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Dynamic fragmentation of brittle solids: a multi-scale model

✍ Scribed by Christophe Denoual; François Hild

Publisher
Elsevier Science
Year
2002
Tongue
English
Weight
523 KB
Volume
21
Category
Article
ISSN
0997-7538

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✦ Synopsis

Modeling dynamic fragmentation of brittle materials usually implies to choose between a discrete description of the number of fragments and a continuum approach with damage variables. A damage model that can be used in the whole range of loadings (from quasi-static to dynamic ones) is developed. The deterministic or probabilistic nature of fragmentation is discussed. Qualitative and quantitative validations are given by using a real-time visualization configuration for analyzing the degradation kinetics during impact and a moiré technique to measure the strains in a ceramic tile during impact. Finally, a closed-form solution of the change of the number of broken defects with the applied stress gives a way of optimizing the microstructure of ceramics for armor applications.

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