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FRACTURE PROCESS OF A FINITE BLOCK UNDER SYMMETRIC DYNAMIC LOADINGS
Author(s): 
Pages: 273-278
Year: Issue:  3
Journal: Explosion and Shock Waves

Keyword:  dynamic fracture of rockcontact explosionstress wave.;
Abstract: Tests showed that a brittle block subjected to two point explosion loadings at two symmetric surfaces could fracture along a plane passing through the line connecting the two loading points. This paper discusses the computational model based on the elastic dynamical theory as well as the dynamic photoelastic experiment and concrete model tests, which could be used to explain this phenomenon and the possibility of breaking rock boulders by this method. The results from this study indicat that in the described loading conditions, the stress waves, especially the tensile stress wave reflected from the free face, play an important role in breaking the block. Because of existence of multi - dimensional tensile stress concentration, radial cracks tend to appear at the edges of the loading surface. Then, under the influence of reflected wave from the lateral free face, these cracks would extend and join in the center of the block, then finally split the block. The symmetric loading could cause superposition of stress waves and make the block easily fully fractured.
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