Cohesive Crack Model for Geomaterials: Stability Analysis and Rate Effect

[+] Author and Article Information
Zdeněk P. Bažant, Yuan-Neng Li

Department of Civil Engineering and Materials Science, Northwestern University, Evanston IL 60208

Appl. Mech. Rev 47(6S), S91-S96 (Jun 01, 1994) doi:10.1115/1.3124448 History: Online April 29, 2009


The cohesive (or ficticious) crack model, characterized by softening stress-displacement relations, provides a good description of fracture of quasibrittle materials such as conrete, rock, or tough ceramics. The cohesive crack model is formulated in terms of compliance influence functions and the failure is analyzed as a stability problem. The size effect is determined by means of an eigenvalue problem. In this problem, the structure size for which a given relative crack length yields the maximum load is the eigenvalue. The model is further generalized to time dependence. The opening displacement is considered as a function of the cohesive stress and the opening rate of the crack. Finally, applications to rock and concrete are discussed.

Copyright © 1994 by American Society of Mechanical Engineers
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