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SS41村 熔接部의 疲勞龜裂傳播에 미치는 殘留應力의 影響
李龍福,金鍾鉉,趙顯億 弘益大學校 1988 弘大論叢 Vol.20 No.2
In this study submerged arc welded the welding structural steel(SS41) was selected as an application model. On condition that stress ratios were 0.5, 0.3, 0.05, the relaxation of the residual stress was measured according to the number of repeated cycles, and the experimental values were compared with the values expected by the superposition of residual stress relaxation. The result are summarized as follows : 1. Welding residual stress is conspicuously reduced depend on the increase of repeated cycles, that is, the effect of welding residual stress on the crack propagation is gradually reduced with the increase of repeated cycles. 2. The error bet ween the experimental values and expected values which are considered only initial residual stress can be reduced by consideration of residual stress relaxation according to repeated cycles. The expected values depend on this method agree to experimental results of fatigue fracture behavior. 3. In case of welded metal, unlike base metal, rate of initial crack ropagation don't show up large difference because the difference of effective stress ratio(Reff) is decreased very much by addition to tensile residual stress.
백영지 ( Young-ji Baek ),신혜지,송호연,조현억,이병권 한국정보처리학회 2019 한국정보처리학회 학술대회논문집 Vol.26 No.1
대기질 악화로 인해 실내운동에 대한 중요성이 증가하고 있다. 하지만 실내에서 사용가능한 가상체험 장비는 비싼 가격으로 일반 가정에서 쉽게 접할 수 없는 현실이다. 본 연구에서는 저비용으로 활용가능한 로잉머신과 개인 스마트폰을 이용한 실내 운동 솔루션을 제안한다.