The strain-life approach applied to welded joints: Considering the real weld geometry

Ladinek, Markus; Niederwanger, Andreas; Lang, Robert E.; Schmid, Johannes; Timmers, Ralph; Lener, Gerhard

doi:10.1016/j.jcsr.2018.04.024

Cited by 18 publications

(5 citation statements)

References 12 publications

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“…[5] beinhaltet auch der Abschlussbericht zum FKM-Vorhaben "Richtlinie Nichtlinear" [4] [57] Material heterogeneity in the weld area, image adapted from [57] dieses Konzept auch in einer Neuauflage der bekannten FKM-Richtlinie [2]…”

Section: Berücksichtigung Der Stützwirkungunclassified

Nachweis der Ermüdungsfestigkeit mittels Kerbdehnungskonzept

et al. 2019

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Der Nachweis der Ermüdungsfestigkeit wird im Stahlbau hauptsächlich mithilfe des Nennspannungskonzepts geführt, was nicht zuletzt auf die aktuelle Normenlage zurückzuführen ist. Ist die Definition von Nennspannungen aufgrund der Bauteilkomplexität nicht mehr möglich, kann im Rahmen der EN 1993‐1‐9 der Nachweis mittels der Methode der korrigierten Nennspannungen oder mit dem Strukturspannungskonzept geführt werden. Eine Aussage über das örtliche Plastifizieren ist damit nicht möglich, jedoch ist dieses Verhalten implizit erfasst. Das Kerbdehnungskonzept ermöglicht eine Nachweisführung basierend auf lokalen Dehnungen im gekerbten Bereich unter Berücksichtigung plastischer Effekte. Neuere Forschungs‐ und Normungsbemühungen scheinen diesem Bemessungsansatz mehr Aufmerksamkeit zu schenken. Es darf vermutet werden, dass dadurch das Kerbdehnungskonzept auch im deutschsprachigen Raum in Zukunft mehr Akzeptanz und eine breitere Anwendung in der Bemessungspraxis erfahren wird. Da dieses Konzept einige Besonderheiten aufweist, soll der vorliegende Beitrag eine erste Einführung für in der Praxis tätige Ingenieure darstellen.

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Section: Berücksichtigung Der Stützwirkungunclassified

Nachweis der Ermüdungsfestigkeit mittels Kerbdehnungskonzept

et al. 2019

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“…Welded, bolted (also using preloaded bolts), or riveted connections have been very popular and often used in civil engineering structures. Their effectiveness is confirmed by a number of studies and analyses, including numerical simulations [1,2,3]. Unfortunately, each of these joint types introduces notches in the form of zones with different mechanical properties (welded joints) or openings interrupting material continuity (bolts).…”

Section: Introductionmentioning

confidence: 99%

The Methacrylate Adhesive to Double-Lap Shear Joints Made of High-Strength Steel—Experimental Study

et al. 2019

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In typical technical applications, steel components are usually connected by welding or with mechanical connectors. An alternative solution, typical in the aviation and automotive industry, but not widespread in engineering structures, is to join thin sheet metal using adhesives. The article presents an experimental study of adhesive joints used in overlap connections subjected to static tension. A methacrylate adhesive, selected experimentally from a range of adhesives, which combines the optimum strength and strain properties, was tested. The laboratory tests were carried out on double-lap specimens made of high-strength Domex 700 steel. On the basis of the experimental results, the behavior of the specimens and their failure mechanism, depending on the anchorage lengths used (200, 300 and 400 mm), are described. The tests confirmed the effectiveness of the selected methacrylate adhesive in a practical application. It was shown that with the appropriate anchorage length (adequate to the type of steel components and the joint geometry) between 300 and 400 mm, the capacity of the adhesive joint is higher than the capacity of a single steel component. Two types of specimen behavior were recognized: Quasi-brittle, which occurs at the anchorage length of 200 mm, and ductile, observed for 300 mm and 400 mm anchoring. In addition, thanks to the optical measurement method used, a detailed strain distribution on the specimen surface was determined. The data will be used for subsequent validation of an analytical and numerical model.

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“…Recent studies conducted by Quale et al [1] and Shojai et al [2] showed that crack initiation in fatigue tests on corroded specimens occurred at locations with high stress concentrations, resulting from pitting corrosion. With local concepts, which have so far been limited to the base material and weld seams [3][4][5][6][7][8][9][10][11], these stress concentrations can be considered in the fatigue analysis and enable a fatigue life evaluation based on the real surface geometry. In the context of maintenance of existing offshore wind turbines, there are novel efforts to capture the real surface geometry of corroded components with the so called replica technique, in which an imprint of the surface geometry is made and digitized in the laboratory with a 3D-scanner [12] and used to numerically analyse the stress concentrations due to pitting corrosion.…”

Section: Introductionmentioning

confidence: 99%

Fatigue stress concentrations analysis of real corroded steel structures based on replica imprints

Shojai,

Schaumann,

Momber

et al. 2023

ce papers

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The service life of offshore support structures is significantly reduced by corrosion. In particular, pitting corrosion leads to high local stress concentrations and can reduce the expected fatigue strength. Previous studies on corroded specimens have shown that crack development in fatigue tests is correlated with stress concentration. In the context of maintenance of existing offshore wind turbines, there are novel efforts to capture the real surface geometry of corroded components with the so‐called replica technique, in which an imprint of the surface geometry is made and digitized with a 3D‐scanner and used to numerically analyse the stress concentrations due to pitting corrosion. In this study, it was shown that the replica technique is able to reproduce the effective stress concentrations of the original surface with very high accuracy.

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The strain-life approach applied to welded joints: Considering the real weld geometry

Cited by 18 publications

References 12 publications

Nachweis der Ermüdungsfestigkeit mittels Kerbdehnungskonzept

Nachweis der Ermüdungsfestigkeit mittels Kerbdehnungskonzept

The Methacrylate Adhesive to Double-Lap Shear Joints Made of High-Strength Steel—Experimental Study

Fatigue stress concentrations analysis of real corroded steel structures based on replica imprints

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