Numerical and experimental research on the fracture and propagation of the branch crack under compression
The cracks in the material are in varied formssuch as bendcross and branch.The numerical and experimental methods were applied to study the fracture problem of the branch crack under compressionconsidered the influence of different branch crack inclination and length to the stress intensity
factors and the wing crack propagation.The results show that the increase of the crack inclination stress intensity factor K I decreasesand the stress intensity factors increase with the crack length increasesthe branch crack with a large length may inhibit the smaller one.The sandstone specimens
containing open branch cracks or kink cracks subjected by uniaxial compressive loads were used to analysis the wing crack propagationthe experimental results find that the forms of the destruction of the sandstone specimen are mainly type I wing cracksand its distance from the crack tip decreases
with the increase of branch crack inclinationthe bigger branch crack inclinationthe smaller wing crack initial angle but the bigger wing crack initial load.The comparison was also made between open and closed crackswing crack initial angle of the open crack is greater than the closed one’sbut
its wing crack initial load is just the opposite.
Keywords: branch crack; initial angle; initial load; open crack; stress intensity factor; wing crack
Document Type: Research Article
Publication date: 15 July 2013
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