Fatigue damage of welded high-strength steel details improved by post-weld treatment subjected to critical cyclic loading conditions

Nazzal, Salim Sleiman; Mikkola, Eeva; Yıldırım, Halid Can

doi:10.1016/j.engstruct.2021.111928

Cited by 8 publications

(6 citation statements)

References 28 publications

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“…This study investigates the effect of surface roughness on residual stress relaxation and fatigue damage when the high-peak load is applied to HFMI-treated high-strength steel welded joints. The existing numerical approach for HFMI-treated joints is mainly based on simplified smooth geometries [20][21][22]; thus, the influence of surface roughness on residual stress relaxation and fatigue life estimation has been neglected. In this study, this influence is highlighted by comparing the simplified and actual HFMI geometry models.…”

Section: Discussionmentioning

confidence: 99%

“…The simulations were utilized for the analysis of residual stress relaxation. Mikkola et al [20], Nazzal et al [21], and Ono et al [22] assessed fatigue damage related to crack initiation under various loading scenarios by using local strain and mean stress after the residual stress relaxation. The results have shown that residual stress relaxation greatly influences fatigue damage.…”

Section: Introductionmentioning

confidence: 99%

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Local relaxation of residual stress in high-strength steel welded joints treated by HFMI

Ono,

Remes,

Kinoshita

et al. 2024

Weld World

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This research studies the influence of high-peak loads on local relaxation of residual stress and fatigue damage in high-strength steel welded joints treated by high-frequency mechanical impact (HFMI) treatment. The joint behavior is simulated with elastic–plastic finite element analyses that account for the combined effect of geometry, residual stress, and material properties. This simulation uses two treated geometry models: with or without surface roughness on HFMI groove, and two material properties: S690QL and AH36 structural steels. The results show that surface roughness and load history, including high-peak loads, significantly influence fatigue response. It is revealed that the model neglecting the surface roughness cannot represent the amount of residual stress change and fatigue damage at less than 100 µm depth from the surface. In addition, the local yield strength in the HFMI-treated zone affects the plasticity behavior near the surface imperfection under the high-peak loads, which provides comparatively different fatigue damage between S690QL and AH36 in some cases. As a result, this study provides the further understanding needed to develop a robust modeling approach to the fatigue life estimation of HFMI-treated welds subjected to high-peak loads.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Local relaxation of residual stress in high-strength steel welded joints treated by HFMI

Ono,

Remes,

Kinoshita

et al. 2024

Weld World

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“…However, as shown in Section 2.1, there are various material properties such as weld metal, HAZ, base metal, and hardened metal in and around HFMI-treated regions. As the hardened metal due to the HFMI has higher local yield strength compared to the base metal [24,25,28], it might limit the amount of residual stress relaxation. On the other hand, the local yield strength of coarse-grained HAZ has been found to be slightly lower than that of the base metal [24,28,41], thus probably changing the residual stress distribution around the HFMItreated region.…”

Section: Methodsmentioning

confidence: 99%

Damage-Based Assessment of the Fatigue Crack Initiation Site in High-Strength Steel Welded Joints Treated by HFMI

Ono

Yıldırım

Kinoshita

et al. 2022

Metals

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This study aimed to identify the fatigue crack initiation site of high-frequency mechanical impact (HFMI)-treated high-strength steel welded joints subjected to high peak stresses; the impact of HFMI treatment residual stress relaxation being of particular interest. First, the compressive residual stresses induced by HFMI treatment and their changes due to applied high peak stresses were quantified using advanced measurement techniques. Then, several features of crack initiation sites according to levels of applied peak stresses were identified through fracture surface observation of failed specimens. The relaxation behavior was simulated with finite element (FE) analyses incorporating the experimentally characterized residual stress field, load cycles including high peak load, improved weld geometry and non-linear material behavior. With local strain and local mean stress after relaxation, fatigue damage assessments along the surface of the HFMI groove were performed using the Smith–Watson–Topper (SWT) parameter to identify the critical location and compared with actual crack initiation sites. The obtained results demonstrate the shift of the crack initiation most prone position along the surface of the HFMI groove, resulting from a combination of stress concentration and residual stress relaxation effect.

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“…The fatigue capacity of structural steels in offshore applications is affected by various parameters, each of which can influence the quality and the mechanical properties. Although there are many reports on fatigue testing on structural steels, this review covers a representative number of studies 18–47 focusing on S355 butt‐welded structural steels. These structural steels have been tested using a variety of test setups, loading conditions, welding types, and other postprocessing variables.…”

Section: Introductionmentioning

confidence: 99%

“…In addition to the reviewed literature, 18–47 S‐N data from the design code standards BS7606, 50 DNVGL‐RP‐C203, 51 BS‐EN1993‐1‐9, 52 and IIW recommendations 53 were also considered. The codes provided S‐N curve values in both air and corrosive conditions in artificial seawater (ASW) and salt spray chambers (SSC).…”

Section: Introductionmentioning

confidence: 99%

Corrosion surface morphology‐based methodology for fatigue assessment of offshore welded structures

Okenyi,

Afazov,

Mansfield

et al. 2023

Fatigue Fract Eng Mat Struct

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This work employed a novel corrosion‐based fatigue model to determine the fatigue life of offshore welded structures to enable the fatigue assessment of welds under corrosive conditions. In addition to the material's ultimate strength, endurance limit, and stress ratio (mean stress effect), the model includes a corrosion factor concept to account for the impact of corrosion pits on the fatigue performance of welded S355 steel, which is the novel contribution in this paper. X‐ray computed tomography scans of corroded S355 specimens in a salt spray chamber were characterized. Surface texture characterization was employed to obtain surface roughness, size, and aspect ratio of corrosion pits. The corrosion factor was determined based on notch and surface fatigue theories using the characterized pit size, aspect ratio, and surface roughness. Fatigue S‐N curves were then predicted for critical pits and compared against the fatigue code DNVGL‐RP‐C203 and experimental data from the literature. The novel approach combining corrosion characterization method with corrosion‐based fatigue model for the prediction of fatigue S‐N curves provided a minor deviation of only 2.8% between predicted and measured data. This approach can potentially be integrated into predictive frameworks for the remaining life assessment of offshore structures.

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Fatigue damage of welded high-strength steel details improved by post-weld treatment subjected to critical cyclic loading conditions

Cited by 8 publications

References 28 publications

Local relaxation of residual stress in high-strength steel welded joints treated by HFMI

Local relaxation of residual stress in high-strength steel welded joints treated by HFMI

Damage-Based Assessment of the Fatigue Crack Initiation Site in High-Strength Steel Welded Joints Treated by HFMI

Corrosion surface morphology‐based methodology for fatigue assessment of offshore welded structures

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