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Dwell-fatigue behavior of a near α Ti 6242 alloy

  • P. Lefranc
  • , C. Sarrazin-Baudoux
  • , M. Gerland
  • , V. Doquet
  • , J. Petit
  • LMPM-ENSMA UMR 6617 CNRS
  • Department of Mechanics École Polytechnique

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Résumé

For over three decades, aeroengine manufacturers are confronted to the phenomenon of room temperature dwell-effect consisting in a decrease in structure life due to the introduction of hold periods at the maximum stress of the pure cyclic loading waveform. Even if many studies have been conducted to analyze the parameters responsible of this life decrease the so called "dwell effect" remains not completely understood. The present paper focused on damage occurring during pure cyclic, dwell fatigue and creep tests on a β-forged Ti-6242 alloy. It results from SEM and TEM analysis that crack initiation occurs by coalescence of shear-induced cavities nucleated at α/β interfaces in large colonies of α laths nearly parallel to the loading axis. The density and average size of cavities were larger in dwell-fatigue and creep than in fatigue.

langue originaleAnglais
titre17th European Conference on Fracture 2008
Sous-titreMultilevel Approach to Fracture of Materials, Components and Structures
Pages906-913
Nombre de pages8
étatPublié - 1 déc. 2008
Modification externeOui
Evénement17th European Conference on Fracture 2008: Multilevel Approach to Fracture of Materials, Components and Structures, ECF17 - Brno, République tchcque
Durée: 2 sept. 20085 sept. 2008

Série de publications

Nom17th European Conference on Fracture 2008: Multilevel Approach to Fracture of Materials, Components and Structures
Volume2

Une conférence

Une conférence17th European Conference on Fracture 2008: Multilevel Approach to Fracture of Materials, Components and Structures, ECF17
Pays/TerritoireRépublique tchcque
La villeBrno
période2/09/085/09/08

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