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Date of Publication:2017-01-01

Journal:大连理工大学学报

Volume:57

Issue:5

Page Number:494-500

ISSN No.:1000-8608

Abstract:The effective simulation of the fracture process zone (FPZ)of quasi-brittle material (concrete)by using nonlinear fracture mechanics model is one of the hot spots in the current research. Extended scaled boundary finite element method (X-SBFEM)has advantages of both extended finite element method (XFEM)and scaled boundary finite element method (SBFEM),making full use of XFEM to describe discontinuous displacement field in non-crack-tip area and SBFEM to precisely solve stress singular problems in the crack-tip area.For the application of nonlinear fracture models in X-SBFEM,based on the model of the cohesive traction,the FPZ of the quasi-brittle material (concrete) is simulated using the iterative method of linear superposition by the form of side-face traction. Finally,numerical examples of the three-point single notched bending beam and the four-point single notched shear beam are used to simulate the energy dissipation effect in the FPZ,which verify the accuracy and application effect of the proposed method.

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