| Titre : | Fatigue crack growth and control of 14MnNbq welding plates used for bridges (2012) |
| Auteurs : | Yan-Ping Liu, Auteur ; Chuan-Yao Chen, Auteur ; Guo-Qing Li, Auteur |
| Type de document : | Article : texte imprimé |
| Dans : | Journal of engineering mechanics (Vol. 138 N° 1, Janvier 2012) |
| Article en page(s) : | pp.30-35 |
| Note générale : | Mécanique appliquée |
| Langues : | Anglais |
| Tags : | 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 |
