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

摘要纳米复合材料是一类在纳米尺度上具有一个或多个相的特殊复合材料，具有独特的力学性能，在各个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了解其纳米结构-宏观性能关系的基础。本文的目的是从纳米尺度的微观结构出发，从多尺度的角度探讨铝铝增强非晶纳米复合材料的整体本构关系。纳米复合材料的整体强化和变形行为将从纳米力学框架和均匀化过程进行研究。具体来说，整体力学性能对纳米颗粒尺寸的依赖将被特别强调。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被阐述。所提出的多尺度模型适用于一般的三维加载条件。本文提出的研究成果将在纳米尺度上直接确定材料结构-性能关系的内在机制。此外，它将为在纳米结构材料的新兴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对学生在这些领域的职业教育和培训方式进行根本性的改变。

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.