Delayed fracture of an inhomogeneous soft solid
The spontaneous fracture of polymer gels was studied. Contrary to crystalline solids, where fracture usually happens instantaneously at a well-defined breaking strength, the fracture of a polymer gel can occur with a delay. When a constant force was applied, the cracks nucleated and started to propagate after a delay that can be as long as 15 minutes, depending on the force. This phenomenon can be understood by calculating the activation energy for crack nucleation in arbitrary dimension and accounting for the inhomogeneity of the gel network in terms of its fractal dimension.
Bonn
D
D. Bonn, M. Prochnow, K. Ben-Djemiaa, J. Meunier, Laboratoire de Physique Statistique de l'Ecole Normale Superieure, 24 rue Lhomond, 75231 Paris Cedex 05, France. H. Kellay, Centre de Physique Moleculaire Optique et Hertzienne, Universit
Kellay
H
Prochnow
M
Ben-Djemiaa
K
Meunier
J