1. ON FAILURE IN POLYCRYSTALLINE AND AMORPHOUS BRITTLE MATERIALS.
- Author
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Bourne, N. K.
- Subjects
- *
DEFORMATIONS (Mechanics) , *CERAMICS , *BALLISTICS , *TILES , *MATERIAL plasticity - Abstract
The performance of behaviour of brittle materials depends upon discrete deformation mechanisms operating during the loading process. The critical mechanisms determining the behaviour of armour ceramics have not been isolated using traditional ballistics. It has recently become possible to measure strength histories in materials under shock. The data gained for the failed strength of the armour are shown to relate directly to the penetration measured into tiles. Further the material can be loaded and recovered for post-mortem examination. Failure is by micro-fracture that is a function of the defects and then cracking activated by plasticity mechanisms within the grains and failure at grain boundaries in the amorphous intergranular phase. Thus it is the shock-induced plastic yielding of grains at the impact face that determines the later time penetration through the tile. [ABSTRACT FROM AUTHOR]
- Published
- 2009
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