Effect of High-Strength Filler Metals on Fatigue

Stoschka, Michael; Leitner, Martin; Fössl, Thomas; Posch, Gerhard

doi:10.1007/bf03321332

Cited by 22 publications

(8 citation statements)

References 7 publications

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“…The manufacturing of the T-joint specimen was conducted according to a previous work methodology given in [26] to ensure comparability of the test results. The base plate and the transversal stiffener consist of a high-strength steel S690 with 5 mm sheet thickness.…”

Section: Specimen Manufacturingmentioning

confidence: 99%

“…Subsequently, the second pass is welded in reverse direction and the array is finally unclamped after again reaching steady-state room temperature. In order to achieve certain levels of specimen distortions, some arrays are pre-stressed by a wire, which is placed beneath the array before final clamping; details are provided in [26]. Three different states of distortion are studied leading to different clamping-induced mean stresses at the weld toe: Overall, five arrays are welded per distortion state resulting in a total number of 120 specimens.…”

Section: Specimen Manufacturingmentioning

confidence: 99%

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Impact of Angular Distortion on the Fatigue Performance of High-Strength Steel T-Joints in as-Welded and High Frequency Mechanical Impact-Treated Condition

Ottersböck

Leitner

Stoschka

2018

Metals

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In general, distortion has significant effects on the assembly process of welded structures and remarkable influences on the strength of the welds. Therefore, this work focuses on the effect of angular welding distortion on fatigue strength to improve transferability of specimen results to components. Experimental investigations cover manufacturing and fatigue testing of three single-sided transversal stiffeners series exhibiting different angular distortions. The fatigue test results of as-welded specimen show a distinct link between fatigue performance and initial angular distortion. However, in case of a high frequency mechanical impact (HFMI)-treated weld toe, the fatigue strength increases up to base material level and is independent of the distortion. A comprehensive numerical analysis reveals a complex interaction between the applied nominal load, initial specimen distortion and the local stress field. In this context, an engineering-feasible assessment is derived to estimate the local effective stresses featuring the acting local stress range as well as the stress ratio. The application of this distortion factor enables the setup of a uniform S/N-curve with a significantly reduced scatter band.

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Section: Specimen Manufacturingmentioning

confidence: 99%

Section: Specimen Manufacturingmentioning

confidence: 99%

Impact of Angular Distortion on the Fatigue Performance of High-Strength Steel T-Joints in as-Welded and High Frequency Mechanical Impact-Treated Condition

Ottersböck

Leitner

Stoschka

2018

Metals

Self Cite

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“…A clear difference is observed in both fatigue life and slope between the two batches, with a higher life and slope for Batch 1; see Figure 9A. The filler material strength generally does not have an effect on welded joint fatigue strength 45 . To study the potential effect of filler material here, the weld geometries of the two batches are investigated.…”

Section: Discussionmentioning

confidence: 99%

Fatigue strength assessment of cover plate joints subjected to axial and bending loading

Håkansson

Zhu

Barsoum

et al. 2023

Fatigue Fract Eng Mat Struct

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This study investigates stress‐based fatigue assessment methods to determine their applicability to welded cover plate joints subject to axial and bending loading. The nominal stress (NS), hot spot stress (HSS), 1 mm stress (OM), effective notch stress (ENS), theory of critical distances (TCD), and stress averaging (SA) methods are covered, and their accuracy and reliability are evaluated. To the best of the authors' knowledge, there is limited fatigue test data available for cover plate joints subjected to bending loading. In this study, fatigue tests are performed with cover plate joints under axial and bending loading. Evaluation of the fatigue assessment methods is based on the test results. It is observed that for axial loading, the ENS and OM method have the highest accuracy. For bending, the OM method is non‐conservative, and the other methods are overly conservative. Using design curves recommended for thin‐walled welded joints subjected to bending highly improves accuracy.

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“…According to IIW recommendations [1], this thickness correction factor is basically considered as a reduction factor for welded joints with plate thicknesses exceeding 25 mm. However, if experimental data are available, an increase in strength can be considered for thinner structures, as also indicated in [28] and [29]. Based on an effective thickness t eff = 10 mm, the joint category, and the weld condition, a thickness correction exponent of n = 0.3 is obtained for the as-welded state.…”

Section: Nominal Stress Approachmentioning

confidence: 99%

Fatigue strength assessment of TIG-dressed high-strength steel cruciform joints by nominal and local approaches

et al. 2022

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According to the IIW recommendation, the fatigue strength of welded steel joints is defined as independent of the base material in case of the as-welded condition. However, post-treatment techniques can improve the fatigue performance of welded structures, especially for increased base material strengths. Therefore, this paper investigates the effect of TIG dressing, as common post-weld treatment method, on the fatigue strength of high-strength steel S700 cruciform joints. The statistically evaluated fatigue test results reveal a significant increase of the nominal fatigue strength from FAT 90 for the as-welded up to 182 MPa for the TIG-dressed state. The experiments are further compared to recommended and suggested design curves applying both nominal as well as local stress approaches. Focusing on the TIG-dressed state, the suggested increase in nominal stresses is well validated leading to a conservative assessment. In addition, the proposed slope in the finite life region with a value of m1 = 4 shows a sound fit to the statistically evaluated value of m1 = 4.7 for the test results. The local fatigue strength estimation is performed based on a recent proposal using the theory of critical distances. Therefore, linear elastic numerical analysis of the investigated specimens is performed. Again, the resulting S-N curves agree well to the experiments validating the proposed local design approach.

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Effect of High-Strength Filler Metals on Fatigue

Cited by 22 publications

References 7 publications

Impact of Angular Distortion on the Fatigue Performance of High-Strength Steel T-Joints in as-Welded and High Frequency Mechanical Impact-Treated Condition

Impact of Angular Distortion on the Fatigue Performance of High-Strength Steel T-Joints in as-Welded and High Frequency Mechanical Impact-Treated Condition

Fatigue strength assessment of cover plate joints subjected to axial and bending loading

Fatigue strength assessment of TIG-dressed high-strength steel cruciform joints by nominal and local approaches

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