Abstract
The micro-mechanism of fracture in brittle material of PMMA is analysed by focusing the parabolic patterns formation process which can be observed on fractured surfaces at some crack velocity region. The initiation and extension of secondary cracks are studied by the use of a model proposed for the mechanism. The foci of parabolas which are the nuclei of the secondary cracks are examined in detail. The positions of foci from the main crack front are measured to obtain the average initiation stress. The size of the nucleus, which is defined as a smooth central part, is considered as the critical size for the unstable crack growth, from which the surface formation energy in the microscopic aspect is deduced. The parabolic patterns obtained in the simulation are in good coincidense with the observed patterns including the velocity effect on the configuration of patterns.
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