Mechanical modeling of Lateral Cracking in Brittle Materials under Indentation

DOI

10.2991/mems.2012.53How to use a DOI?

Keywords

indentation; the lateral crack; the cavity expansion model; the sterss intensify factors; the energy release rate

Abstract

Experiments have indicated that when brittle materials are under indentation, various forms of cracks including median crack, ring crack, Hertzian crack and side (lateral) crack nucleate leading to the fragmentation. The lateral cracking under indentation can be attributed to unloading and plays a crucial role in formation of chips. Based on the mechanism of the lateral cracking, we have investigated a penny shaped crack parallel to surface under indentation with unloading. The stress intensity factors (SIFs) and the energy release rate haven been calculated. It has been found that there exists a crack size at which both SIF and the energy release rate attains maximum values. Relationship between the indentation force and that crack size has been obtained numerically. The influences of the dilatancy angle and unloading have been also demonstrated

Copyright

© 2012, the Authors. Published by Atlantis Press.

Open Access

This is an open access article distributed under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/).

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TY  - CONF
AU  - Liu Ji-Peng
AU  - Huang Gan-Yun
PY  - 2012/12
DA  - 2012/12
TI  - Mechanical modeling of Lateral Cracking in Brittle Materials under Indentation
BT  - Proceedings of the 1st International Conference on Mechanical Engineering and Material Science (MEMS 2012)
PB  - Atlantis Press
SP  - 195
EP  - 198
SN  - 1951-6851
UR  - https://doi.org/10.2991/mems.2012.53
DO  - 10.2991/mems.2012.53
ID  - Ji-Peng2012/12
ER  -