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고로슬래그 미분말을 다량 치환한 콘크리트의 온도의존성 분석
이주선 ( Lee Ju Sun ),이재삼 ( Lee Jae Sam ),류금성 ( Ryu Gum Sung ),한민철 ( Han Min Cheol ),이장화 ( Lee Jang Hwa ),한천구 ( Han Cheon Goo ) 한국구조물진단유지관리공학회 2008 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.12 No.1
This study analysis the fundamental properties of temperature-dependence corresponding the change of curing temperature classified by the replacement ratio of BS, and the results are summarized as following. As the properties of flow, plain satisfied with the target slump, and as the replacement ratio of BS increased, the flow increased, but the air content slightly decreased. The time of set delayed as the replacement ratio of BS increased, but the curing temperature 35℃, even with 80% BS replaced concrete, the time of set was faster than 5℃, 20℃ plain, so the temperature-dependence was much greater. The compressive strength was decreased as the replacement ratio of BS increased, especially as the curing temperature higher, the compressive strength was higher. Also as the age increased, the plain developed more strength, therefore it show the temperature-dependence is much larger.
레이저 피닝한 Ni 12% STS316L 피로특성의 신뢰성 향상
이금화(Gum-Hwa Lee),구경희(Kyoung-Hee Gu),남기우(Ki-Woo Nam) 대한기계학회 2022 大韓機械學會論文集A Vol.46 No.6
수소자동차는 환경문제 해결을 위하여 주목받고 있다. 그러나 수소 저장 탱크의 재료에 관한 안전성 및 신뢰성에 관한 연구가 거의 없다. 본 연구는 수소저장 탱크의 배관 재료 Ni 12% STS316L강의 안전성 및 신뢰성을 확보하기 위한 것이다. Non-LP 및 LP 평활시험편의 피로한도를 결정하고, LP한 균열형 상비(As) 0.1~1.0의 무해한 균열 깊이(a<SUB>hml</SUB>)를 평가하였다. 또한, a<SUB>hml</SUB>은 As, 피로한도를 감소시키는 균열 깊이(a<SUB>25</SUB>, a<SUB>50</SUB>) 및 NDI에서 검출가능한 균열 깊이(aNDI)와 비교하였다. 균열 무해화조건은 모두 균열최심점(A점)에서 결정되었다. a<SUB>hml</SUB>은 0.418~0.539 mm이고, 이 값은 긴 균열의 K<SUB>th(l)</SUB>로 평가 가능하였다. a<SUB>hml</SUB> 은 균열형상비(As)에 크게 의존하지 않았다. NDI 후에 검출한 균열을 보수 후 피닝하지 않는 경우, 균열검출 확율이 매우 높은 NDI1로 실시할 필요가 있다. Hydrogen vehicles are attracting attention to solve environmental problems. However, few studies exist on the safety and reliability of materials for hydrogen storage tanks. This study aims to secure the safety and reliability of Ni12% STS316L steel, a piping material for hydrogen storage tanks. The fatigue limits of non-LP and LP smooth specimens were determined, and the harmless crack depth (a<SUB>hml</SUB>) of the crack aspect ratio (As) 0.1~1.0 via the LP was evaluated. In addition, a<SUB>hml</SUB> was compared with As, the crack depth that reduces the fatigue limit (a<SUB>25</SUB>, a<SUB>50</SUB>), and the crack depth (a<SUB>NDI</SUB>) detectable in NDI. All crack harmless conditions were determined at the crack deepest point (point A). a<SUB>hml</SUB> is 0.418~0.539 mm, and this value can be evaluated as K<SUB>th(l)</SUB> of a long crack. a<SUB>hml</SUB> did not significantly depend on As. If the crack detected after NDI is not peened after repair, then NDI1, which has a very high crack detection probability, must be performed.