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 evalua...
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https://www.riss.kr/link?id=A108136302
2022
-
KCI등재
학술저널
239-245(7쪽)
0
상세조회0
다운로드다국어 초록 (Multilingual Abstract)
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 evalua...
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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