Viscoplastic Compaction of Non-Spherical Particle Aggregates

本研究的目的是研究非球形粘塑性颗粒集合体在外载荷作用下的二维压实过程，并建立模型。将使用一个数值模型，其中每个粒子被单独处理，具有适当的本构关系、运动学条件、接触约束和对聚集中的每个粒子满足的重叠消除。该模型将用于研究颗粒形状、大小、分布、取向和压制历史对粘塑性粉末在压制过程中和压制后的宏观行为的影响。这些结果有望为颗粒介质的基本行为提供新的见解，包括总体集料应力-应变响应，力链的形成和演化，以及预压实集料屈服面的性质。这些结果将有助于解决可以使用颗粒介质表示的各种问题，例如聚合物、铝、食品和其他。

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.