NER: Multiscale Modeling of Strengthening and Deformation Mechanisms in Aluminum-Based Amorphous Nanocomposites

NER：铝基非晶纳米复合材料强化和变形机制的多尺度建模

• 批准号: 0303955
• 负责人: Lizhi Sun
• 金额: $ 8.04万
• 依托单位: University of Iowa
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2003
• 资助国家: 美国
• 起止时间: 2003-08-01 至 2005-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0303955&HistoricalAwards=false
• 关键词: NER; Multiscale; Modeling; Strengthening; Deformation

NER: Multiscale Modeling of Strengthening and DeformationMechanisms in Aluminum-Based Amorphous NanocompositesLizhi Sun, The University of IowaAbstractNanocomposites are a special class of composite materials with one or more phases on the nanometer scale, resulting in unique mechanical properties and having wide application potential in diverse areas. Developing a multiscale constitutive model for nanocomposites is essential to obtain a fundamental understanding of their nanostructure - macro-property relationships.The objective of this proposal is to explore the overall constitutive relationship of a-Al-reinforced amorphous nanocomposites in terms of a multiscale approach starting from the microstructure at nanoscale. The overall strengthening and deforming behavior of the nanocomposites will be investigated from nanomechanics framework and homogenization procedures. Specifically, the dependence of overall mechanical properties on nanoparticle sizes will be particularly emphasized. Further effects of the nanoparticle concentration, local particle interaction, and interfacial debonding will be formulated. The proposed multiscale model is valid for general three-dimensional loading conditions.The proposed research effort would provide direct determination of the intrinsic mechanisms of material structure-property relationship at the nanoscale. Furthermore, it would provide an opportunity for performing interdisciplinary research and cross-disciplinary education in the emerging field of nanostructured materials. This multidisciplinary nature of the project requires fundamental changes in how students are educated and trained for careers in these fields.

NER：纳米复合材料是一类特殊的复合材料，在纳米尺度上具有一个或多个相，具有独特的力学性能，在不同的领域具有广泛的应用潜力。建立纳米复合材料的多尺度本构模型是理解其纳米结构-宏观性能关系的基础，本研究的目的是从纳米尺度的微观结构出发，探索a-Al增强非晶纳米复合材料的整体本构关系。从纳米力学框架和均匀化过程研究纳米复合材料的整体强化和变形行为。具体而言，将特别强调整体机械性能对纳米颗粒尺寸的依赖性。纳米粒子浓度，局部粒子相互作用，和界面脱粘的进一步影响将制定。所提出的多尺度模型适用于一般的三维加载条件，为在纳米尺度下直接确定材料结构-性能关系的内在机制提供了理论依据。此外，它还将为在新兴的纳米结构材料领域进行跨学科研究和跨学科教育提供机会。该项目的多学科性质要求从根本上改变学生在这些领域的职业教育和培训方式。