[ Influence des contraintes résiduelles sur la durée de vie des structures en acier sous chargement d’amplitude variables ]
Volume 39, Issue 2, April 2023, Pages 667–675
Djonglibet Wel-Doret1, Tikri Bianzeube2, Dougabka Dao3, and Samson Mbairangone4
1 Laboratory of Study and Research in Industrial Technology, Faculty of Applied Sciences, University of N’Djamena, N’Djamena, Chad
2 Laboratoire de Résistance des Matériaux et Construction Mécanique, LRMCM, Université Polytechnique de Mongo, P.O. Box 4377, Mongo, Chad
3 Laboratoire de Résistance des Matériaux et Construction Mécanique, LRMCM, Université Polytechnique de Mongo, P.O. Box 4377, Mongo, Chad
4 Laboratoire de Résistance des Matériaux et Construction Mécanique, LRMCM, Université Polytechnique de Mongo, P.O. Box 4377, Mongo, Chad
Original language: French
Copyright © 2023 ISSR Journals. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
This paper focuses on the improvement of the nonlinear fatigue law of B. Tikri from 2011, which was born from the old laws of Chaboche according to the Basquin model. Several parameters can influence the life of structures in service. It is a question in this work to take into account the influence of the residual stress on the damage law proposed in the literature. Two values of stress relaxation coefficients of 0.5 and 1 have been considered to test the proposed model with two different overload ratios in order to evaluate the influence of overload on steels used in the automotive industry. The ratios were 1.4 and 2.3. Two findings were made, the first is that when the relaxation coefficient is 0.5 the residual stress improves the life but it is far from the experimental case contrary to the case of relaxation coefficient equal to the unit. For the second case, the model is much more satisfactory for overloads of ratio 1.4 than for overloads of ratio 2.3 for HE360D materials. For future designs, the consideration of its residual stresses over the life of parts or structures in service is paramount.
Author Keywords: Damage, stress, lifetime, Overload, relaxation coefficient.
Volume 39, Issue 2, April 2023, Pages 667–675
Djonglibet Wel-Doret1, Tikri Bianzeube2, Dougabka Dao3, and Samson Mbairangone4
1 Laboratory of Study and Research in Industrial Technology, Faculty of Applied Sciences, University of N’Djamena, N’Djamena, Chad
2 Laboratoire de Résistance des Matériaux et Construction Mécanique, LRMCM, Université Polytechnique de Mongo, P.O. Box 4377, Mongo, Chad
3 Laboratoire de Résistance des Matériaux et Construction Mécanique, LRMCM, Université Polytechnique de Mongo, P.O. Box 4377, Mongo, Chad
4 Laboratoire de Résistance des Matériaux et Construction Mécanique, LRMCM, Université Polytechnique de Mongo, P.O. Box 4377, Mongo, Chad
Original language: French
Copyright © 2023 ISSR Journals. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract
This paper focuses on the improvement of the nonlinear fatigue law of B. Tikri from 2011, which was born from the old laws of Chaboche according to the Basquin model. Several parameters can influence the life of structures in service. It is a question in this work to take into account the influence of the residual stress on the damage law proposed in the literature. Two values of stress relaxation coefficients of 0.5 and 1 have been considered to test the proposed model with two different overload ratios in order to evaluate the influence of overload on steels used in the automotive industry. The ratios were 1.4 and 2.3. Two findings were made, the first is that when the relaxation coefficient is 0.5 the residual stress improves the life but it is far from the experimental case contrary to the case of relaxation coefficient equal to the unit. For the second case, the model is much more satisfactory for overloads of ratio 1.4 than for overloads of ratio 2.3 for HE360D materials. For future designs, the consideration of its residual stresses over the life of parts or structures in service is paramount.
Author Keywords: Damage, stress, lifetime, Overload, relaxation coefficient.
Abstract: (french)
Cet article se penche sur l’amélioration de la loi non linéaire par fatigue de B. Tikri de 2011, qui est née des lois anciennes de Chaboche selon le modèle de Basquin. Plusieurs paramètres peuvent influencés la durée de vie des structures en service. Il est question dans ce travail de prendre en compte l’influence de la contrainte résiduelle sur la loi d’endommagement proposée dans la littérature. Deux valeurs de coefficients de relaxation de contrainte de 0,5 et 1 ont été considéré pour tester le modèle proposé avec deux rapports de surcharges différents afin d’évaluer l’influence de surcharge sur les aciers utilisés dans l’automobile. Il s’agit de rapport de 1,4 et de 2,3. Deux constats ont été fait dont le premier est que lorsque le coefficient de relaxation vaut 0.5 la contrainte résiduelle améliore la durée de vie mais elle s’éloigne de l’expérimentale contrairement pour le cas de coefficient de relaxation égale à l’unité. Pour le second cas, le modèle est beaucoup plus satisfaisant pour de surcharges de rapport 1,4 que pour des surcharges de rapport 2,3 pour les matériaux HE360D. Pour des conception avenir, la prise en compte de ses contraintes résiduelles sur la durée de vie pièces ou structures en service est primordiale.
Author Keywords: endommagement, contrainte, durée de vie, surcharge, coefficient de relaxation.
How to Cite this Article
Djonglibet Wel-Doret, Tikri Bianzeube, Dougabka Dao, and Samson Mbairangone, “Influence of residual stresses on the service life of structures under variable amplitude loading,” International Journal of Innovation and Applied Studies, vol. 39, no. 2, pp. 667–675, April 2023.
