Issue 51

K. Bahram et alii, Frattura ed Integrità Strutturale, 51 (2020) 467-476; DOI: 10.3221/IGF-ESIS.51.35 467 Simulation of the retardation effect after applying a simple overload on alloys of aluminum 2024T351 using the Willemborg model Kaddour Bahram University Centre of Ain Témouchent-Belhadj Bouchaib, Department of Mechanical Engineering, Po Box 284,46000, Algeria Laboratory of Materials and Reactive Systems LMSR, Department of Mechanical Engineering, University Djilali Liabes, BP 89, Cité Ben M’hidi, Sidi bel Abbes, 22000, Algeria Kadero_7@hotmail.com, https://orcid.org/0000-0002-8963-4936 Mohamed Chaib Smart Structures Laboratory (SSL) University Centre of Ain Témouchent-Belhadj Bouchaib, Po Box 284,46000, Algeria. pro19moh@hotmail.com ,https://orcid.org/0000-0002-0493-1764 Abdelkader Slimane, Benattou Bouchouicha Laboratory of Materials and Reactive Systems LMSR, Department of Mechanical Engineering, University Djilali Liabes, BP 89, Cité Ben M’hidi, Sidi bel Abbes, 22000, Algeria slimane.aek@hotmail.com, https://orcid.org/0000-0001-5183-7420 benattou_b@yahoo.fr ,https://orcid.org/0000-0002-6051-5108 A BSTRACT . The structures in service are subjected to loads whose amplitude varies most often over time. These differences in loading cycle levels will have a direct impact on the propagation of cracks that can lead to accelerations or slowdowns in the propagation speed of these cracks. Indeed, the delay of the propagation of a crack produced by the application of a simple overload depends on several parameters, such as the material, the loading, the geometry of the specimen and the environment. In this paper, study the influence of the loading parameters such as the load ratio, and the overload rate, on both crack propagation, propagation speed, number of delay cycle, is investigated by using the AFGROW code and the willenbourg model, which describes the delay after applying overloads. K EYWORDS . Aluminum alloys; 2024T351; Fatigue; Plastic zone; Simple overload; Willenbourg model. Citation: Bahram, K., Chaib, M., Slimane, A., Bouchouicha, B., Simulation of the retardation effect after applying a simple overload on alloys of aluminum 2024T351 using the Willemborg model, Frattura ed Integrità Strutturale, 51 (2020) 467-476. Received: 28.09.2019 Accepted: 11.12.2019 Published: 01.01.2020 Copyright: © 2020 This is an open access article under the terms of the CC-BY 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. I NTRODUCTION he prevention of breaks in service is an ongoing objective of designers, builders and users, in both energy sector (thermal power stations, alternators), oil sector (gas pipelines, pipelines),aeronautical sector ( cells), rail and road transport, public works (bridges, dams, piers), consumer goods (automobiles) [1-3]. T