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Analysis on the Fatigue Fracture Surface of Gas Piping Material using the X-Ray Fractography  

Lim, Man-Bae (Korea Atomic Energy Research Institute)
Publication Information
Journal of the Korean Society of Safety / v.17, no.1, 2002 , pp. 18-24 More about this Journal
Abstract
This study verified the relationship between fracture mechanics parameters(${\Delta}K,\;K_{max}$) and X-ray parameters ($(\sigma}_r,;B$) for G365 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 in low ${\Delta}K$ region, reach to a maximum value at a certain value of $K_{max}$ or ${\Delta}K$ and then decrease. Residual stress was independent on stress ratio by arrangement of ${\Delta}K$ and half value breadth was independent by the arrangement of $K_{max}$. The equation of ${\sigma}_r-{\Delta}K$ was established by the experimental data. Therefore, fracture mechanics parameters could be estimated by the measurement of X-ray parameters.
Keywords
X-ray diffraction; fatigue crack propagation rate; residual stress; half-value breadth; stress intensity factor; fatigue fractured surface;
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