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A semi-analytical solution method for problems of cohesive fracture and some of its applications

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Abstract

Cohesive zone models are extensively used for the failure load estimates for structure elements with cracks. This paper focuses on some features of the models associated with the failure load and size of the cohesive zone predictions. For simplicity, considered is a mode I crack in an infinite plane under symmetrical tensile stresses. A traction–separation law is prescribed in the crack process zone. It is assumed by the problem statement that the crack faces close smoothly. This requirement is satisfied numerically by a formulation of the modified boundary conditions. The critical state of a plate with a cohesive crack is analyzed using singular integral equations. A numerical procedure is proposed to solve the obtained systems of integral equations and inequalities. The presented solution is in agreement with other published results for some limiting cases. Thus, an effective methodology is devised to solve crack mechanics problems within the framework of a cohesive zone model. Using this methodology, some problems are solved to illustrate the (i) influence of shape parameters of traction–separation law on the failure load, (ii) ability to account for contact stress for contacting crack faces, (iii) influence of getting rid of stress finiteness condition in the problem statement.

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Correspondence to Y. O. Chornoivan.

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Selivanov, M.F., Chornoivan, Y.O. A semi-analytical solution method for problems of cohesive fracture and some of its applications. Int J Fract 212, 113–121 (2018). https://doi.org/10.1007/s10704-018-0295-6

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  • DOI: https://doi.org/10.1007/s10704-018-0295-6

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