[ Extension anisotherme des critères pour la fatigue polycyclique isotherme ]
Volume 15, Issue 2, June 2015, Pages 236–241
Kévin M. Tsapi Tchoupou1, Bertin D. Soh Fotsing2, and Alexis Kuitche3
1 Department of Petroleum Engineering, National Higher Polytechnic Institute, University of Bamenda, P.O. Box 39 Bambili, Cameroon
2 Department of Mechanical Engineering, Bandjoun University Institute of Technology, University of Dschang, P.O. Box 134 Bandjoun, Cameroon
3 Département de Génie Electrique, Energétique et Automatique, Université de Ngaoundéré, ENSAI, Ngaoundéré, Cameroun
Original language: French
Copyright © 2015 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.
In many situations encountered in engineering practice, structures or structural elements are under thermomechanical cycles of loading. The use in this condition of traditional fatigue criteria in high cycle fatigue is no more advisable because on structures, these criteria are formulated for the prediction of the number of cycles for the nucleation of cracks in the isothermal situation. In this paper, we propose an extension of stress invariants based criteria, for the anisothermal high cycle fatigue. Our proposal is essentially based on the hypothesis of accommodation at macroscopic and microscopic levels. The simulation made from the fatigue strength of the proposed ansiothermal criterion reproduced qualitatively the expected results. The proposed modified criteria will enhance the account the account of the multiaxial and anisothermal character of thermomechanical loadings.
Author Keywords: thermomechanical fatigue, Crossland, fatigue limit, accommodation, fatigue strength.
Volume 15, Issue 2, June 2015, Pages 236–241
Kévin M. Tsapi Tchoupou1, Bertin D. Soh Fotsing2, and Alexis Kuitche3
1 Department of Petroleum Engineering, National Higher Polytechnic Institute, University of Bamenda, P.O. Box 39 Bambili, Cameroon
2 Department of Mechanical Engineering, Bandjoun University Institute of Technology, University of Dschang, P.O. Box 134 Bandjoun, Cameroon
3 Département de Génie Electrique, Energétique et Automatique, Université de Ngaoundéré, ENSAI, Ngaoundéré, Cameroun
Original language: French
Copyright © 2015 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
In many situations encountered in engineering practice, structures or structural elements are under thermomechanical cycles of loading. The use in this condition of traditional fatigue criteria in high cycle fatigue is no more advisable because on structures, these criteria are formulated for the prediction of the number of cycles for the nucleation of cracks in the isothermal situation. In this paper, we propose an extension of stress invariants based criteria, for the anisothermal high cycle fatigue. Our proposal is essentially based on the hypothesis of accommodation at macroscopic and microscopic levels. The simulation made from the fatigue strength of the proposed ansiothermal criterion reproduced qualitatively the expected results. The proposed modified criteria will enhance the account the account of the multiaxial and anisothermal character of thermomechanical loadings.
Author Keywords: thermomechanical fatigue, Crossland, fatigue limit, accommodation, fatigue strength.
Abstract: (french)
Dans beaucoup de situations couramment rencontrées en ingénierie, les structures ou éléments de structures sont soumis à des chargements thermomécaniques cycliques. L'utilisation dans ces conditions des critères traditionnels en fatigue polycyclique n'est plus indiqué, car ils sont formulés pour la prédiction sur structure de l'amorçage de fissure de fatigue dans le cas isotherme. Dans cet article, nous proposons une extension des critères de l'approche par invariants de contraintes pour la fatigue polycyclique anisotherme. La proposition est essentiellement fondée sur l'hypothèse d'adaptation aux échelles macroscopique et mésoscopique. Les simulations faites à partir de la fonction de fatigue du critère anisotherme proposé reproduisent qualitativement les résultats attendus. Les critères ainsi proposés permettront une prise en compte du caractère multiaxial et anisotherme des chargements thermomécaniques.
Author Keywords: fatigue thermomécanique, Crossland, limite d'endurance, adaptation, fonction de fatigue.
How to Cite this Article
Kévin M. Tsapi Tchoupou, Bertin D. Soh Fotsing, and Alexis Kuitche, “Anisothermal extension of criteria for isothermal high cycle fatigue,” International Journal of Innovation and Scientific Research, vol. 15, no. 2, pp. 236–241, June 2015.
