Damage And Dynamic Hardness Of Ionic Crystals By Microparticle Impact

M. M. Chaudhri; A. Stephens

doi:10.1117/12.957683

27 July 1979 Damage And Dynamic Hardness Of Ionic Crystals By Microparticle Impact

M. M. Chaudhri, A. Stephens

Proceedings Volume 0189, 13th Intl Congress on High Speed Photography and Photonics; (1979) https://doi.org/10.1117/12.957683
Event: 13th International Congress on High Speed Photography and Photonics, 1978, Tokyo, Japan

Abstract

A high-speed framing camera (framing rates up to 1.65 x 10⁶s^-1) has been used to follow the damage in NaC1 and LiF crystals by the impact of spheres of soda-lime glass and tungsten of diameter 0.1 - lmm and velocity up to 300 ms^-1. The damage takes place in two stages. During the loading, plastic flow occurs on {110} planes causing cracks on shear planes, and is followed by fast cleavage cracks on {100} planes containing the impact-axis. During the particle rebound the primary cleavage cracks stop propagating, but several cracks form on cleavage planes parallel to the impacted surface. The maximum strain rates in these experiments are ~105 s^-1; this leads to a considerable in-crease in the hardness of these solids.

Citation Download Citation

M. M. Chaudhri and A. Stephens "Damage And Dynamic Hardness Of Ionic Crystals By Microparticle Impact", Proc. SPIE 0189, 13th Intl Congress on High Speed Photography and Photonics, (27 July 1979); https://doi.org/10.1117/12.957683

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