Laboratoire Sciences et Ingénierie de la Matière Molle, PSL Research University, UPMC Univ Paris 06, ESPCI Paris, CNRS, 10 rue Vauquelin, 75231 Paris cedex 05, France.
Saint-Gobain, 39 Quai Lucien Lefranc, 93300 Aubervilliers, France.
Soft Matter. 2017 Feb 22;13(8):1624-1633. doi: 10.1039/c6sm02785g.
In the dynamic rupture of laminated glass, it is essential to maximize energy dissipation. To investigate the mechanisms of energy dissipation, we have experimentally studied the delamination and stretching of a polymeric viscoelastic interlayer sandwiched between glass plates. We find that there is a velocity and temperature domain in which delamination fronts propagate in a steady state manner. At lower velocities, fronts are unstable, while at higher velocities, the polymer ruptures. Studying the influence of the interlayer thickness, we have shown that the macroscopic work of fracture during the delamination of the interlayer can be divided in two main components: (1) a near crack work of fracture which is related to the interfacial rupture and to the polymer deformation in the crack vicinity. (2) A bulk stretching work, which relates to the stretching of the interlayer behind the delamination front. Digital image correlation measurements showed that the characteristic length scale over which this stretching occurs is of the order of the interlayer thickness. Finally, an estimate of the bulk stretching work was provided, based on a simple uniaxial tensile test.
在层压玻璃的动态断裂中，最大限度地耗散能量至关重要。为了研究能量耗散的机制，我们通过实验研究了夹在玻璃板之间的聚合物粘弹性夹层的分层和拉伸。我们发现存在一个速度和温度域，在该域中分层前沿以稳定的方式传播。在较低的速度下，前沿是不稳定的，而在较高的速度下，聚合物会破裂。研究夹层厚度的影响，我们表明，在夹层分层过程中，宏观断裂功可以分为两个主要组成部分：（1）与界面断裂和裂纹附近聚合物变形相关的近裂纹断裂功。（2）与分层前沿后面的夹层拉伸相关的大块拉伸功。数字图像相关测量表明，发生这种拉伸的特征长度尺度与夹层厚度相当。最后，基于简单的单向拉伸试验，提供了大块拉伸功的估计。
