高三轴应力条件下粒子填充粘弹性材料的能量耗散

ENERGY DISSIPATION IN PARTICULATE-REINFORCED VISCOELASTIC MATERIALS UNDER THE CONDITION OF HIGH STRESS TRIAXIALITY

研究了微粒填充粘弹性材料在变形过程中的能量耗散。在高三轴度应力条件下,由于同时考虑了界面脱粘引起的损伤,故能量耗散主要可分为两部分1)由基体材料的粘性性质所引起的粘性耗散功;2)由界面全脱粘所引发的界面粘结能的耗散。结合微损伤演化的规律,在忽略惯性效应的前提下,导出了损伤耗散功的一般表达式。利用Mori-Tanaka平均应力场的概念,提出了一种方便地计算材料中的粘性耗散功的近似方法。在此基础上,计算了材料中的粘性耗散功和损伤耗散功,并讨论了加载速率、界面粘结能、基体材料的松弛时间、平均粒径和粒径分散度等对这两种耗散机制的影响。

In this paper, the energy dissipation in particulate-reinforced viscoelastic materials is investigated by means of mesomechanics method. Under the condition of high stress triaxiality, the dissipation can be divided into two parts, i.e., the viscous dissipation energy and the fully interfacial-debonding induced damage dissipation energy. The damage dissipation energy is calculated by neglecting the inertial effect. An approximate method to analyze the viscous dissipation energy is suggested by means of Mori-Tanakas scheme. As an example, the numerical calculations on the two types of dissipation energy are carried out. The effects of loading rate, interfacial adhesive energy, relaxation time of matrix material, average size of particles, and the particle-size dispersity on the energy dissipation are discussed.