Fatigue crack initiation assessment of welded joints accounting for residual stress

Dong, Yizhe; Garbatov, Y.; Soares, C. Guedes

doi:10.1111/ffe.12824

Cited by 27 publications

(12 citation statements)

References 59 publications

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“…In addition, compressive residual stress also increases the threshold value of the crack initiation. The crack initiating would be prevented in the compressive residual stress affected layer, which remarkably reduces the occurring probability of fatigue crack initiation [32,33,34,35]. For the microscopic cracks already established in the materials, compressive residual stress can arrest the crack into closure and maybe lead to a non-propagating crack [36,37].…”

Section: Resultsmentioning

confidence: 99%

Effect of Residual Stress on S–N Curves and Fracture Morphology of Ti6Al4V Titanium Alloy after Laser Shock Peening without Protective Coating

Pan

Zhou

et al. 2019

Materials

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In this paper, the effect of residual stress on the stress–life (S–N) curve and fracture morphology characteristics of Ti6Al4V titanium alloy after laser shock peening (LSP) without protective coating was experimentally investigated. The fatigue test and residual stress measurement were conducted on specimens before and after the LSP process. It was shown that LSP produced a high-amplitude compressive residual stress field on the surface of the specimen. After the LSP process, the fatigue life limit was increased by 16%, and the S–N curve shifted upward. Then, based on the theory of mean stress, the mechanism whereby the compressive residual stress improves the fatigue life of Ti6Al4V titanium alloy was analyzed. It indicated the improvement in fatigue life was because of the high-amplitude compressive residual stress on the surface and in depth induced by LSP to reduce the tensile stress produced by external loading. In addition, the scanning electron microscope (SEM) pattern of fatigue fracture demonstrated distinct differences in the fracture morphology before and after LSP. After LSP, the crack initiation sites of the samples moved to the subsurface where it was difficult for fatigue cracks initiating here. Moreover, after the LSP process, there were high density of fatigue striations and many secondary cracks on the fracture of the treated specimen.

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Section: Resultsmentioning

confidence: 99%

Effect of Residual Stress on S–N Curves and Fracture Morphology of Ti6Al4V Titanium Alloy after Laser Shock Peening without Protective Coating

Pan

Zhou

et al. 2019

Materials

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“…Note that the effect of welding-induced residual stresses 27 is ignored here because the residual stress relaxation occurs due to the application of stress cycles with relatively high ranges. The residual stresses may be relaxed in a relatively short period comparing to the whole service life.…”

Section: Notch Strain Approachmentioning

confidence: 99%

Fatigue reliability of welded joints accounting for uncertainties in weld geometry

Gao

Zhang

Huang

et al. 2022

Advances in Mechanical Engineering

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Fatigue reliability assessment of welded joints can consider the uncertainties from various sources and can establish the design criteria and inspection plans. The present paper aims to address the uncertainties explicitly. The notch strain approach that accounts for the effects of the misalignment, local notch, and crack-like imperfection, which is referred to as secondary notch, is employed. Sensitivity analyses indicate that uncertainties in misalignment, flank angle, weld toe radius together with secondary notch are all important sources of the total uncertainty. The practical difficulty in the determination of the uncertainty models of the geometric parameters is discussed, and the acceptance limits for fabrication are used to derive the uncertainty models. And finally, the impacts of acceptance limits on the fatigue reliability of welded joints are assessed. The results indicate that the weld toe radius and secondary notch depth significantly affect the reliability index and the fatigue reliability increases with the weld quality of the welded joint becomes higher.

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“…Teng et al [9,10] evaluated the residual stress effect on the fatigue lifetime of butt welded plates based on thermal elastic-plastic analysis and the strain-life method. Dong et al [11] assessed the residual stress effect on fatigue crack initiation of fillet welds after ultrasonic impact treatment based on the local strain approach. Xin et al [8] investigated residual stresses on fatigue crack initiation of butt-welded plates made of high strength steels.…”

Section: Introductionmentioning

confidence: 99%

Residual stress effects on fatigue life prediction using hardness measurements for butt-welded joints made of high strength steels

Xin

Correia

Veljković

et al. 2021

International Journal of Fatigue

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The fatigue resistance of welded connections made of high strength steel (HSS) is one of the most important topics for the application of HSS in the construction sector. One of the most challenging issues is how to predict the fatigue life of welded structures with complex geometry based on the test results from relatively simple coupon specimens. However, there are generally pre-existing residual stresses in the welded coupon specimens during fatigue tests, and these residual stresses vary greatly in welded structures with complex geometry. This increases the difficulty in predicting the fatigue behaviour of welded structures based on results at coupon scale. Hence, it is important to establish a relationship between the residual stress independent material characteristics and fatigue life. The fatigue behaviour of complex welded structures can be predicted by this residual stress independent material characteristics calibrated at the coupon level and simulated local residual stress distribution. In this paper, the residual stress-free characteristics, hardness, is employed to predict the fatigue life of butt-welded joints. Besides, the residual stress of V-shaped butt welds on a plate made of high strength steels are analysed by modelling of the welding process based on subsequent thermal analysis and mechanical stress analysis by implementing kill/birth strategies. The results show that it contributes to a better prediction compared with experimental results after considering the residual stress effects.

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Fatigue crack initiation assessment of welded joints accounting for residual stress

Cited by 27 publications

References 59 publications

Effect of Residual Stress on S–N Curves and Fracture Morphology of Ti6Al4V Titanium Alloy after Laser Shock Peening without Protective Coating

Effect of Residual Stress on S–N Curves and Fracture Morphology of Ti6Al4V Titanium Alloy after Laser Shock Peening without Protective Coating

Fatigue reliability of welded joints accounting for uncertainties in weld geometry

Residual stress effects on fatigue life prediction using hardness measurements for butt-welded joints made of high strength steels

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