The macroscopic constitutive relation of particulate-reinforced polymer

By means of micromechanics and statistical method; the non-linear consitutive relation of particulate-reinforced polymer is studied. In the deformation process, the debonding damage of the particle-matrix interface may occur and will lead to microvoid nucleation. The statistical behavior of microvoids' nucleation and evolution are investigated by using Eshelby's equivalent inclusion method and Mori-Tanaka's mean stress field concept. The stiffness of the material will decrease due to microvoid evolution and the macroscopic constitutive relation will gradually be changed from linear one to nonlinear one. Such a phenomenon, on the other hand, shows that the material may be toughened. The reinforcing effect due to intact rigid particles and the weakening effect due to microvoids evolution, as well as their coupling effect on the macroscopic constitutive relations are studied in this paper. The influences of interface strength particle-size dispersity, and average particle-size on the macroscopic constitutive relation are also discussed. The research results indicate that higher interface strength, lower particle size dispersity, and smaller average particle size will be effective for reinforcing and toughening polymer materials under the condition that matrix strength is higher than interface strength.Polymer ScienceSCI(E)中文核心期刊要目总览(PKU)中国科学引文数据库(CSCD)06714-71