Fatigue Crack Growth Properties of Friction Stir Welded Dissimilar Aluminum Alloys

이종알루미늄합금 FSW 접합부의 피로균열진전 특성

Lee, Won-Jun;Lee, Hyo-Jae;Kim, Hyung-Jin;Park, Won-Jo

  • Received : 2012.09.20
  • Accepted : 2013.02.14
  • Published : 2013.02.28


The presence of a crack can increase the local stress or strain, which can cause inelastic deformation and significantly reduce the life of a component or structure. Therefore, in this study, the fatigue crack growth (FCG) behaviors of friction stir welded Al 2024-T3 and Al 7075-T6 specimens were examined, with fatigue cracks growing parallel to the dynamically recrystallized zone at variable ${\Delta}K$ values and an R ratio of 0.3. In addition, the FCG values of the base metal Al 2024-T3 and Al 7075-T6 were tested under the same conditions and parameters as comparative groups. The results showed that compared with the base metal Al 2024 specimen, which had the best fatigue property, the welded specimen had only 88% of the fatigue cycles.


Friction stir welding;Aluminum alloy;Fatigue crack growth;Fracture surface


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Supported by : 한국산업기술재단, 경상대학교