title: Force-induced breakdown of flexible polymerized membrane.
abstract: We consider the fracture of a free-standing two-dimensional (2D) elastic-brittle network to be used as protective coating subject to constant tensile stress applied on its rim. Using a molecular-dynamics simulation with a Langevin thermostat, we investigate the scission and recombination of bonds, and the formation of cracks in the 2D graphenelike hexagonal sheet for different pulling force f and temperature T. We find that bond rupture occurs almost always at the sheet periphery, and the first mean breakage time <τ> of bonds decays with membrane size as <τ> ∝N(-β), where β≈0.50±0.03 and N denotes the number of atoms in the membrane. The probability distribution of bond scission times t is given by a Poisson function W(t)∝t(1/3)exp(-t/<τ>). The mean failure time <τ(r)> necessary to rip off the sheet declines with growing size N as a power law <τ(r)>∝N(-φ(f)). We also find <τ(r)>∝exp(ΔU(0)/k(B)T), where the nucleation barrier for crack formation ΔU(0)∝f(-2), in agreement with Griffith's theory. <τ(r)> displays an Arrhenian dependence of <τ(r)> on temperature T. Our results indicate a rapid increase in crack spreading velocity with growing external tension f.
authors.affiliation: Max Planck Institute for Polymer Research, 10 Ackermannweg, D-55128 Mainz, Germany.
authors.forename: J
authors.initials: J
authors.lastname: Paturej
authors.forename: H
authors.initials: H
authors.lastname: Popova
authors.forename: A
authors.initials: A
authors.lastname: Milchev
authors.forename: T A
authors.initials: TA
authors.lastname: Vilgis
mesh_terms: D003198:Computer Simulation; D055119:Elastic Modulus; D008567:Membranes, Artificial; D008956:Models, Chemical; D008958:Models, Molecular; D015233:Models, Statistical; D011108:Polymers / Q000737:chemistry*; D013314:Stress, Mechanical
chemical_list: D008567:Membranes, Artificial; D011108:Polymers