On the opening profile and near tip fields of an interface crack between a polymeric hydrogel and a rigid substrate
On the opening profile and near tip fields of an interface crack between a polymeric hydrogel and a rigid substrate
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聚合物水凝胶和刚性基底之间界面裂纹的开口轮廓和近尖端场
DOI：
10.1016/j.engfracmech.2015.12.029
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发表时间：
2016-03
影响因子：
5.4
通讯作者：
Zhongmin Xiao
中科院分区：
文献类型：
--
作者：
Jiaxin Guo;Jun Luo;Zhongmin Xiao
用有限元方法研究了平面应变情况下聚合物水凝胶与刚性衬底界面裂纹的张开轮廓和尖端应力场。由Hong等人提出的本构模型。(2008)是通过使用ABAQUS中的用户子程序来模拟水凝胶的化学-机械耦合行为来实现的。考虑了裂纹尖端的两种界面模型，即完全粘结(完全钉扎)界面模型和粘结界面模型。我们的数值结果表明，在拉伸载荷作用下，水凝胶中的溶剂分子倾向于聚集在裂纹尖端附近，并引入额外的膨胀，这影响了界面裂纹的张开轮廓和近端场。对于完全钉扎的界面模型，自由膨胀伸长率的增加可能会阻碍裂纹面的翻转。裂纹尖端前方的主要应力分量与界面裂纹的张开轮廓密切相关。利用粘聚区模型研究了界面损伤对界面裂纹张开轮廓的影响。研究表明，界面的本征性质对界面裂纹的张开轮廓有很大影响。
The opening profile and near tip stress fields of an interface crack between a polymeric hydrogel and a rigid substrate in the plane strain case are studied with the finite element method. The constitutive model proposed by Hong et al. (2008) is implemented by using a user subroutine in ABAQUS to simulate the chemo-mechanical coupling behavior of the hydrogel. Two interface models in front of the crack tip are considered, i.e., a perfectly bonded interface (fully pinned) model and a cohesive interface model. Our numerical results show that, when subjected to a tensile load, the solvent molecules in the hydrogel tend to concentrate around the crack tip and introduce extra swelling, which influences the opening profile and near-tip fields of the interface crack. For the fully pinned interface model, an increase of the free swelling stretch may hinder the flipping over of the crack face. The dominant stress component in front of the crack tip is closely related to the opening profile of the interface crack. The effect of interface damage on the opening profile of the interface crack is also studied in this paper with the aid of the cohesive zone model. Our study indicates that the intrinsic properties of the interface have significant influences on the opening profile of the interface crack.
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