Fracture mechanics of a self-healing hydrogel with covalent and physical crosslinks: A numerical study
Fracture mechanics of a self-healing hydrogel with covalent and physical crosslinks: A numerical study
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DOI：
10.1016/j.jmps.2018.03.009
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发表时间：
2018-11-01
影响因子：
5.3
通讯作者：
Hui, Chung-Yuen
中科院分区：
文献类型：
--
作者：
Guo, Jingyi;Liu, Mincong;Hui, Chung-Yuen
本文研究了具有化学交联和物理交联网络的聚乙烯醇（PVA）水凝胶中静态裂纹的断裂力学。作者先前的研究表明，这种凝胶的时间依赖性应力应变行为可以非常准确地捕获与3D，大变形的非线性粘弹性模型的基础上物理交联的断裂动力学。利用该模型和一种新的时间积分方法研究了单边裂纹试样中静止裂纹尖端附近的应力场和变形场。理论和有限元结果与实验观察到的裂纹张开轮廓吻合得非常好。对于松弛试验的特殊情况，在主要平面应力条件下加载的试样中得到了精确的渐近裂纹尖端解。(C)2018由Elsevier Ltd.出版
The fracture mechanics of a stationary crack in a Poly(vinylalcohol) (PVA) hydrogel with a network consisting of chemical and physical crosslinks is studied here. Prior research by the authors has shown that the time-dependent stress strain behavior of this gel can be captured very accurately with a 3D, large deformation nonlinear viscoelastic model based on breaking kinetics of physical crosslinks. This model is used together with a novel time integration scheme to study the stress and deformation fields near the tip of a stationary crack in single edge cracked specimens. The theoretical and finite element results agree remarkably well with experimentally observed crack opening profiles. For the special case of relaxation tests exact asymptotic crack tip solutions are obtained in specimens loaded under predominantly plane stress conditions. (C) 2018 Published by Elsevier Ltd.