松弛时间对高聚物复合材料界面强度的影响

Effect of relaxation time on interfacial debonding strength in a polymeric composite

本文探究了基体松弛时间与颗粒填充高聚物复合材料强度的关系.通过选取球形胞体作为代表体积单元(RVE)进行研究,分析了颗粒界面开裂所需要的能量.进一步研究了以刚性球形颗粒填充复合材料的界面开裂机理,并通过施加位移载荷来引入松弛时间,探究了基体松弛时间对界面脱粘强度的影响变化规律.同时,选取不同参数讨论了颗粒尺寸、粒子体积分数、基体模量和泊松比等参量对界面强度的影响.研究结果表明:当高聚物基体材料为Maxwell模型粘弹性材料、夹杂为球形刚体材料时,松弛时间越长,基体粘性越小,界面强度越高.

The relationship between relaxation time of matrix and interface strength of po lymer filled particles is investigated in this study.The energy required to interfacial debonding is analyzed by studying on spherical cell body in which the representative volume element(RVE)is selected.Next,the interfacial cracking mechanism of rigid spherical particles filled with composites is probed.Further investigation is conducted on the influences of relaxation time of matrix on interfacial strength.In addition,the effect of the particles size,the modulus and Pois son’s ratio of matrix,particle volume fraction on the interfacial strength are also discussed.The conclusion can be reached that the interfacial debonding strength decreases with the relaxation time,and particle turns out to be less prone to interfacial debonding when the matrix is conformed to the Maxwell model with inclusions of spherical and rigid material.