Fatigue crack growth and control of 14MnNbq welding plates used for bridges / Yan-Ping Liu in Journal of engineering mechanics, Vol. 138 N° 1 (Janvier 2012)  

Public ISBD [article]  inJournal of engineering mechanics > Vol. 138 N° 1 (Janvier 2012) . - pp.30-35 Titre : Fatigue crack growth and control of 14MnNbq welding plates used for bridges Type de document : texte imprimé Auteurs : Yan-Ping Liu, Auteur ; Chuan-Yao Chen, Auteur ; Guo-Qing Li, Auteur Année de publication : 2012 Article en page(s) : pp.30-35 Note générale : Mécanique appliquée Langues : Anglais (eng) Mots-clés : 14MnNbq steel Fatigue-crack growth behavior Fatigue threshold Surface crack Damage tolerance design Résumé : The fatigue-crack growth (FCG) behavior of 14MnNbq bridge steel was experimentally investigated in this paper. The fatigue-crack growth rate and threshold under different stress ratios ( R ) are given for 14MnNbq base metal (BM), heat affected zone (HAZ), and weld metal (WM), respectively. Using the test results, an approach to determine the fatigue-crack closure factor by threshold values is proposed and a uniform expression of fatigue crack growth rate including stress ratio R is presented. Furthermore, the prediction of surface-crack growth is presented and the results are compared with the test results obtained from surface-crack growth tests under tensile/bending loading. Finally, a damage tolerance design method based on the condition of no crack growth is proposed, and suggestions about the fatigue design technique and accuracy requirement of nondestructive testing are proposed. ISSN : 0733-9399 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29EM.1943-7889.0000295 [article] Fatigue crack growth and control of 14MnNbq welding plates used for bridges [texte imprimé] / Yan-Ping Liu, Auteur ; Chuan-Yao Chen, Auteur ; Guo-Qing Li, Auteur . - 2012 . - pp.30-35. Mécanique appliquée Langues : Anglais (eng) in Journal of engineering mechanics > Vol. 138 N° 1 (Janvier 2012) . - pp.30-35 Mots-clés : 14MnNbq steel Fatigue-crack growth behavior Fatigue threshold Surface crack Damage tolerance design Résumé : The fatigue-crack growth (FCG) behavior of 14MnNbq bridge steel was experimentally investigated in this paper. The fatigue-crack growth rate and threshold under different stress ratios ( R ) are given for 14MnNbq base metal (BM), heat affected zone (HAZ), and weld metal (WM), respectively. Using the test results, an approach to determine the fatigue-crack closure factor by threshold values is proposed and a uniform expression of fatigue crack growth rate including stress ratio R is presented. Furthermore, the prediction of surface-crack growth is presented and the results are compared with the test results obtained from surface-crack growth tests under tensile/bending loading. Finally, a damage tolerance design method based on the condition of no crack growth is proposed, and suggestions about the fatigue design technique and accuracy requirement of nondestructive testing are proposed. ISSN : 0733-9399 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29EM.1943-7889.0000295

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