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本实验和理论分析导电材料中电磁场和机械场之间的相互作用产生很高的力和很高的温度，并使重要的实际应用成为可能，例如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-机械现象的复杂性质，还没有从力学的角度进行系统研究的对象。拟议工作的目标是系统地研究电磁加载现象，预计将有助于：a）使用基本实验表征结构金属在EMF条件下的本构响应，以及：B）建立这些过程所需的建模能力，并通过真实的实时进行全场应变测量的实验进行验证。所提出的研究将实现有用的新技术，因为EMF工艺具有快速、低浪费和环境友好的工艺的优点，用于由难以通过常规方法成形的合金制造零件。电子和能量存储技术的最新进展使得EMF技术成熟用于大规模生产，并且用于汽车工业的燃料电池板和管状框架的大规模制造的计划正在进行中。对这一过程的基本理解将通过与感兴趣的行业建立联系以促进这种过渡，从而大大推动EMF的使用走向大规模应用。此外，教育和培训不同群体的研究生是这项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.