Collaborative Proposal: Bridging and Coupling Particle to Continuum Length-Scale Mechanics for Simulating Deformation and Flow of Dense Dry Particulate Materials

合作提案：将颗粒桥接和耦合到连续长度尺度力学，用于模拟致密干燥颗粒材料的变形和流动

• 批准号: 0700484
• 负责人: Youssef Hammi
• 金额: $ 5.31万
• 依托单位: Mississippi State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2007
• 资助国家: 美国
• 起止时间: 2007-10-01 至 2011-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0700484&HistoricalAwards=false
• 关键词: Collaborative; Proposal; Bridging; Coupling; Particle

Particulate materials remain a class of materials not mastered with regard to modeling computationally their spectrum of mechanical behavior in a physically-based manner across several orders of magnitude in length-scale. Particulate materials may transition in an instant from deforming like a solid to flowing like a fluid or gas and vice versa. It is not feasible to simulate computationally the heterogeneous, localized deformation, and flow response in the engineering application of interest involving particulate materials using a pure particle-based materials modeling approach (such as DEM).Intellectual merit: The project seeks to overcome this limitation in scale-representation of particulate materials by the development of a computational multiscale modeling approach and its calibration/ validation against micro to macro-scale experiments. In doing so, the proposed effort will 1) provide physical insight into the deposition and compaction of metallic powders into complex die shapes and the potential mechanisms leading to non-uniform density after compaction; and 2) determine the redistributed state of sand particles in the vicinity of a rigid penetrating object.Broader impacts include (i) transfer of innovative computational multiscale modeling technology to the automotive industry through CAVS for improving the manufacture of near net-shape components of extremely complex geometries and various unforeseen alloy material systems; (ii) recruitment of underrepresented minorities in the engineering disciplines; and (iii) sharing of experimental and computational advances and physical insight gained with the technical and student communities.

颗粒材料仍然是一类没有掌握的材料，在计算上以基于物理的方式模拟其在长度尺度上的几个数量级的力学行为谱。颗粒材料可以在瞬间从固体变形转变为流体或气体流动，反之亦然。在涉及颗粒材料的工程应用中，使用纯基于颗粒的材料建模方法(如DEM)来计算模拟非均匀的、局部的变形和流动响应是不可行的。智力优势：该项目试图通过开发计算多尺度建模方法及其针对微观到宏观尺度实验的校准/验证来克服颗粒材料尺度表示方面的限制。在此过程中，拟议的工作将1)提供对金属粉末沉积和压实成复杂模具形状以及导致压实后密度不均匀的潜在机制的物理洞察；以及2)确定刚性渗透对象附近沙粒的重新分布状态。广泛的影响包括(I)通过CAVS向汽车行业转让创新的计算多尺度建模技术，以改进极其复杂几何形状和各种不可预见的合金材料系统的近净形状部件的制造；(Ii)在工程学科招募未被充分代表的少数群体；以及(Iii)与技术和学生社区分享实验和计算进展以及获得的物理见解。