Abstract
An elastic-plastic Fracture toughness test under mixed mode loading was proposed using a single-edge-cracked specimen subjected to bending moment and shearing force. The J-integral of a crack in the specimen is expressed in the form J = J I + J II , where J I and J II , are the components of mode I and mode II deformation, respectively. J I and J II can be estimated from M-θ ( M: bending moment; θ: crack opening angle) and F-U diagrams ( F: shearing force; U: crack shearing displacement). In order to obtain the M-θ and F-U diagrams, a new deformation gauge for a mixed mode crack was developed. The elastic-plastic Fracture toughness tests were carried out on aluminum alloy 6061-T651. The ductile crack initiation from the mixed mode crack occurs as tensile-type and shear-type depending on the loading mode. As the mode I component becomes more predominant, the tensile-type crack is initiated in a brittle manner. On the other hand, under mode II predominant loading, shear-type crack initiation occurs in a ductile manner. The condition of crack initiation from a mixed mode I–II crack is shown by two curves for the tensile-type and shear-type on the J I -J II plane.
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