Fatigue strength assessment of butt-welded joints with undercuts

Steimbreger, Ceferino; Chapetti, Mirco Daniel

doi:10.1016/j.ijfatigue.2017.09.011

Cited by 29 publications

(33 citation statements)

References 44 publications

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“…In this way, it is possible to define which the main parameters for a given configuration are and to found the worst cases or limit values for them, according to the welding procedures and qualities. For instance, in a recent publication [10] we have shown that depth is the principal variable affecting fatigue behavior of butt-welded components with undercuts. Even though analysis based on continuum mechanics generally consider stress concentration factor as the controlling parameter, they fail to explain the importance of undercut depth in current regulations.…”

Section: Previous Analysis and Resultsmentioning

confidence: 99%

“…Previous works have been done by using the proposed method in order to analyze the influence of different weld geometry parameters on the fatigue resistance of welded joints, like plate thickness, reinforcement angle, weld toe geometry, defect sizes and undercuts [7][8][9][10]. Results showed that the method allows understanding the influence of the different mechanical, geometrical and microstructural parameters on the definition of the fatigue resistance of the joint.…”

Section: Previous Analysis and Resultsmentioning

confidence: 99%

“…Results exposed in reference [10] highlight the importance of not only undercut depth, but also threshold for fatigue crack propagation and nonpropagating crack length, when designing against fatigue damage. In search of a conservative simplification for the estimation of the lowest fatigue limit of butt-welds with undercuts, a simple relation was then established between fatigue limit, crack propagation threshold, notch depth and maximum non-propagating crack length [10]: (5) where a np-max is the maximum non-propagating crack length for a given notch depth, as indicated before, and ∆K th is the threshold value when a = D + a np-max .…”

Section: Previous Analysis and Resultsmentioning

confidence: 99%

“…In search of a conservative simplification for the estimation of the lowest fatigue limit of butt-welds with undercuts, a simple relation was then established between fatigue limit, crack propagation threshold, notch depth and maximum non-propagating crack length [10]: (5) where a np-max is the maximum non-propagating crack length for a given notch depth, as indicated before, and ∆K th is the threshold value when a = D + a np-max . F and f are constants that depend on the weld detail without undercut, i.e.…”

Section: Previous Analysis and Resultsmentioning

confidence: 99%

“…Details of the method and some applications can be found on reference [7,8], [9] and [10]. In this work a simple expression to estimate the fatigue endurance of welded joints is proposed on the bases of the results of previous analysis and results [7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

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A simple expression to estimate the fatigue endurance of welded joints

Chapetti

Steimbreger

2018

MATEC Web Conf.

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Abstract.A simple expression is proposed to estimate the fatigue endurance of welded joints that can be used to understand and analyze in a simple way the influence of the main geometrical, mechanical and material effects (weld geometry, local geometry, material properties, residual stresses and size of defects). The proposed expression was derived from the results of the analysis of the fatigue strength of welds studied by means of a fracture mechanics approach that takes into account the fatigue behavior of short cracks by using the resistance curve method. For that purpose numerical simulation of transversely stressed butt, T and cruciform joints were performed.

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Section: Previous Analysis and Resultsmentioning

confidence: 99%

Section: Previous Analysis and Resultsmentioning

confidence: 99%

Section: Previous Analysis and Resultsmentioning

confidence: 99%

Section: Previous Analysis and Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A simple expression to estimate the fatigue endurance of welded joints

Chapetti

Steimbreger

2018

MATEC Web Conf.

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Kerbfallkombinationsmodell zur Berücksichtigung von Schweißnahtimperfektionen beim Ermüdungsnachweis

Bartsch,

Feldmann

2024

Stahlbau

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Fertigungsbedingte Imperfektionen treten in jeder Schweißnaht auf, die insbesondere in ermüdungsbeanspruchten Stahlkonstruktionen, wie z. B. Stahlbrücken, eine große Rolle spielen. Denn diese Schweißnahtimperfektionen beeinflussen die Ermüdungsfestigkeit der Schweißverbindung. Die Verknüpfung der Ermüdungsfestigkeitswerte mit dem Qualitätsniveau der Schweißverbindungen ist jedoch bisher nur unzureichend geschehen. Die Größen tolerierbarer Schweißnahtimperfektionen sind zwar gemäß DIN EN 1090‐2, DIN EN 1993‐1‐9 und DIN EN ISO 5817 vorgegeben, doch sie wurden ohne wissenschaftlichen Hintergrund festgelegt. Die wahren Grenzwerte sind unbekannt. Dies bot den Anlass, eine Methode zu entwickeln, mit der Kerbfälle abhängig von der Größe der Schweißnahtimperfektionen bestimmt werden können. Auf Basis von Ermüdungsversuchen geschweißter Details des Kreuzstoßes und der Quersteife mit Imperfektionen wurden numerische Untersuchungen mithilfe der Finite‐Elemente‐Methode und lokaler Ermüdungskonzepte durchgeführt. Die Ergebnisse dieser Berechnungen liefern einen quantitativen Zusammenhang zwischen Ermüdungsfestigkeit und Größe einzelner Schweißnahtimperfektionen. Zusätzlich wurde das Kerbfallkombinationsmodell entwickelt, mit dem mehrere Imperfektionen auf probabilistische Weise im Kerbfall effizient berücksichtigt werden können. Da bei Anwendung des vorgestellten Verfahrens zeitaufwendige Überarbeitungen von Schweißnähten in Zukunft entfallen können, wird das Nachweiskonzept für ausreichende Sicherheit gegen Ermüdungsversagen hinsichtlich der Kosten‐ und Ressourceneffizienz verbessert.

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Local weld geometry-based characterization of fatigue strength in laser-MAG hybrid welded joints

2023

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This research studies the influence of local weld notch parameters on fatigue crack initiation sites in laser-hybrid butt welds, utilizing high-resolution 3D scans and fatigue tests to failure. The suitability of different local geometric weld notch parameters for fatigue strength characterization is investigated, and the current challenges associated with their measurements are highlighted. The weld notch shapes were found to fluctuate significantly, resulting in considerable variation in notch parameters over short intervals. Undercut depth was found to determine the critical location for crack initiation. There were several instances where the fatigue crack initiated from notches with large radii despite the presence of sharper notches, contrary to what is expected on the basis of previous investigations. The results of the present study indicate that the undercut depth is a suitable fatigue strength indicator for high-quality laser-MAG hybrid welds, overcoming the practical limitations of notch radius measurement.

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Fatigue strength assessment of butt-welded joints with undercuts

Cited by 29 publications

References 44 publications

A simple expression to estimate the fatigue endurance of welded joints

A simple expression to estimate the fatigue endurance of welded joints

Kerbfallkombinationsmodell zur Berücksichtigung von Schweißnahtimperfektionen beim Ermüdungsnachweis

Local weld geometry-based characterization of fatigue strength in laser-MAG hybrid welded joints

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