Transactions of the Korean Society of Mechanical Engineers A (대한기계학회논문집A)

The Korean Society of Mechanical Engineers (대한기계학회)
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A Study on Prediction of Stress Intensity Factor and Fatigue Crack Growth Behavior Using the X-ray Diffraction Technique

X-선 회절을 이용한 피로균열진전거동과 응력확대계수 예측에 관한 연구

  • 임만배 (한국원자력연구소) ;
  • 부명환 (한국원자력연구소) ;
  • 공유식 (동의대학교 기계산업시스템공학부) ;
  • 윤한기 (동의대학교 기계산업시스템공학부)
  • Published : 2003.05.01
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Abstract

This study verified the relationship between fracture mechanics parameters(ΔK, ΔK$\sub$eff/, K$\sub$max/) and X-ray parameters (${\alpha}$$\sub$r/, B) for SG365 steel at elevated temperature up to 300$^{\circ}C$. The fatigue crack propagation test were carried out and X-ray diffraction technique according to crack length direction was applied to fatigue fractured surface. The residual stress on the fracture surface was found to increase low ΔK region, reach to a maximum value at a certain value of K$\sub$max/ or ΔK and then decrease. Residual stress were independent on stress ratio by arrangement of ΔK and half value breadth were independent by the arrangement of K$\sub$max/. The equation of ${\alpha}$$\sub$r/ - ΔK was established by the experimental data. Therefore, tincture mechanics parameters could be estimated by the measurement of X-ray parameters.

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References

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