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RISS 인기검색어
- 검색키워드
- 저자 : 송득중(Duk-Joong Song) (검색결과 2 건)
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TMCP강의 용접이방성 및 과대하중이 피로균열진전에 미치는 영향
송득중(Duk-Joong Song),이기백(Ki-Baik Lee) 산업기술교육훈련학회 2010 산업기술연구논문지 (JITR) Vol.15 No.2
Recently the most of marine structures was bing composed by the welding on distinguished development of welding technology. However, a lot of welding zone fatigue crack accident was reported annually. This accidents coursed by attack in large high waves, or a storm etc. Actually, acted loading power on marine structures was not regular waved loadings but the irregular waved loadings. These irregular wave loadings is much effected on the fatigue life. In this point, the important thing is investigating the effect on fatigue crack propagation of overloading by simplify the irregular loadings. The studies of these overloading effects on welded structures will be much helpful to prevent the fatigue crack accidents or the marine structure s life. Therefore, on this studies, We used welding heat effected sample pieces that s a pressed steel material by newly developed Thermo Mechanical Control Process(TMCP) method for the marine structures. And we investigate the effect of fatigue crack propagation and crack open/closing behavior on welding heat effects by this sample pieces, and also we investigate the most important overloading effects of the irregular wave loadings on that fatigue crack propagation and crack open/closing behavior. We investigated that the fatigue crack propagation was located on the low side than the main body. And didn t found the weld anisotropy effect, but on the case of welded substance, the fatigue crack propagation velocity on the overload was more delate on the breadth direction than pressed direction, therefore we can consider the delate phenomena of crack propagation was not accomplished due to the crack open/close phenomena.
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TMCP강의 부식 환경하에서의 과대하중이 피로균열진전에 미치는 영향
이기백(Ki-Baik Lee),송득중(Duk-Joong Song) 산업기술교육훈련학회 2012 산업기술연구논문지 (JITR) Vol.17 No.1
The load working on real marine structures by an accident great wave or a ocean storm is not a load contains regular wavelength but a variable load with variable wavelength and power. Simplifying the variable load and investigation about the overload effect on the fatigue crack propagation behavior become more important subject. Corrosion fatigue phenomena as the source of damages will become a source of fatigue crack on the material surface. An explanation of fatigue crack propagation behavior on the variable load will be very important on estimate the lifetime or estimate the remained lifetime of the using real machine on the design. Simplifying the variable load and investigation about the overload effect to fatigue crack propagation behavior become most important subject. So, We investigate the TMCP(Thermo-Mechanical Control Process) steel s crack propagation velocity delay and acceleration effects according to the overload loading under artificial seawater environment. And we conclude belows. 1. The delay ration tendency about the magnitude of ΔK on the air was different from that on the seawater. 2. The crack propagation velocity differences of the overall delay time zone on the air relate the magnitude of the delay ratio. And the lower crack propagation velocity makes the great delay ratio in the overall delay time zone on working the corrosion. 3. The more overload repeating times make the great delay ratio on the air and the seawater, especially the 100 times makes much great delay ratio than a time or the 10 times.
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