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

这个与工业界联系的资助机会（GOALI）研究项目的目标是通过实验和分析来表征板材的应力失效准则；将该准则纳入板料成形过程的有限元模型；并通过工艺创新来开发材料现象。以往的研究表明，基于应力的破坏准则与路径无关，或者至少对变形路径的敏感性低于常用的基于应变的破坏准则。首先，将使用双轴试验装置表征高级合金的应力破坏准则。利用这些实验数据，将开发分析和数值模型，以帮助设计师确定正确的工艺变化，以防止撕裂问题。最后，将实施深拉伸和拉伸成形的工艺创新，以利用这种材料行为。这项研究将显著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缩短新产品的上市时间和更积极的产品设计，从而减少部件的重量和成本，从而使整个社会受益。研究生也将受益于作为暑期实习生与工业合作伙伴一起工作的潜力。此外，本研究的结果将直接整合到课程教材中，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给各行业，将在美国铝业公司举办一系列讲习班。

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.