WIT Press

Instabilised Crack Growths

Price

Free (open access)

Paper DOI

10.2495/BE010021

Pages

10

Size

856 kb

Author(s)

P. Brož

Abstract

Instabilized crack growth P. Broz* ^ Department of Engineering Structures, Klokner Institute of the Czech Technical University Prague, Czech Republic Abstract In order to model the fracture behaviour of structures of concrete-like materials, the cohesive-crack simulation is introduced. A direct boundary element method is used and indicated to be efficient, given the circumstances that are described by non-linearity on interfaces only. Procedures for the direction quest and interface adaptation in growth study and for the stipulation of the resistance to a process zone-tip advance are worked out and tested. Softening as an instabilizing consideration included in the cohesive-crack model can bring about trajectory bifurcations (equilibrium branching), and instabilities both the internal (snapback) one and when controlled load. An account of the numerical method to perform fast computation for cohesive- crack propagation in mode I is also shown. 1 Introduction A full

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