Lattice-Modeling Of Oscillating Fracture Paths In Hperelasticity Material

There has been a long history in the study of fracture in materials, but a lot of problems still remain open. Up to now, the field of dynamic fracture have devoted particular attention to the crack tip instability such as branching and oscillation and made a great progress. However, it is difficulty to predict the fracture paths by theory or simulation.Recently, there has been renewed interest in the subject of dynamic fracture as it is motivated in large part by new sets of experiments and these experiments have called into question some of the predictions of the traditional, continuum mechanics approach to fracture dynamics.When a balloon is pricked, being careful, a wavy pattern--a row of shark's teeth of cracks on the edges of the fragments could be found. This is formed by the cracks oscillating about the centerline in the direction of crack propagation.A piece of rubber sheet, applied strain on the order of 200% in the both x and y directions, and always chosen so that the strain in the y direction, ε_y, is greater than the strain in the x direction, ε_x, is punctured with a pin, the crack tip that forms is sharp and wedge-shaped, and it's surprising that the crack may oscillate. Four years ago, the interesting phenomenon was firstly studied in thin rubber sheets experimentally by Deegan, et al, and it is not yet explained either in theory or...