Abstract
A method of testing elastic-plastic fracture toughness 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 of J=J1+JII, where JI and JII are the components of mode I and mode II deformation, respectively. JI and JII can be estimated from the M-θ diagram (M : bending moment, θ : crack opening angle) and F-U diagram (F: shearing force, U : crack shearing displacement). In order to obtain the M-θ diagram and F-U diagram, a new deformation gauge for a mixed-mode crack was developed by using optical-position-sensing devices. The elastic-plastic fracture toughness tests under mixed-mode loading were carried out on aluminum alloy 6061-T651. The crack initiation from a mixed-mode crack occurs in the 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 a mode-II-predominant loading, the shear-type crack initiation occurs in a ductile manner. The condition of crack initiation from the mixed-mode I-II crack is shown by two curves for the tensile type and shear type on the JI-JII plane.
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