Phase Transformations Under Pressure Loadings

本研究主要是一项实验工作，旨在进一步了解高压和循环加载下合金钢中应力和应变诱导的相变。压力加载允许隔离静水应力和主应力对转换的影响，并产生均匀的应力场，允许对应力和应变效应进行明确的解释。循环加载改变了内部结构，与单向加载相比会产生不同的变形行为。基于实验结果验证的本构模型的发展是力学与材料专业的重中之重。因此，本提案中包含的相变实验研究对于建立数据库非常重要，在建立强大的理论成分基础之前，这些数据库是必不可少的。所提出的工作将促进微观和力学的相变在材料系统的理解。＊＊＊

9414525 Sehitoglu This research is primarily an experimental effort to further the understanding of stress- and strain-induced phase transformations under high pressures and cyclic loading in alloy steels. Pressure loading permits isolation of hydrostatic stress and principle stress effects on transformations and produces homogeneous stress fields allowing unambiguous interpretation of stress and strain effects. Cyclic loading modifies the internal structure and will generate different transformation behavior compared to unidirectional loading. The development of constitutive models based on a verified by well characterized experimental results is a very high priority in the Mechanics and Materials Program. Therefore, the experimental study of phase changes contained in this proposal is very important for establishing the data base that is required before the foundation for a strong theoretical component can be established. The proposed work will advance both the micro- and mechanical understanding of phase transformations in material systems. ***