Estimation of the fatigue life according to lap joint weld profiles for ferritic stainless steel

Kim, Jae-Song; Lee, Kyung-Min; Lee, Bo-Young

doi:10.1016/j.proeng.2011.04.328

Cited by 4 publications

(2 citation statements)

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“…When fatigue testing is performed, the load type, stress level, load ratio, joint morphology, and stress concentration of welded joints are several important factors that aggravate fatigue crack initiation and propagation [ 17 , 18 , 19 ]. In the fatigue test of T-joints and lap joints, the fatigue performance often decreases, mainly due to large stress concentration caused by uneven joint morphology [ 20 , 21 , 22 , 23 , 24 ]. With the increase of stress concentration, the time of crack initiation is shortened, and crack initiation increases the risk of sudden fracture [ 25 ].…”

Section: Introductionmentioning

confidence: 99%

“…There is a significant correlation between joint morphology and stress concentrations, which can be larger within lap joints and can sometimes be a major cause of fatigue fracture, adding extra risk of use [ 20 , 21 , 22 ]. Therefore, it is of great significance to study the fatigue fracture and its inducement of welded lap joints [ 24 ].…”

Section: Introductionmentioning

confidence: 99%

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Microstructure, Fatigue Properties and Stress Concentration Analysis of 6005 Aluminum Alloy MIG Welded Lap Joint

Yang

Zhao

et al. 2022

Materials

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This paper studies the microstructure and mechanical properties of MIG (Melt Inert Gas) lap welded 6005 aluminum alloy plates. Microstructure analysis (OM) of the joint showed that 15~30 μm small grains were observed at the fusion line. Mechanical analysis shows that the small grains are broken by shielding gas and molten pool flow force. Hardness test shows that there is a softening zone (41~43 HV) in HAZ much lower than BM and WZ. The low cycle fatigue test showed that the performance of lap joint decreased sharply, and the fatigue strength of weld decreased significantly, which was only 27.34% of the base metal. The fatigue fracture (SEM) of the weld observed slip band cracking and a large number of brittle fracture characteristics. Using the stress concentration factor Kt for analysis, it was found that the cause of brittle fracture was mostly stress concentration. Lap joint stress concentration model appears in two ways: firstly, at the weld toe, the weld is subjected to eccentric force, secondly, there is a small gap between the two plates at the weld root, which cracks along the direction of 45° of the maximum shear stress.

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