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۱Fracture Mechanisms During Crack Branching. Part 2. Steel
اطلاعات انتشار: World Applied Sciences Journal، بيست و چهارم،شماره۴، ۲۰۱۳، سال
تعداد صفحات: ۸
The mechanism and patterns of rapid crack propagation and branching in carbon steel were studied on the fracture of cylindrical vessels with artificial defects under internal pressure. It was established that microscopic fracture patterns are common for model (polymethylmethacrylate) and structural (carbon steel) materials. SEM fractography shows that fracture occurs via transgranular cleavage; the lateral dimension of the crack formation zone increases along the crack path and decreases immediately before branching. A physical crack branching mechanism was proposed, based on study of patterns of single crack rapid propagation and its transition to branching mode in the model and structural materials. Crack transition from rectilinear propagation to branching occurs when its velocity V reaches its limiting value V*, at which the flow of elastic strain energy entering the crack tip, G, exceeds energy G* expended by the material to hold off the growth of the single crack, i.e. at G>G* (necessary condition) and V=V* (sufficient condition). The value of G* depends on the deformation properties of the material at V V* and on the sample thickness.
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