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Home  >  Journal list  >  Journal of the Society of Materials Science, Japan  >  Vol.57  No.12 (2008)  >  pp.1224-1231

Journal of the Society of Materials Science, Japan
<<Previous article Vol.57  No.12 (2008)   pp.1224 - 1231 Next article>>

On a Shear Failure by the Maximum Frictional Shear Stress Criteria Using an Asymptotic Solution for the Drucker-Prager Elastic-Plastic Material

Chikayoshi YATOMI1) and Taiki SHIMBO2)
1) Graduate School of Natural Sci. & Tech., Kanazawa Univ.
2) Division of Environmental Sci. & Eng., Graduate School of Natural Sci. & Tech., Kanazawa Univ.


A new fracture criterion of the shear failure for the geomaterials is presented which enables to predict a straight extension of a crack in the elastic plastic materials under the compressive loads. It is an application of the Coulomb fracture criterion to a crack extension criterion called “The maximum frictional shear stress criterion”.
We examine the criterion by using both the singular and the constant terms in the asymptotic expansion of the crack tip stress fields for a linear hardening Drucker-Prager elastic plastic material. As a result, we find that the confining pressure, the frictional coefficient of the crack surface, the small hardening parameter, and the dilatancy effect is the lowering of the extensive hoop stress causing the crack kink, which contribute the frictional shear stress extending a crack straight to maximum.


Keyword:
Shear failure, Maximum frictional shear stress criteria, Asymptotic analysis, Drucker-Prager elastic-plastic material Mode II, Compressive loading

Received: April 21, 2008
Published online: December 19, 2008
Copyright (c) 2008 by The Society of Materials Science, Japan

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