Effect of strain and strain rate path on damage and fracture in light weight sheet and tube

拟议的研究将提供一个迫切需要的重点，以促进基础材料和力学研究的发展，所需的基础材料和力学研究需要开发与汽车车身部件的冲压和液压成形相关的大变形条件下的材料响应模型以及它们在碰撞条件下的使用性能。这项研究将看到最先进的延性断裂过程模型的发展以及材料在高应变率条件下的响应。重点将放在汽车冲压和液压成形应用的轻质板材和管材的设计、加工和使用性能上。我们的目标是优化可制造性，再加上最优的最终在役性能，以获得卓越的整体性能。这项研究的核心是需要了解材料在产品制造过程中的大应变变形条件下的行为，以及在汽车碰撞事件中经历的极端加载期间的行为。据报道，拟议的Discovery Grant研究，加上申请人最近获得的加拿大研究教席，代表了一系列更大的工业资助项目(每年约为100万美元)中的核心材料和力学研究，这些项目将支持这一核心科学的直接应用和向行业转移。申请人拥有主要的基础设施，如冲压、液压成形、弯管、电磁成形、冲击试验和高应变率材料表征，因此非常适合从事这项研究。

The proposed research will provide a critically-needed focus for the advancement of the basic material and mechanics research required to develop models of material response under the gross deformation conditions associated with stamping and hydroforming of automotive body components and their in-service performance under crash conditions. The research will see development of state-of-the-art models of the ductile fracture process and the response of materials under high strain rate conditions. The focus will be on the design, processing and in-service performance of light weight sheet and tube for automotive stamping and hydroforming applications. The goal is optimization of manufacturability, coupled with optimal final in-service properties to obtain superior overall performance. Central to this research is the need to understand the behaviour of materials under the large-strain deformation conditions during product manufacture, as well as during the extreme loading experienced during an automotive crash event.      The proposed Discovery Grant research, coupled with a recently awarded Canada Research Chair held by the applicant, represents the core materials and mechanics research within a larger suite of industrially-funded projects (amounting to roughly $1M annually) that will support the direct application and transfer of this core science to industry. The applicant is well placed to undertake this research with major infrastructure for stamping, hydroforming, tube bending, electromagnetic forming, impact testing and high strain rate material characterization.