含韧性界面相的颗粒增强复合材料的损伤研究  

INCREMENTAL DAMAGE THEORY OF PARTICULATE-REINFORCED COMPOSITES WITH A DUCTILE INTERPHASE

作　　者：杨慧[1] 

机构地区：[1]上海工程技术大学航空运输学院,上海201620

出　　处：《机械强度》2015年第4期735-741,共7页Journal of Mechanical Strength

基　　金：上海工程技术大学科研启动基金项目资助(E1-0501-14-0128)资助

摘　　要：基于增量损伤理论,提出一个可描述颗粒增强复合材料渐进式脱粘损伤、基体塑性变形及颗粒尺寸效应的本构模型。采用双夹杂模型将韧性界面相嵌入到增量损伤理论模型,用界面分离的能量平衡式来描述颗粒增强复合材料的渐进式脱粘损伤。该模型可研究颗粒尺寸效应和界面性能对复合材料应力-应变关系的影响,并可解释界面相对复合材料力学性能的颗粒尺寸效应的影响。This paper deals with a new micromechanics model of particulate- reinforced composites（ PRCs） which can describe the evolution of debonding damage,matrix plasticity and particle size effect on the deformation. Based on the preceding researches,a ductile interphase was considered in the frame of incremental damage theory to describe the dependence of elasticplastic-damage behavior on particle size. Progressive damage was controlled by a critical energy criterion for particle-matrix interfacial separation. The equivalent stresses of the matrix and interphase were determined by field fluctuation method. The influences of progressive debonding damage,particle size and interphase properties on the overall stress-strain response of PRC were analyzed. Due to the existence of a ductile interphase, stress transfer and plastic initiation in PRC become very complicated,and a unit-cell（ UC） based FEM was used to understand their evolution and demonstrate the role of the interphase.Finally,particle size effect on the mechanical behaviors of composites was interpreted.

关 键 词：颗粒增强复合材料 脆性界面相 有限元方法 脱粘损伤 

分 类 号：TB332[一般工业技术—材料科学与工程]