GOALI: Exploitation of an Experimentally Characterized Stress Based Failure Criterion to Advance Sheet Metal Forming

目标：利用实验表征的基于应力的失效准则来推进金属板材成形

• 批准号: 0654124
• 负责人: Brad Kinsey
• 金额: --
• 依托单位: University of New Hampshire
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2007
• 资助国家: 美国
• 起止时间: 2007-09-01 至 2011-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0654124&HistoricalAwards=false
• 关键词: GOALI; Exploitation; Experimentally; Characterized; Stress

The goals of this Grant Opportunities for Liaison with Industry (GOALI) research project are to experimentally and analytically characterize the stress based failure criterion for sheet materials; to incorporate the criterion into finite element models of the sheet metal forming process; and to exploit the material phenomenon through process innovations. Past research has shown that the stress based failure criterion is path independent or at least less sensitive to the deformation path than the commonly used strain based failure criterion. First, a biaxial test apparatus will be used to characterize the stress based failure criterion for advanced alloys. Using this experimental data, analytical and numerical models will be developed to assist designers determine the correct process variation in order to prevent tearing concerns. Finally, process innovations for both deep drawing and stretch forming will be implemented to exploit this material behavior. This research will add significantly to the scientific knowledge base for this emerging material characteristic.There are several broader impacts from this research. First, improved failure prediction methods will benefit society at large through a reduction in the time to market of new products and more aggressive product designs, which will decrease the weight and cost of components. Graduate students will also benefit from the potential to work with industrial partners as summer interns. Furthermore, the results of this research will be directly integrated into course material thus impacting the education of students. Finally, to ensure that the results of this research are effectively disseminated to industries, a set of workshops will be conducted at Alcoa.

该研究项目的目标是通过实验和分析表征基于应力的板材失效准则;将该准则纳入板材成形过程的有限元模型;并通过工艺创新利用材料现象。过去的研究表明，基于应力的破坏准则是路径无关的，或者至少比常用的基于应变的破坏准则对变形路径不太敏感。首先，双轴试验装置将用于表征先进合金的基于应力的失效准则。利用这些实验数据，将开发分析和数值模型，以帮助设计人员确定正确的工艺变化，以防止撕裂的问题。最后，深冲和拉伸成形的工艺创新将被实施，以利用这种材料的行为。这项研究将大大增加这一新兴材料特性的科学知识基础。这项研究有几个更广泛的影响。 首先，改进的故障预测方法将通过减少新产品的上市时间和更积极的产品设计来造福整个社会，这将降低组件的重量和成本。研究生也将受益于与工业合作伙伴作为暑期实习生的潜力。此外，这项研究的结果将直接融入课程材料，从而影响学生的教育。最后，为了确保这项研究的结果有效地传播到各行业，将在美国铝业公司举办一系列讲习班。