材料科学
复合材料
壳体(结构)
芯(光纤)
有限元法
应变硬化指数
压缩(物理)
拉伤
应力-应变曲线
压力(语言学)
硬化(计算)
可塑性
结构工程
变形(气象学)
工程类
哲学
内科学
医学
图层(电子)
语言学
作者
Ruben Mercadé‐Prieto,Rachael Allen,Zhibing Zhang,David York,Jon A. Preece,Ted E. Goodwin
出处
期刊:Aiche Journal
[Wiley]
日期:2011-12-02
卷期号:58 (9): 2674-2681
被引量:34
摘要
Abstract Characterization of the failure behavior of microcapsules is extremely important to control the release of their core actives by mechanical forces. The strain and stress of elastic‐plastic uninflated core–shell microcapsules at failure (rupture or bursting) has been determined using finite element modeling (FEM) and micromanipulation compression experiments. The ductile failure of polymeric microcapsules at high deformations is considered to occur when the maximum strain in the shell exceeds a critical strain, resulting in their rupture. FEM has been used to determine the maximum strains present in the capsule wall at different deformations for three types of shell material: elastic, elastic—perfectly plastic and elastic—perfectly plastic with strain hardening at large strains. The results obtained were used to determine the failure strain and stress of melamine‐formaldehyde microcapsules, with average population values of ∼0.48 and ∼350 MPa, respectively. Thus, the elastic‐plastic stress–strain relationship has been determined for the core–shell microcapsules tested. © 2011 American Institute of Chemical Engineers AIChE J, 2012
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