Effects of material properties on the fragmentation of brittle materials

We present a fundamental investigation of the influence of material and structural parameters on the mechanics of fragmentation of brittle materials. First, we conduct a theoretical analysis (similar to Drugan's single wave problem, Drugan, WJ. (2001), Journal of Mechanical and Physics Solids 49, 1181-1208.) and obtain closed form solutions for a problem coupling stress wave propagation and single cohesive crack growth. Expressions for a characteristic fragment size s(0) and a characteristic strain-rate (epsilon) over dot(0) are given. Next, we use a numerical approach to analyze a realistic fragmentation process that involves multiple crack interactions. The average fragment size s is calculated for a wide variety of strain-rates (epsilon) over dot and a broad range of material parameters. Finally, we derive an empirical function that relates the normalized fragment size s/s(0) to the normalized strain-rate (epsilon) over dot/(epsilon) over dot(0) and that fits all of the numerical results with a single master curve.

Published in:
International Journal of Fracture, 139, 2, 169-196

 Record created 2007-11-14, last modified 2018-03-17

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