Viscoplastic Compaction of Non-Spherical Particle Aggregates

非球形颗粒聚集体的粘塑性压实

• 批准号: 0084902
• 负责人: Paul Heyliger
• 金额: $ 4.15万
• 依托单位: Colorado State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2000
• 资助国家: 美国
• 起止时间: 2000-09-01 至 2002-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0084902&HistoricalAwards=false
• 关键词: Viscoplastic; Compaction; Non; Spherical; Particle

0084902HeyligerThe purpose of this research is to study and model the 2-D compaction of aggregates of non-spherical viscoplastic particles under external load. A numerical model will be used in which each particle is treated individually, with the appropriate constitutive relations, kinematic conditions, contact restraints, and elimination of overlap satisfied for every particle in the aggregate. The model will be used to study the effects of particle shape, size, distribution, orientation, and compaction history on the macro behavior of viscoplastic powders during and after compaction. The results are expected to provide new insight into the fundamental behavior of granular media, including overall aggregate stress-strain response, the formation and evolution of force chains, and the nature of yield surfaces for precompacted aggregates. The results will be useful in a wide variety of problems that can be represented using granular media, such as polymers, aluminum, food products, and others.

0084902 Heyliger本研究的目的是研究和模拟非球形粘塑性颗粒聚集体在外部载荷下的二维压实。 将使用一个数值模型，其中每个颗粒被单独处理，适当的本构关系，运动学条件，接触约束，并消除重叠满足每个颗粒在聚集体。 该模型将被用来研究颗粒形状，尺寸，分布，取向和压实历史的粘塑性粉末的宏观行为在压实过程中和压实后的影响。 研究结果有望为颗粒介质的基本行为提供新的见解，包括整体骨料的应力-应变响应，力链的形成和演变，以及预压骨料屈服面的性质。 结果将是有用的，在各种各样的问题，可以表示使用颗粒介质，如聚合物，铝，食品，和其他。