軟鋼溶接継手の片振り引張りにおける疲労亀裂発生寿命推定について

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In this study, it was investigated to evaluate the fatigue crack initiation life 1\i~c at a three-dimensional notch such as a toe of weld, which is in plane strain state, on the basis of fatigue test results using a smooth round-bar specimen at completely reversed constant strain amplitude. Finite element elasto-plastic analyses in plane stress state and in plane strain state were performed on a cruciform joint welded in complete penetration on condition of pulsating tensile loading. The analyzed cyclic stress and strain in each stress state at the toe of weld were converted into the equivalent stress and strain in uniaxial stress state, using hysteresis loop of stress-strain relation and the conversion factors derived with the aid of total deformation plasticity theory. The converting stress and strain were applied to stress-strain function D, and then the crack initiation life at the toe of weid in plane stress state and in plane strain state could be evaluated from D-N_c diagram obtained by the completely reversed strain fatigue test using a smooth round-bar specimen. In order to confirm experimentally the present method of the fatigue life evaluation, moreover, fatigue tests were performed on two kinds of the cruciform joint specimens with short and long length along the weld bead, which corresponded to plane stress state and plane strain state respectively. A good agreement was found between the experimental life and that evaluated by the results of FEM in each stress state.
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軟鋼溶接継手の片振り引張りにおける疲労亀裂発生寿命推定について

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