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Simple but Effective - a Mechanical Methode to Improve the Fatigue Behaviour of Spot Welded High-Strength Steels

  • Substantial improvement in the fatigue strength of spot welded high-strength steels has been achieved with the help of a mechanical method, i. e. preloading. Fatigue tests of preloaded tensile shear specimens made from the material H280LA have revealed that their S/N-curves, compared to those of non-preloaded specimens, are not only located at elevated positions, but have flatter slope, too. Low cycle fatigue tests of the triple-spot weld tensile shear specimens examined yielded an increase in fatigue strength of around 50 %. Due to preloading, the notch zones in the spot welded area undergo plastic deformation as a result of high notch stresses. After specimen unloading, compressive stresses arise in this area involving a beneficial specimen behaviour under the load imposed in subsequent fatigue testing, thus causing delayed crack initiation in the spot weld area.

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Metadaten
Autoren/innen:Ping Xu
Dokumenttyp:Vortrag
Veröffentlichungsform:Präsentation
Sprache:Englisch
Titel des übergeordneten Werkes (Englisch):The 3rd International Seminar on Advances in Resistance Welding
Jahr der Erstveröffentlichung:2004
Veranstaltung:The 3rd International Seminar on Advances in Resistance Welding
Veranstaltungsort:Berlin, Germany
Beginndatum der Veranstaltung:2004-11-16
Verfügbarkeit des Volltexts:Weder Volltext-PDF noch papiergebundenes Belegexemplar vorhanden ("No Access")
Datum der Freischaltung:19.02.2016
Referierte Publikation:Nein