Investigation of distortion-induced fatigue cracked welded details using 3D crack propagation analysis

Aygül, Mustafa; Al‐Emrani, Mohammad; Barsoum, Zuheir; Leander, John

doi:10.1016/j.ijfatigue.2014.02.014

Cited by 34 publications

(15 citation statements)

References 15 publications

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“…In addition, phase transformations affect the distortion by changes of the inherent strain state within the heat-affected zone [5]. The distorted state of the joints affects the assembling process of welded structures and has remarkable influence on the strength of the weld [6][7][8]. Therefore, numerous recent publications deal with the estimation of welding distortion using transient thermo-mechanical simulation techniques or inherent strain methods [9][10][11].…”

Section: Introductionmentioning

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

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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: Introductionmentioning

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

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“…Extensive researches on accurate fatigue assessment methods have been conducted by numerous scholars. Various numerical fatigue assessment methods such as hot spot stress method (HSS) [2][3][4], effective notch stress method [5], continuum damage mechanics (CDM) method [6,7] and linear elastic fracture mechanics (LEFM) [8,9] have been developed. Among these methods, LEFM is demonstrated to be a powerful tool to facilitate fatigue assessment due to the fact that initial cracks in real structures are unavoidable.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation and numerical simulation on fatigue crack behavior of bridge steel WNQ570 base metal and butt weld

Zong

Shi

Wang

2015

Construction and Building Materials

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“…Several experimental studies (Hartman 2013;Alemdar et al 2013a), field-test measurements (Khalil et al 1998;Shifferaw and Fanous 2013;Tarries 2002) and numerical analyses (Mahmoud and Miller 2015;Hartman et al 2010;Alemdar et al 2013b;Zhao and Kim Roddis 2007;Aygül et al 2014) have been conducted to investigate distortioninduced fatigue cracking and to propose effective repair measures. However, selection of an appropriate repair strategy is complicated and depends on many factors (Alavi et al 2017).…”

Section: Introductionmentioning

confidence: 99%

Evaluation and upgrading web-gap distortion retrofits in steel girder bridges

Motaleb

Ibrahim

Lindquist

et al. 2019

Int J Adv Struct Eng

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Distortion-induced fatigue cracking in the unstiffened web-gap of cross-frame diaphragms is the most prevalent type of cracking in steel girder bridges. Multi-steel girder bridges experience differential deflection between adjacent girders when subject to vertical loads resulting in a driving force in cross-frame diaphragms. The driving force developed in the crossframe legs leads to out-of-plane distortion of the web-gap which results in high stress concentrations at the area, following by fatigue damages. This paper introduces an innovative method to retrofit web-gap distortion cracking, upgrade existing retrofits, and compare its effectiveness with two common retrofit techniques. The method involves cutting the existing connection plate and using angles to attach the disconnected part of the connection plate to the web. The method intends to eliminate the local high stresses at the connection plate end with considering minimal interference in original connection design and load path. Also, two other conventional repair methods were investigated, slot method and top-angle measure, to use as a basis for comparing the methods effectiveness. Laboratory testing was performed on a small-scale steel bridge bay by applying a vertical displacement to the free end of a cross-frame diaphragm to simulate the differential deflection between two adjacent girders in real bridges. The results from the testing were compared to findings from finite element analyses (FEA). Test results as well as FEA results for all investigated retrofit techniques are presented herein. Results showed that the newly developed slot-angle technique has significant potential for effectively reducing the stress concentrations in the web-gap region by removing the location of initial stress concentrations and redistributing those stresses over a wider area.Publisher's Note Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.

show abstract

Investigation of distortion-induced fatigue cracked welded details using 3D crack propagation analysis

Cited by 34 publications

References 15 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

Experimental investigation and numerical simulation on fatigue crack behavior of bridge steel WNQ570 base metal and butt weld

Evaluation and upgrading web-gap distortion retrofits in steel girder bridges

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