An Integrated Micromechanics Approach to Physics-Based Modeling of Deformation and Failure of Superelastic Materials

基于物理的超弹性材料变形和失效建模的集成微力学方法

• 批准号: 0409294
• 负责人: Panayiotis Papadopoulos
• 金额: $ 30万
• 依托单位: University of California-Berkeley
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2004
• 资助国家: 美国
• 起止时间: 2004-07-01 至 2008-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0409294&HistoricalAwards=false
• 关键词: Integrated; Micromechanics; Approach; Physics; Based

An Integrated Micromechanics Approach to Physics-basedModeling of Deformation and Failure of Superelastic MaterialsP. Papadopoulos and R.O. RitchieThe objective of the proposed work is to develop an integrated experimental,theoretical and computational description of the deformation, fracture and cyclic fatigue behavior of polycrystalline superelastic/shape-memory alloys. Intellectual Merit: The proposed work seeks to characterize the mechanical behavior of a complextextured material that undergoes a series of solid-solid phase transitions, which crucially affect its multiaxial stress-strain response and its fatigue characteristics. The intellectual merit of the research stems from the challenging questions that it addresses and from the integrated nature(experiments, theory, computing) of the proposed methodologies. Broader Impact: Superelastic alloys are experiencing an explosive growth in use, mostly inbiomedical devices, but also in a number of other civilian and militaryapplications. As an example, the cardiovascular stent industry in 2003 is estimated at 5 billion dollars per year in the US alone and superelasticNi-Ti alloys are fast becoming the principal material for these stents. At the same time, there exist significant uncertainties regarding the mechanical response of such alloys, especially under multiaxial loading and cyclic fatigue. The proposed research intends to address these uncertainties, thus contributing to the safer and more rational use of these materials in engineering practice.

基于物理的超弹性材料变形与破坏模型的综合细观方法Papadooulos和R.O.Ritchie拟议工作的目标是开发一种关于多晶超弹性/形状记忆合金的变形、断裂和循环疲劳行为的综合实验、理论和计算描述。智能优点：拟议的工作旨在表征复杂材料的力学行为，该材料经历了一系列固体-固体相变，这些相变对其多轴应力-应变响应和疲劳特性具有至关重要的影响。这项研究的学术价值来自于它所解决的具有挑战性的问题，以及拟议方法的综合性质(实验、理论、计算)。更广泛的影响：超弹性合金的使用正在经历爆炸性的增长，主要是在生物医学设备中，但也在许多其他民用和军事应用中。例如，2003年，仅在美国，心血管支架行业的年销售额估计就达到50亿美元，超弹性镍钛合金正迅速成为这些支架的主要材料。同时，这类合金的力学响应存在很大的不确定性，特别是在多轴载荷和循环疲劳下。拟议的研究旨在解决这些不确定性，从而有助于在工程实践中更安全和更合理地使用这些材料。