Critical particle size for interfacial debonding in polymer/nanoparticle composites
Critical particle size for interfacial debonding in polymer/nanoparticle composites
复制标题
聚合物/纳米颗粒复合材料界面脱粘的临界粒径
DOI：
10.1016/j.compscitech.2010.02.004
复制
发表时间：
2010-05-01
影响因子：
9.1
通讯作者：
Mai, Yiu-Wing
中科院分区：
文献类型：
--
作者：
Chen, Jian-kang;Wang, Gong-Tao;Mai, Yiu-Wing
用细观力学方法研究了聚合物/纳米颗粒复合材料在单轴载荷作用下的界面脱粘，得到了嵌入在无限大基质中的单个椭球粒子脱粘前后的应力应变阶跃差，由能量分析导出了脱粘判据，并讨论了界面粘结强度与组分粘附功、颗粒形状和尺寸以及两组分的力学性能的关系。对于两种特殊情况，计算了临界颗粒尺寸，其定义为不会发生界面脱粘的尺寸。球形和便士状颗粒的临界尺寸取决于粘附功的绝对值，粘附力范围为0.01-0.40J/m(2)，球形颗粒的临界半径从几十纳米到几百纳米不等，但对于与其表面平行加载的便士形颗粒，临界颗粒尺寸至少为几微米，长径比为100(C)2010爱思唯尔有限公司保留所有权利
Interfacial debonding in polymer/nanoparticle composites under uniaxial loading is studied using meso-mechanics By means of Eshelby's equivalent inclusion method, the step differences of stress and strain Just before and after the debonding for a single ellipsoidal particle embedded in an infinite matrix are obtained The debondmg criterion is derived from an energetic analysis Then, the relationships between the interfacial adhesion strength and the work of adhesion of the components, the shape and size of the particle, and the mechanical properties of both constituents are discussed. The critical particle size, defined as that size below which no interface debondmg can occur, is calculated for two special cases. spherical and penny-shape particles It is shown that this critical size depends on the absolute value of the work of adhesion In the adhesion range of 0 01-0 40 J/m(2), the critical radius of a sphere particle varies from tens to several hundreds of nanometers However, for a penny-shape particle with loading parallel to its faces, the critical particle size is at least several micrometers for an aspect ratio of 100 (C) 2010 Elsevier Ltd All rights reserved