Nase Julia, Ramos Osvanny, Creton Costantino, Lindner Anke
PMMH, UMR 7636, ESPCI, CNRS, Universités UPMC and Paris-Diderot, 10 rue Vauquelin, 75005, Paris, France,
Eur Phys J E Soft Matter. 2013 Sep;36(9):103. doi: 10.1140/epje/i2013-13103-3. Epub 2013 Sep 19.
We investigated the debonding energy between confined layers of a soft elastic solid (PDMS) and a circular steel indenter in a flat punch geometry. PDMS is extensively used in applications, but also a widespread model system for fundamental research. Varying systematically the pulling speed and the viscoelastic properties, notably the modulus, we determined scaling laws for the debonding energy. We showed that the debonding energy is independent of the sample thickness. Applying a new approach and separating the crack initiation and the propagation part of the force curves, we analyzed the thickness dependence more precisely and we demonstrated that the energy to propagate the crack at given average speed does not only depend on the modulus, but also on the sample thickness.
我们研究了在平冲头几何形状中，软弹性固体（聚二甲基硅氧烷，PDMS）受限层与圆形钢压头之间的脱粘能。PDMS不仅在实际应用中广泛使用，也是基础研究中一种广泛应用的模型体系。通过系统地改变拉伸速度和粘弹性特性，特别是模量，我们确定了脱粘能的标度律。我们表明脱粘能与样品厚度无关。采用一种新方法并分离力曲线的裂纹起始和扩展部分，我们更精确地分析了厚度依赖性，并证明了在给定平均速度下扩展裂纹的能量不仅取决于模量，还取决于样品厚度。
