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- 주제어 : Harmless Crack Depth (검색결과 3 건)
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이금화,구경희,김재훈,윤서현,권영국,남기우,Lee, Gum-Hwa,Gu, Kyoung-Hee,Kim, Jae-Hoon,Yun, Seo-Hyun,Kwon, Yung-Kug,Nam, Ki-Woo 한국산업융합학회 2022 한국산업융합학회 논문집 Vol.25 No.5
Using the fatigue limit (△σ<sub>unsm</sub>) and residual stress (σ<sub>r</sub>) of the UNSM smooth specimen, the harmless maximum crack depth (α<sub>hml</sub>) according to the crack aspect ratio (As) was evaluated. α<sub>hml</sub> evaluated the reliability in the relationship between the minimum crack depth (α<sub>NDI1</sub>, α<sub>NDI2</sub>) detectable by nondestructive inspection(NDI) and the crack depth (α<sub>25</sub>, α<sub>50</sub>) that reduces the fatigue limit by 25% and 50%. All α<sub>hml</sub> was determined by the crack depth. The α<sub>hml</sub> of 80N UNSM with high σ<sub>r</sub> and high △σ<sub>unsm</sub> was found to be large. σ<sub>r</sub> in the depth direction had a much effect on α<sub>hml</sub>. Since α<sub>hml</sub>>α<sub>50</sub>(As=0.6-0.1) and α<sub>hml</sub>>α<sub>25</sub>, α<sub>25</sub> and α<sub>50</sub>(some range) can secure the safety and reliability. Since α<sub>hml</sub><α<sub>50</sub> (As=1. 0-0. 6), it cannot be made harmless by UNSM. So safety and reliability cannot be secured. α<sub>NDI1</sub> and α<sub>NDI2</sub> are larger than α<sub>25</sub>, α<sub>25</sub> cannot be detected by NDI. α<sub>NDI1</sub> and α<sub>NDI2</sub> are smaller than α<sub>50</sub>, α<sub>25</sub> can detected by NDI.
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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.
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초음파 나노 결정 표면개질된 SCM435의 특이한 피로 파괴 특성
김재훈 ( Jae-hoon Kim ),윤서현 ( Seo-hyun Yun ),남기우 ( Ki-woo Nam ) 한국산업융합학회 2022 한국산업융합학회 논문집 Vol.25 No.2
Using the fatigue limit (△σ<sub>unsm</sub>) and residual stress (σ<sub>r</sub>) of the UNSM smooth specimen, the harmless maximum crack depth (a<sub>hlm</sub>) according to the crack aspect ratio (As) was evaluated. In addition, the relationship between the minimum crack depth (a<sub>NDI1</sub>, a<sub>NDI2</sub>) detectable by non-destructive inspection(NDI), the crack depth (a<sub>25</sub>, a<sub>50</sub>) that reduces the fatigue limit by 25% and 50%, and a<sub>hlm</sub> were evaluated. The harmless crack condition was determined by the deepest crack point (point A). Since a<sub>hlm</sub> is larger than a<sub>25</sub> and a<sub>50</sub>, a<sub>25</sub> and a<sub>50</sub> can secure the safety and reliability of steel via UNSM. Because a<sub>NDI1</sub> and a<sub>NDI2</sub> are larger than a<sub>25</sub> and a<sub>50</sub>, cracks in a<sub>25</sub> and a<sub>50</sub> cannot be detected by non-destructive testing. Therefore it is necessary to apply more precise NDI.
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