Ductile fracture characterization with an anisotropic continuum damage theory

Abstract The paper presents an investigation of characterizing ductile fracture of centre-cracked tension specimen made of thin aluminium alloy based on the theory of an anisotropic continuum damage. The characterization is achieved by predicting the crack initiation of the ductile specimen using the finite element analysis. The computed stress/strain distributions are also compared with those using a fracture mechanics approach. The comparison reveals the underestimation of the computed stresses, resulting an over-estimation of fracture load using the conventional fracture mechanics analysis. Centre-cracked tension specimens are manufactured along both the longitudinal and transverse rolling direction in order to examine the effect of the rolling induced material anisotropy on the fracture load. The test results indicate that there is approximately an 8.8% difference in the measured fracture loads due to the effect of the rolling process, although the difference is not considered significant. The average fracture load measured from a total of twelve test specimens is 276.3 MPa which is compared favourably with the computed fracture load of 260 MPa based on the proposed anisotropic damage model and of 290 MPa based on a conventional fracture mechanics approach.

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