当前位置: X-MOL 学术Mech. Mater. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Numerical derivation of a normal contact law for compressible plastic particles
Mechanics of Materials ( IF 3.4 ) Pub Date : 2020-07-01 , DOI: 10.1016/j.mechmat.2019.103297
B.D. Edmans , I.C. Sinka

Abstract A new contact law is proposed to describe the behaviour of plastically compressible particles. The law was derived from contact simulations in which a general continuum constitutive model, the von Mises Double Cap (VMDC) model, was introduced to represent the particle material behaviour, allowing distinct dilatory, shearing and densification plastic flow regimes. Elastic and plastic properties were prescribed as functions of density. Parametric studies were conducted covering the parameter space of published experimental data for a range of pharmaceutical powders and granules. The analysis showed plastic zones corresponding to the three flow regimes developing within the particle, with size, shape, location and onset conditions being dependent on the strength ratios of the constitutive model. The contact law established combines an initial quasi-linear region followed by an exponential hardening region, arising from the initiation, growth and hardening of plastic zones, and the development of dense and stable load-bearing structures within the particle. The outcome of these studies is a new contact law, relationships for predicting contact law parameters from material parameters for both loading and unloading, and guidelines for the analytical treatment of plastic compressibility in particle contact. The contact law can be employed in discrete element and homogenisation models to predict macroscopic properties of porous granular materials, while the analytical framework and qualitative findings can be used in the design of granules.

中文翻译:

可压缩塑料粒子法向接触定律的数值推导

摘要 提出了一种新的接触定律来描述可塑性可压缩粒子的行为。该定律源自接触模拟,其中引入了一般连续本构模型 von Mises 双帽 (VMDC) 模型来表示颗粒材料行为,允许不同的膨胀、剪切和致密塑性流动状态。弹性和塑性特性被规定为密度的函数。对一系列药物粉末和颗粒的已发表实验数据的参数空间进行了参数研究。分析显示对应于颗粒内发展的三种流态的塑性区,其尺寸、形状、位置和起始条件取决于本构模型的强度比。建立的接触定律结合了初始准线性区域和指数硬化区域,由塑性区的萌生、生长和硬化以及颗粒内致密和稳定的承载结构的发展产生。这些研究的结果是新的接触定律、根据加载和卸载的材料参数预测接触定律参数的关系,以及颗粒接触中塑性压缩性分析处理的指南。接触定律可用于离散元和均质模型以预测多孔颗粒材料的宏观特性,而分析框架和定性结果可用于颗粒设计。塑性区的生长和硬化,以及颗粒内致密和稳定的承载结构的发展。这些研究的结果是新的接触定律、根据加载和卸载的材料参数预测接触定律参数的关系,以及颗粒接触中塑性压缩性分析处理的指南。接触定律可用于离散元和均质模型以预测多孔颗粒材料的宏观特性,而分析框架和定性结果可用于颗粒设计。塑性区的生长和硬化,以及颗粒内致密和稳定的承载结构的发展。这些研究的结果是新的接触定律、根据加载和卸载的材料参数预测接触定律参数的关系,以及颗粒接触中塑性压缩性分析处理的指南。接触定律可用于离散元和均质模型以预测多孔颗粒材料的宏观特性,而分析框架和定性结果可用于颗粒设计。从加载和卸载的材料参数预测接触定律参数的关系,以及颗粒接触中塑性压缩性的分析处理指南。接触定律可用于离散元和均质模型以预测多孔颗粒材料的宏观特性,而分析框架和定性结果可用于颗粒设计。从加载和卸载的材料参数预测接触定律参数的关系,以及颗粒接触中塑性压缩性的分析处理指南。接触定律可用于离散元和均质模型以预测多孔颗粒材料的宏观特性,而分析框架和定性结果可用于颗粒设计。
更新日期:2020-07-01
down
wechat
bug