Micromechanical Testing and Multivariant Model Correlation for Shape Memory Alloys

形状记忆合金的微机械测试和多变量模型关联

• 批准号: 9908368
• 负责人: Lynda Brinson
• 金额: $ 4.33万
• 依托单位: Northwestern University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1999
• 资助国家: 美国
• 起止时间: 1999-06-01 至 2001-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9908368&HistoricalAwards=false
• 关键词: Micromechanical; Testing; Multivariant; Model; Correlation

9908368BrinsonIn the work, shape memory alloy (SMA) response to uniaxial and multiaxial loading will be studied with Scanning Electron Microscopy and Electron BackScattered Diffraction. The experiments will provide detailed information on the evolution of variants under different loading conditions and will be compared to the PIs "multivariant" micromechanics model. In addition, results will give insight into the assumptions for transformation strains used in plasticity-based SMA constitutive models. The work represents investigation of aspects of SMA behavior that have not yet been examined: while the materials science community has dealt with identification of martensitic variant structure, and the mechanics community has dealt with macroscale modeling, a direct understanding of exactly which variants form under applied load and precisely how that translates into macroscopic strain for different loading conditions has not been studied. Yet these issues must be understood to make significant progress in SMA research and applications.

在这项工作中，形状记忆合金（SMA）对单轴和多轴载荷的响应将通过扫描电子显微镜和电子背散射衍射进行研究。实验将提供在不同载荷条件下变异体演化的详细信息，并将与pi的“多变异体”微观力学模型进行比较。此外，结果将深入了解基于塑性的SMA本构模型中使用的转换应变的假设。这项工作代表了对SMA行为尚未被研究的方面的调查：虽然材料科学界已经处理了马氏体变异结构的识别，力学界已经处理了宏观尺度的建模，但对于在施加载荷下形成哪些变异以及如何准确地将其转化为不同载荷条件下的宏观应变的直接理解尚未得到研究。然而，要在SMA研究和应用中取得重大进展，必须了解这些问题。