1. Rosetta Stone Experiments.
- Author
-
D. Shockey
- Subjects
FRACTURE mechanics ,DEFORMATIONS (Mechanics) ,STRENGTH of materials ,STRAINS & stresses (Mechanics) ,DYNAMICS ,MECHANICS (Physics) - Abstract
Abstract  Dynamic failure events such as armor penetration and explosive fragmentation are too complex to be treated by classical single-crack continuum fracture mechanics. In such cases deformation and fracture result from multiple cracks, voids, and shear bands acting simultaneously and influencing one anotherâs evolution. An alternative âmesoâ fracture mechanics is needed that treats microfailure activity while permitting fast and inexpensive predictive computations. This paper discusses the approach and experiments that elucidate and quantify failure physics on the micron level. âRosetta Stoneâ experiments that isolate a damage mode, produce statistical distributions of damage features, and âfreeze inâ damage at various stages of development are described and illustrated. The observations and data lead to equations describing nucleation and growth of cracks, voids, and shear bands. The resulting mesomechanical material failure models link the microworld with the macroworld and can be used in continuum hydrocodes for fast, efficient simulations of dynamic fracture scenarios. [ABSTRACT FROM AUTHOR]
- Published
- 2007
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