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Fracture mechanical behaviour of visco-elastic materials: application to the so-called dwell-effect

NAESER, Bastian
KALISKE, Michael
Dal, Hüsnü
NETZKER, Christiane
The material force approach is an efficient, elegant, and accepted means to compute the J-integral as a fracture mechanical parameter for elastic and inelastic materials. With the formulation of a multiplicative split of the deformation gradient at hand, rate-dependent (visco-elastic) materials described for example by the physically based Bergstrom-Boyce model can be investigated. For these investigations, the so-called material volume forces have to be computed in order to separate the driving forces acting on the visco-elastic zone around the crack tip from the driving forces acting on the crack tip itself, representing the crack driving force. To illustrate the effectiveness of this approach, the so-called dwell-effect of elastomeric materials is investigated. (C) 2009 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim