발간논문

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Vol.38, No.3, 414 ~ 420, 2000
Title
Pesearch Paper / Mechanical Behavior : A Study on the Crack Growth Rate of High - Temperature Low - Cycle Fatigue in 1Cr-Mo-V Steel
정창열Chang Yeol Jeong,남수우Soo Woo Nam
Abstract
Smooth cylindrical specimens of 1Cr-Mo-V steel were tested under HTLCF( high-temperature low-cycle fatigue) conditions to investigate the growth behavior of microcracks. HTLCF crack growth rate is analyzed based on the concept of J-integral by monitoring the hysteresis loop. A new approach that the crack growth rate is measured by the striation counting from the observation of SEM(scanning electron microscope) fractographs was shown to be successful in determining the LCF crack growth rate as well as the LCF life. It is shown that ΔJ is reasonable in characterizing the growth rate of fatigue microcracks at elevated temperatures but results in unacceptable deviations for the hold time cycling owing to the relative contribution of time dependent processes at the crack tip. Approach of C(t) correlated with ΔJ gives recommendable results for interpreting the crack growth rate with hold time.
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