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徐成源 서울産業大學校 1982 논문집 Vol.17 No.1
Formerly the design methods for considering only static loads were often used in bolt jointings. Nowadays in America, the simple and experimental methods have been developed in designing the bolt jointings subjected to dynamic loads as well as static loads. If the design methods for considering only static loads are replaced with those for considering both static loads and dynamic loads it comes out that the diameters of formerly designed bolts must be changed.
서성원,이승호 서울産業大學校 2000 논문집 Vol.51 No.2
The high-strength aluminum alloy, 7075-T651, was used to observe the fatigue-crack-propagation behavior for the various stress ratio wish constant amplitude loading and thus to predict the fatigue life. The crack length of through crack of weldments was 2.4mm and the remaining part was a base material. The experiment was accomplished by marking the crack propagate near the base material. The ratio of effective stress intensity factor range(U) was greatly increased at the interface of weld material and base material, with the maximum at R=0.3 and 0.5. The crack growth rate (da/dN) showed an increase at the interface.