Slip lines at the end of a cut at the interface of different media

On the direction of development of a thin fracture process zone at the tip of an interfacial crack between dissimilar media

“…In recent years, there has been intensive development of studues in the field of the fracture mechanics of various deformable bodies, including composite materials, welded and adhesive joints, fractured rocks, and concrete and polymers. That was owing to new models of fracture mesomechanics that account, more fully than in the classical models, for the features of fracture process zones at crack tips [2][3][4][10][11][12][13][14][15].Most theoretical studies in the field of the mechanics of interfacial cracks supposed that the fracture process zone is a surface on which the normal or tangential displacements discontinue. This surface is located on the continuation of the crack and does not go beyond the crack plane [2,4,11,12,15].…”

“…In recent years, there has been intensive development of studues in the field of the fracture mechanics of various deformable bodies, including composite materials, welded and adhesive joints, fractured rocks, and concrete and polymers. That was owing to new models of fracture mesomechanics that account, more fully than in the classical models, for the features of fracture process zones at crack tips [2][3][4][10][11][12][13][14][15].…”

“…A similar formulation was earlier used in [3,4] to analyze initial fracture process zones modeled by various displacement discontinuity lines located in the interface between media. An analysis of the associated solutions reveals that after a discontinuity line is introduced, the stresses cease to oscillate at the crack tip, and the singularity becomes a power-law one.…”

Initial kinking of an interface crack between two elastic media

“…Thus, eliminating one physical incorrectness with the help of the contact model, researchers in some cases arrive at another paradoxical result which raises doubts about this model. In [30], it is recommended to apply this model to pure shear only.The second approach is based on the Barenblatt and Leonov-Panasyuk-Dugdale models and their modifications and various models describing cohesive zones in polymers [2,17,19,21], ceramics [11], concrete [29], composites [2, 11, 19-22, 27, 28].When this approach is applied to cracks at the interface between dissimilar media in [3,4,11,14,17,31], the crack faces do not overlap and the fracture process zone under tensile forces is not extremely small, unlike the contact model.In studying the behavior of cracks at the interface between dissimilar materials (polymer-metal, polymer-composite) in [36], it was experimentally established that if the crack growth rate is low, the crack propagates in the interface. As the crack growth rate increases, the crack leaves the interface to enter the softer (polymeric) material.…”

“…To avoid it, new approaches were developed in [3,4,12,13,15]. One approach is based on the studies [12,13,15], where the oscillations of the stresses and displacements are eliminated by introducing contact zones at crack tips.…”