Specimen Thickness Dependency of Energy Release Rate of a Gelatin Hydrogel and Glass Substrate Interface
Specimen Thickness Dependency of Energy Release Rate of a Gelatin Hydrogel and Glass Substrate Interface
复制标题
明胶水凝胶和玻璃基板界面能量释放速率的样本厚度依赖性
DOI：
10.1115/1.4041364
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发表时间：
2018
期刊：
影响因子：
--
通讯作者：
A. Singh
中科院分区：
文献类型：
--
作者：
A. Thakre;A. Singh
橡胶、弹性体和凝胶等软固体是重要的聚合材料。更好地了解它们的界面特性，如摩擦和粘合，对于各种技术应用是至关重要的。由于实验观察到，即使在不改变软固体含量的情况下，界面性质也可以被改变，在直剪实验中，研究了样品厚度对软明胶水凝胶能量释放率(G)的影响。滑动-保持-滑动(SHS)实验表明，随着凝胶试件厚度的增加，剪切强度降低，而相应的裂纹长度增加。然而，静强度、动强度和剩余强度的G随着试件厚度的增加而增加。最后，根据滑动界面的I/II复合型断裂和剪切速率效应解释了这些观测结果。
Soft solids, such as rubbers, elastomers, and gels, are the important polymeric materials. A better understanding of their interfacial properties such as friction and adhesion is critical for variety of technological applications. Motivated by the experimental observation that interfacial properties can be modified even without changing the content of a soft solid, the effect of specimen thickness on the energy release rate (G) of a soft gelatin hydrogel is investigated in direct shear test. Slide-hold-slide (SHS) experiments have shown that shear strength decreases, while corresponding crack length increases, with increase in thickness of gel specimens. However, G at static, dynamic and residual strengths increase with specimen thickness. At the end, these observations are explained in light of mixed mode I/II fracture and shear rate effects at the sliding interface.