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Dynamic viscoplastic approach for strain localization in a sandstone

Published online by Cambridge University Press:  15 April 2000

N. G. Diouta
N. G. Diouta*
Affiliation:
GRMS, ENSET, B.P. 1872, Douala, Cameroun
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Abstract

In this paper, the viscoplastic regularization method is used to simulate strain localization in a compressed prismatical sample of Fontainebleau sandstone. First of all, the limits of Rice's formalism concerning the prediction of the localization band width and the post-bifurcation treatment are recalled. Then the theoretical aspects of the viscoplastic regularization method is reviewed. The non-objectivity or mesh-sensitivity of the solution is pointed out when a simple plastic model without viscosity is used. Finally, a fictitious viscosity parameter in the form of relaxation time is introduced in the model and regularizes the problem.

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Type
Research Article
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The European Physical Journal - Applied Physics , Volume 10 , Issue 1 , April 2000 , pp. 53 - 65
Copyright
© EDP Sciences, 2000

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