Abstract
Two energy characteristics of interfacial bridged cracks are considered: 1) the deformation energy release rate associated with the crack tip stress intensity factors; 2) the rate of the energy absorbtion by bonds associated with the energy necessary to create a unit of new surface of the bridged zone. The analysis of these energy characteristics (the last one - with more details) for interfacial straight bridged crack is performed numerically. The influence of materials and bonds mechanical properties on the energy characteristics of the bridged crack is studied. The limit equilibrium analysis of a crack is performed on the basis of the proposed nonlocal two-parametrical fracture criterion with the crack tip development condition which is based on the crack bridged zone energy characteristics (it is the necessary fracture condition) and the kinematic condition for the advancing of the trailing edge of the crack bridged zone (it is the sufficient fracture condition). The regimes of the equilibrium and quasi-static growth of the bridged zone and the crack tip are formulated.
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