Abstract
In this study, crack propagation tests and crack opening tests were conducted to clarify property for the fatigue crack propagation of friction stir welded (FSW) 2024-T3 aluminum alloy. Specimens had FSW of inclined angle of 0 and 45 degtees to direction of applied loading. Results showed that crack opening stress was decreased and crack propagation rate was accelerated by the tensile residual stress around the weld line. Irrespective to the weld line angle, crack opening stress and crack propagation rate were almost same. And the da/dN-△K_<eff> curve of FSW and base metal specimens showed good agreement with each other.
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