Living Matter Department, AMOLF, Science Park 104, 1098 XG Amsterdam, Netherlands.
Designer Matter Department, AMOLF, Science Park 104, 1098 XG Amsterdam, Netherlands.
Phys Rev Lett. 2018 Jun 29;120(26):268002. doi: 10.1103/PhysRevLett.120.268002.
In viscoelastic materials, individually short-lived bonds collectively result in a mechanical resistance which is long lived but finite as, ultimately, cracks appear. Here, we provide a microscopic mechanism by which a critical crack length emerges from the nonlinear local bond dynamics. Because of this emerging length scale, macroscopic viscoelastic materials fracture in a fundamentally different manner from microscopically small systems considered in previous models. We provide and numerically verify analytical equations for the dependence of the critical crack length on the bond kinetics and applied stress.
在黏弹性材料中，个体的短寿命键合共同导致了一种机械阻力，这种阻力的寿命很长但有限，因为最终会出现裂缝。在这里，我们提供了一种微观机制，通过这种机制，临界裂纹长度从非线性局部键合动力学中出现。由于这个出现的长度尺度，宏观黏弹性材料的断裂方式与之前模型中考虑的微观小系统有根本的不同。我们提供并数值验证了关于临界裂纹长度与键合动力学和施加应力的依赖关系的解析方程。
