Interpretation of Overload Effects Under Spectrum Loading of Welded High-Strength Steel Joints

Sonsino, Cetin Morris; Fmann, Heinz Kau; Wagener, Rainer; Fischer, Christian; Eufinger, J.

doi:10.1007/bf03321544

Cited by 26 publications

(16 citation statements)

References 7 publications

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“…1. There are many parameters which, in all current assessment methods, i. e. fracture mechanics or cumulative damage, lead to these uncertainties in fatigue lifing [28,29,30]. All suggested methods within both paths reveal severe limitations and therefore a generally valid method cannot be proposed.…”

Section: Fatigue Lifing By Cumulative Damagementioning

confidence: 93%

Lightweight-structural durability design by consideration of variable amplitude loading

Sonsino

Heim

Melz

2016

International Journal of Fatigue

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Section: Fatigue Lifing By Cumulative Damagementioning

confidence: 93%

Lightweight-structural durability design by consideration of variable amplitude loading

Sonsino

Heim

Melz

2016

International Journal of Fatigue

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“…In the crack initiation period, variable loads influence the mean stress (stable residual stress) due to local plastification [43]. These effects can be assessed directly by the application of the strain-life approach using damage parameters P or mean stress sensitivities M [44]. In any case, an elastic-plastic evaluation is needed.…”

Section: Methodical Approachmentioning

confidence: 99%

Enhancement of the fatigue strength assessment of welded components by consideration of mean and residual stresses in the crack initiation and propagation phases

Baumgartner

2016

Weld World

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The starting point of the investigations presented in this paper is the simplified consideration of mean and residual stresses as well as the complete disregard of the complex failure mechanisms in the common fatigue standards and guidelines. An improved fatigue life assessment for welded components, which includes the crack initiation and propagation phase is the scope of this paper. The crack initiation phase is considered using the strain-life approach. The crack propagation life, starting from a technical crack of a depth of a = 0.5 mm, is derived by the application of linear-elastic fracture mechanics. In this two-phase approach, the mean and residual stresses are considered by using damage parameters for the initiation phase and effective stress intensity factors for the propagation phase. With this approach, a better understanding can be obtained of the influence of mean- and residual stresses and their influence on the course (slope k and knee point Nk) of the S-N curve. With this information to hand, a more reliable fatigue assessment can be achieved than is possible with the common standards and guidelines. With the proposed two-phase approach, higher permissible stresses can be allowed in the design phase, leading to resource-efficient, lightweight constructions

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“…Thus, the precondition for a reliable tool for quality control in practice without any specific limitations is basically given. As the experiences published in different references [20,21,24,25] evidently show, the initial residual stresses are obviously of minor importance. Finally, only stabilized residual stresses at the critical sites can be used.…”

Section: Concept Ideamentioning

confidence: 99%

“…where residual stresses are handled as mean stresses as correspondingly applied in [1,7,9,24]. However, it is not really surprising that both equations cannot be reasonable, since this leads to a strong overestimation of the residual stress effect.…”

Section: Fundamentalsmentioning

confidence: 99%

An enhancement of the current design concepts for the improved consideration of residual stresses in fatigue-loaded welds

Nitschke–Pagel

Hensel

2021

Weld World

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The consideration of residual stresses in fatigue-loaded welds is currently done only qualitatively without reliable knowledge about their real distribution, amount and prefix. Therefore, the tools which enable a more or less unsafe consideration in design concepts are mainly based on unsafe experiences and doubtful assumptions. Since the use of explicitly determined residual stresses outside the welding community is state of the art, the target of the presented paper is to show a practicable way for an enhanced consideration of residual stresses in the current design tools. This is not only limited on residual stresses induced by welding, but also on post-weld treatment processes like HFMI or shot peening. Results of extended experiments with longitudinal fillet welds and butt welds of low and high strength steels evidently show that an improved use of residual stresses in fatigue strength approximation enables a better evaluation of peening processes as well as of material adjusted welding procedures or post-weld stress relief treatments. The concept shows that it is generally possible to overcome the existing extremely conservative but although unsafe rules and regulations and may also enable the improved use of high strength steels.

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Interpretation of Overload Effects Under Spectrum Loading of Welded High-Strength Steel Joints

Cited by 26 publications

References 7 publications

Lightweight-structural durability design by consideration of variable amplitude loading

Lightweight-structural durability design by consideration of variable amplitude loading

Enhancement of the fatigue strength assessment of welded components by consideration of mean and residual stresses in the crack initiation and propagation phases

An enhancement of the current design concepts for the improved consideration of residual stresses in fatigue-loaded welds

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