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  4. Festigkeit von Schweißverbindungen unter kombinierter Beanpruchung
 
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1996
Journal Article
Title

Festigkeit von Schweißverbindungen unter kombinierter Beanpruchung

Other Title
Fatigue behavior of welded joints under combined loading
Abstract
Welded crucifix-type specimens from fine grained steel StE 290 and flange-tube as well as tube-tube joints from fine grained steel StE 460 with unmachined and machined welds were investigated under biaxial constant amplitude loading in the range of 10(exp 3) to 5 X 10(exp 6) Cycles to crack initiation and breakthrough, respectively. In order not to interfere with residual stresses they were relieved by a heat treatment. In-phase loading can be treated fairly well using the conventional hypotheses (von Mises or Tresca) on basis of nominal, structural or local strains or stresses. But the influence of out-of-phase loading on fatigue life is severely overestimated if conventional hypotheses are used. However, the introduced hypothesis of the effective equivalent stress leads to fairly well predictions. Herefore, the knowledge of local strains or stresses is necessary. They are determined by boundary-elemente analyses in dependency of weld geometry. This hypothesis considers the influence of out-of-phase loading by taking into account the interaction of local shear stresses acting in different surface planes of the material. Further, size effects resulting from weld geometry and loading mode were included.
Author(s)
Sonsino, C.M.  
Fraunhofer-Institut für Betriebsfestigkeit und Systemzuverlässigkeit LBF  
Journal
Maschinenmarkt. MM, das Industriemagazin  
Language
German
Fraunhofer-Institut für Betriebsfestigkeit und Systemzuverlässigkeit LBF  
Keyword(s)
  • displaced phase loading

  • Feinkornbaustahl

  • Festigkeit

  • fine grained structural steel

  • local stress strain approach

  • mehrachsige Beanspruchung

  • multiaxial loading

  • örtliches Spannungsdehnungskonzept

  • phasenverschobene Beanspruchung

  • reduced stress

  • Rohrverbindung

  • Schweißverbindung

  • Stahl

  • steel

  • strength

  • tube joint

  • Vergleichsspannung

  • welded joint

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