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

韧性金属有限应变、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电场的相互作用产生高力和高温度，并使重要的实际应用成为可能，例如用于高速成形金属板的电磁成形（EMF）方法。在这些快速过程中发生的耦合电磁和热机械现象的复杂性，尚未从力学的角度进行系统研究。这项工作的目标是对电磁加载现象进行系统的研究，这有望帮助：a)利用基础实验表征结构金属在EMF条件下的本构响应；b)建立这些过程所需的建模能力，并通过实时进行全场应变测量的实验进行验证。拟议的研究将使一项有用的新技术成为可能，因为电动势工艺具有快速、低浪费和环保的优点，可用于用传统方法难以成型的合金制造零件。电子和能量存储技术的最新进展使EMF技术成熟，可以大规模生产，并且正在计划大规模制造用于汽车工业的燃料电池板和管状框架。对这一过程的基本理解将通过与感兴趣的行业建立的链接极大地推动EMF的大规模应用，以促进这种过渡。此外，多样化的研究生群体的教育和培训是这一建议的一个组成部分。

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.