Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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Internal Stress/Strain Analysis during Fatigue Crack Growth Retardation Using Neutron Diffraction

피로 균열 성장 지연에 대한 중성자 회절 응력 분석

  • Seo, Sukho (Department of Materials Science and Engineering, Chungnam National University) ;
  • Huang, E-Wen (Department of Materials Science and Engineering, National Chiao Tung University) ;
  • Woo, Wanchuck (Neutron Science Division, Korea Atomic Energy Research Institute) ;
  • Lee, Soo Yeol (Department of Materials Science and Engineering, Chungnam National University)
  • Received : 2018.04.30
  • Accepted : 2018.06.10
  • Published : 2018.07.27
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Abstract

Fatigue crack growth retardation of 304 L stainless steel is studied using a neutron diffraction method. Three orthogonal strain components(crack growth, crack opening, and through-thickness direction) are measured in the vicinity of the crack tip along the crack propagation direction. The residual strain profiles (1) at the mid-thickness and (2) at the 1.5 mm away from the mid-thickness of the compact tension(CT) specimen are compared. Residual lattice strains at the 1.5 mm location are slightly higher than at the mid-thickness. The CT specimen is deformed in situ under applied loads, thereby providing evolution of the internal stress fields around the crack tip. A tensile overload results in an increased magnitude of the compressive residual stress field. In the crack growth retardation, it is found that the stresses are dispersed in the crack-wake region, where the highest compressive residual stresses are measured. Our neutron diffraction mapping results reveal that the dominant mechanism is by interrupting the transfer of stress concentration at the crack tip.

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References

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