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Title |
Assessment of Fatigue Life of Out-Of-Plane Gusset Welded Joints using 3D Crack Propagation Analysis
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Authors |
정영수(Young-Soo Jeong) ; 카이누마 시게노부(Shigenobu Kainuma) ; 안진희(Jin-Hee Ahn) ; 이원홍(Wong-Hong Lee) |
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DOI |
https://doi.org/10.11112/jksmi.2018.22.1.129 |
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Keywords |
피로 ; 피로균열 진전해석 ; 응력확대계수 ; 면외거셋 용접이음 Fatigue ; Fatigue crack propagation analysis ; Stress intensity factor ; Out-of-plane gusset welded joint |
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Abstract |
The estimation of the fatigue design life for large welded structures is usually performed using the liner cumulative damage method such as Palmgren-Miner rule or the equivalent damage method. When a fatigue crack is detected in a welded steel structure, the residual service life has to be estimated base on S-N curve method and liner elastic fracture mechanics. In this study, to examine the 3D fatigue crack behavior and estimate the fatigue life of out-of-plane gusset fillet welded joint, the fatigue tests were carried out on the model specimens. Investigations of three-dimensional fatigue crack propagation on gusset welded joint was used the finite element analysis of FEMAP with NX NASTRAN and FRANC3D. Fatigue crack growth analysis was carried out to demonstrate the effects of aspect ratio, initial crack length and stress ratio on out-of-plane gusset welded joints. In addition, the crack behaviors of fatigue tests were compared with those of the 3D crack propagation analysis in terms of changes in crack length and aspect ratio. From this analysis result, SIFs behaviors and crack propagation rate of gusset welded joint were shown to be similar fatigue test results and the fatigue life can also be predicted.
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