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Fatigue threshold R-curves predict small crack fatigue behavior of bridging toughened materials / S. Gallops in Acta materialia, Vol. 59 N° 20 (Décembre 2011) 

Public ISBD [article]  in Acta materialia > Vol. 59 N° 20 (Décembre 2011) . - pp. 7654–7661 Titre : Fatigue threshold R-curves predict small crack fatigue behavior of bridging toughened materials Type de document : texte imprimé Auteurs : S. Gallops, Auteur ; T. Fett, Auteur ; J. W. Ager III, Auteur Année de publication : 2012 Article en page(s) : pp. 7654–7661 Note générale : Métallurgie Langues : Anglais (eng) Mots-clés : Fatigue  Fracture  Toughness  Crack  bridging Résumé : Small crack fatigue is a widely recognized problem in the fatigue of materials; however, there has been limited progress in developing methods to predict small crack fatigue behavior. In this paper small crack effects due to crack bridging are addressed. A fatigue threshold R-curve was measured for a 99.5% pure polycrystalline alumina using standard compact tension specimens and was used (i) to determine the bridging stress profile for the material and (ii) to make fatigue endurance strength predictions for realistic semi-elliptical surface cracks. Furthermore, it has been shown that the fatigue threshold R-curve can equivalently be determined by measuring the bridging stress distribution, in this case using fluorescence spectroscopy, using only a long crack compact tension specimen without the need for difficult small crack experiments. It is expected that this method will be applicable to a wide range of bridging toughened materials, including composites, toughened ceramics, intermetallics, and multi-phase materials. ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S135964541100615X [article] Fatigue threshold R-curves predict small crack fatigue behavior of bridging toughened materials [texte imprimé] / S. Gallops, Auteur ; T. Fett, Auteur ; J. W. Ager III, Auteur . - 2012 . - pp. 7654–7661. Métallurgie Langues : Anglais (eng) in Acta materialia > Vol. 59 N° 20 (Décembre 2011) . - pp. 7654–7661 Mots-clés : Fatigue  Fracture  Toughness  Crack  bridging Résumé : Small crack fatigue is a widely recognized problem in the fatigue of materials; however, there has been limited progress in developing methods to predict small crack fatigue behavior. In this paper small crack effects due to crack bridging are addressed. A fatigue threshold R-curve was measured for a 99.5% pure polycrystalline alumina using standard compact tension specimens and was used (i) to determine the bridging stress profile for the material and (ii) to make fatigue endurance strength predictions for realistic semi-elliptical surface cracks. Furthermore, it has been shown that the fatigue threshold R-curve can equivalently be determined by measuring the bridging stress distribution, in this case using fluorescence spectroscopy, using only a long crack compact tension specimen without the need for difficult small crack experiments. It is expected that this method will be applicable to a wide range of bridging toughened materials, including composites, toughened ceramics, intermetallics, and multi-phase materials. ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S135964541100615X