Zig-zag crack propagation in MgAl2O4 crystals

Zig-zag crack propagation in MgAl2O4 crystals

The zig-zag crack propagation associated with environmental effects observed in MgAl2O4 single crystals appears to have relevance to crack propagation in polycrystalline materials. The close parallel between intergranular (ie., microscopically rougher), rather than transgranular (ie., microscopicall...

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Veröffentlicht in:Journal of materials science letters 1995, Vol.14 (7), p.474-477
Hauptverfasser: WU, C. C. M, MCKINNEY, K. R, RICE, R. W
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Sprache:eng
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Condensed matter: structure, mechanical and thermal properties
Exact sciences and technology
Fatigue, brittleness, fracture, and cracks
Mechanical and acoustical properties of condensed matter
Mechanical properties of solids
Physics
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container_end_page 477
container_issue 7
container_start_page 474
container_title Journal of materials science letters
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creator WU, C. C. M
MCKINNEY, K. R
RICE, R. W
description The zig-zag crack propagation associated with environmental effects observed in MgAl2O4 single crystals appears to have relevance to crack propagation in polycrystalline materials. The close parallel between intergranular (ie., microscopically rougher), rather than transgranular (ie., microscopically flatter), fracture and the zig-zag (rougher than normal) fracture as crack velocity increases indicates that such intergranular-transgranular changes could be a function of crack velocity. The observation that zig-zag crack propagation diminishes with increasing crack velocity also suggests that crack bridging in polycrystals, which requires similar zig-zag cracking, may also diminish with increasing crack velocity. 14 refs.
doi_str_mv 10.1007/BF00665906
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subjects Condensed matter: structure, mechanical and thermal properties
Exact sciences and technology
Fatigue, brittleness, fracture, and cracks
Mechanical and acoustical properties of condensed matter
Mechanical properties of solids
Physics
title Zig-zag crack propagation in MgAl2O4 crystals
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