Journal of Ocean Engineering and Technology (한국해양공학회지)

Korean Society of Ocean Engineers (한국해양공학회)
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Behavior of Fatigue Crack Initiation and Growth in SM45C Steel under Biaxial Loading

이축하중을 받는 SM45C강의 피로균열의 발생과 성장거동

  • KIM SANG-TAE (School of Mechanical Engineering, Yeungnam University) ;
  • PARK SUN-HONG (School of Mechanical Engineering, Yeungnam University) ;
  • KWUN SOOK-IN (School of Materials Engineering, Korea University)
  • Published : 2004.12.01
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Abstract

Fatigue tests were conducted on SM45C steel using hour-glass shaped smooth tubular specimen under biaxial loading in order to investigate the crack formation and growth at room temperature. Three types of loading systems, were employed fully-reserved cyclic torsion without a superimposed static tension or compression fully-reserved cyclic torsion with a superimposed static tension and fully-reserved cyclic torsion with a superimposed static compression. The test results showed that a superimposed static tensile mean stress reduced fatigue life however a superimposed static compressive mean stress increased fatigue life. Experimental results indicated that cracks were initiated on planes of maximum shear strain whether or not the mean stresses were superimposed. A biaxial mean stress had an effect on the direction that the cracks nucleated and propagated at stage 1 (mode II).

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References

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