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An Experimental Study on Fatigue Crack Growth Characteristics of Welded High-Strength Steels  

Hong, Sung Wook (한림정보산업대학 토목과)
Kyung, Kab Soo (한국해양대학교 토목환경공학부)
Nam, Wang Hyun (강원대학교 토목공학과)
Jung, Young Hwa (강원대학교 토목공학과)
Publication Information
Journal of Korean Society of Steel Construction / v.14, no.6, 2002 , pp. 773-782 More about this Journal
Abstract
In this study, a series of fatigue tests are performed in order to estimate quantitatively the characteristics of fatigue crack growth rate according to the base metal, heat affected zone(HAZ) and weld metal, and the welding method and grade of strength of object steels, and the influence on fatigue crack growth rate according to the direction of welded line for high strength steels of SM570, POSTEN60, and POSTEN80 steels. From the fatigue test results, the retardations of fatigue crack growth rate are remarkable in case that the direction of notch is parallel to welded line than in case that the direction of notch is perpendicular to welded line because of compresive residual stress in weld metal & HAZ. And the characteristics of fatigue crack growth rate according to welding method are that the dispersion of fatigue crack growth rate in case of FCAW method is smaller than that of SAW method. Also, it knows that the fatigue crack growth rate converges in high stress intensity factor range. Meanwhile, fatigue safety is guaranteed sufficiently in the object steels because the fatigue crack growth rate in the range of fatigue crack propagation has a similar tendency to the test results & existing results.
Keywords
High Strength Steel; Welding Heat Input; Compressive Residual Stress; Fatigue Crack Growth Rate; Stress Intensity Factor Range; Fatigue Safety;
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