的影响，确保研究产生新的科学知识，对符合工业需求的工程问题产生长期利益，并将培养未来的学术界和工业界的领导者，使其具备领导科学创新和工程应用的技能。研究计划的实验方法包括对使用两种铝合金的管进行定制设计的双轴测试，以建立演变过程。在三维数字图像相关法监测变形的同时，对不同三轴度和矿脉角下的塑性变形直至破坏进行了研究。将在电子显微镜下对小尺寸试样进行原位实验，其中可以量化不同应力状态下的变形演变直至失效。将使用电子背散射衍射成像进行小规模测试，以确定纹理的演变。建模工作包括校准的最先进的各向异性屈服函数和可靠的故障标准的发展，和增强的故障标准使用的结果从小规模的实验和建立屈服面的演变，通过晶体塑性。集成的方法，包括校准连续水平的塑性和故障模型，通过其性能在模拟独立的轴向准静态和动态管破碎实验验证，是主要的智力价值的工作。开发的技术可以立即转移到工业中，因为通过这项研究开发和增强的破碎模拟是汽车安全保证中最苛刻的任务之一。