Adhesion of a rigid punch to a confined elastic layer revisited
Adhesion of a rigid punch to a confined elastic layer revisited
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DOI：
10.1080/00218464.2017.1381603
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发表时间：
2019-01-02
影响因子：
2.2
通讯作者：
Kossa, Attila
中科院分区：
文献类型：
--
作者：
Hensel, Rene;McMeeking, Robert M.;Kossa, Attila
研究了冲头与线弹性约束层的粘附性。通过数值分析，确定了考虑层间约束的等效弹性模数。发现层相对于冲头半径的大小和泊松比对层的刚度有影响。结果表明，高约束层的等效弹性模量取决于泊松比，而非约束层只对弹性膜的大小敏感。用解析函数对模拟得到的当量模量解进行了拟合，并用线弹性断裂力学方法推导出凸模脱离时的能量释放率。能量释放率随着层的限制而变化很大。可以确定稳定和不稳定裂纹扩展的区域，而这些区域又与界面应力分布相关，以区分不同的剥离机制。
The adhesion of a punch to a linear elastic, confined layer is investigated. Numerical analysis is performed to determine the equivalent elastic modulus in terms of layer confinement. The size of the layer relative to the punch radius and its Poisson's ratio are found to affect the layer stiffness. The results reveal that the equivalent modulus of a highly confined layer depends on its Poisson's ratio, whereas, in contrast, an unconfined layer is only sensitive to the extent of the elastic film. The solutions of the equivalent modulus obtained from the simulations are fitted by an analytical function that, subsequently, is utilized to deduce the energy release rate for detachment of the punch via linear elastic fracture mechanics. The energy release rate strongly varies with layer confinement. Regimes for stable and unstable crack growth can be identified that, in turn, are correlated to interfacial stress distributions to distinguish between different detachment mechanisms.