Issue 50

A. Salmi et alii, Frattura ed Integrità Strutturale, 50 (2019) 231-241; DOI: 10.3221/IGF-ESIS.50.19 240 modelling and the possibility of predicting the initiation of fatigue damage in mechanical elements following a cyclic contact solicitation represent this contribution to the problems examined. - The qualitative effect of load ratio is to shift a growth rate curve along a line passing through the inflection points. The observation that this shift is not horizontal forms the basis for stress ratio modeling with the hyperbolic sine When the curve is completed. - The use of the appropriate mechanical behavior laws for the different phases of thermo-mechanical growth plays an important role in the mechanical results, in particular on the distribution of residual stresses in the structure. Thus, the increase in temperature leads to an increase in the equivalent stresses of Von-Mises, axial displacements and total deformation of the plates. - The Thermo-mechanical effect occurring at the conditions of the performed tensile , depends on the temperature and the direction of sampling concerning the plate rolling direction. The effect occurs even at such low temperature as 30°C and is most in-tense in the temperature range 50 - 60°C. - Von-Mises stresses and overall deformations and plate contact pressures increase significantly when the thermal and mechanical aspect is coupled. - The effect of temperature on crack propagation is presented, giving the best lifetime prediction. - The damage becomes more pronounced with higher temperature Finally, it is important to note that the "strong" coupling between temperature and mechanical variables (stress, strain, strain, and damage) is very important. Temperature considerations in plastic or visco-plastic models allow the behaviour of structures to be well represented without complex loads. Additional analyses should be conducted to assess the applicability and limitations of the methodology for studying cases in which significant behavior of plastic deformation is involved. A CKNOWLEDGEMENTS he authors are especially grateful for the support provided by the Laboratory (LMS). Department of Mechanical Engineering, Faculty of Technology, University Djillali Liabès of Sidi Bel-Abbes, Algeria and Research Unit in renewable energies in the desert center adrar, Algeria. R EFERENCES [1] Chapuliot, S. (2000). Formulaire de KI pour les tubes avec un défaut de surface semi-elliptique longitudinal ou circonférentiel, interne ou externe, Direction des Réacteurs Nucléaires. Rapport de recherche., CEA R-5900. [2] Dhondt, G. (1998). Cutting of a 3D finite element mesh for automatic mode I crack propagation calculations, International Journal for Numerical Methods in Engineering., 42, pp. 749-772. DOI: 10.1002/(SICI)1097-0207. [3] Jordan, T.M., Angel, P.A., Galya, V.D., Nikolaj, G., Kenan, F.S. and Vladimir, P.D. (2018). Impact of slide diamond burnishing additional parameters on fatigue behaviour of 2024 -T3 Al alloy, Fatigue Fract Eng Mater Struct., 42, pp. 1– 11. DOI:10.1111/ffe.12915. [4] KarakaŞ, Ö. and Szusta, J. (2016). Monotonic and low cycle fatigue behaviour of 2024-T3 aluminum alloy between room temperature and 300 °C for designing VAWT components, Fatigue Fract Engng Mater Struct., 39, pp. 95–109. DOI: 10.1111/ffe.12336. [5] Gowda, P., Prakash, K., Shivashankare Gowda, J.N., and Satish Babu, B. (2015). Effect of Particulate Reinforcement on the Mechanical Properties of Al2024-WC MMCs, Journal of Minerals and Materials Characterization and Engineering, 3, pp. 469-476. DOI: 10.4236/jmmce.2015.36049. [6] Zaki, M., Wahab, M., Sutarno and Wahyudi, S. (2015). Effects of Anodizing Parameters in Tartaric-Sulphuric Acid on Coating Thickness and Corrosion Resistance of Al 2024 T3 Alloy, Journal of Minerals and Materials Characterization and Engineering, 3, pp. 154-163. DOI: 10.4236/jmmce.2015.33018. [7] Manti, R., Dwivedi, D.K. and Agarwal, A. (2008). Pulse TIG welding of two Al-Mg-Si alloys, Journal of Materials Engineering and Performance, 17, pp. 667–673. DOI: 10.1007/s11665-008-9210-z. [8] Abdullah, S., Beden, S.M. and Ariffin, A.K. (2011). Fatigue crack growth simulation of aluminum alloy under cyclic sequence effects, In Tech Pub., 247. DOI: 10.5772/14898. [9] Guedri, A. (2008). Conception et simulation numérique des caractéristiques mécaniques des pipelines, Ph.D. thesis, université badji Mokhtar. Annaba. Algeria. T