Collaborative Research: Fundamental Experimental and Theoretical Investigation of Finite Strain and High Strain-Rate Electromagnetic Loading Processes in Metals

塑性金属中有限应变、高应变率电磁加载过程的基础实验和理论研究导电材料中电磁场和机械场的相互作用产生高力和高温，并使重要的实际应用成为可能，例如用于高速成形板材的电磁成形(EMF)方法。在这些快速过程中发生的电磁和热-机械耦合现象的复杂性，并不是从力学的角度进行系统研究的对象。这项拟议工作的目标是对电磁加载现象进行系统的研究，这将有助于：a)利用基础实验表征结构金属在电动势条件下的本构响应，以及：b)建立此类过程所需的建模能力，并通过实验验证，其中将实时执行全场应变测量。拟议的研究将实现一项有用的新技术，因为电动势工艺具有快速、低浪费和环境友好的优点，用于制造难以通过传统方法成形的合金零件。电子技术和储能技术的最新进展使电动势技术适合大规模生产，汽车工业的燃料电池板和管状框架的大规模制造计划正在顺利进行中。对这一过程的基本了解将通过与感兴趣的行业建立的联系，极大地推动电动势的大规模应用，以促进这种过渡。此外，对不同的研究生群体进行教育和培训是这项提议的组成部分。

FUNDAMENTAL EXPERIMENTAL AND THEORETICAL INVESTIGATIONS OF FINITE STRAIN, HIGH-STRAIN RATE ELECTROMAGNETIC LOADING PROCESSES IN DUCTILE METALSInteraction between electromagnetic and mechanical fields in electrically conducting materials generates high forces and large temperatures, and enables important practical applications, such as the Electromagnetic Forming (EMF) method for shaping sheet metals at high-velocity. The complex nature of the coupled electromagnetic and thermo-mechanical phenomena that occur during these rapid processes, have not been the object of a systematic study from the mechanics standpoint. The goal of the proposed work is a systematic investigation of electromagnetic loading phenomena, which is expected to help: a) characterize, using fundamental experiments, the constitutive response of structural metals under EMF conditions and: b) establish the modeling capability required for such processes, and validate with experiments in which full field strain measurements will be performed in real time.The proposed study will enable a useful new technology, since the EMF process has the advantage of being a rapid, low-waste and environmentally friendly process for manufacturing parts out of alloys that are difficult to shape through conventional means. Recent advances in electronics and energy storage technology make EMF technology ripe for mass production, and plans are well under way for the large scale manufacturing of fuel cell plates and tubular frames for the automotive industry. The fundamental understanding of this process will significantly push the use of EMF towards large-scale applications through links that have been established with interested industry to facilitate such transition. Furthermore, education and training of a diverse group of graduate students is an integral part of this proposal.