Abstract
Fatigue behaviors of load-carrying cruciform joints considering geometry variations and strength heterogeneity between base metal and weldments were studied. Low and high cycle fatigue tests were performed on specimens under displacement controlled and force controlled conditions. Observation of the specimens revealed that crack propagation paths differ by different loading conditions and that failure life was dominated by crack propagation. Besides, it was found that the effect of the strength under matching on the fatigue strength becomes large in low cycle fatigue region by significantly reducing fatigue life of the specimen. The test data were also assessed by nominal strain and proposed design guidance based on effective notch strain.
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