PSI - Issue 31

Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2019) 000–000

www.elsevier.com/locate/procedia

ScienceDirect

Procedia Structural Integrity 31 (2021) 22–27

© 2021 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of ICSID 2020 Organizers. Abstract In this work, Design of Experiments is applied to identify which factors mostly influence the residual stress distribution in an hourglass specimen subject to the impact of a foreign object. The specimen is made of 7075-T6, that is one of the most popular alloys in the aeronautical sector. After the impact, the specimen is assumed to be tested with an axial or bending fatigue load. For this reason, the study is conducted on the axial stresses induced by the impact of the object on the specimen, assessed by means of finite element analysis. Only the stresses in the region x=[-2 mm; 2 mm], with x=0 corresponding to the position of the minimum cross section of the specimen before the impact, were considered. In this region, stress concentrations are probable during the fatigue test. The results showed that high impact forces induce high tensile stresses, unfavorable from a fatigue point of view. Therefore, it is preferable that the impacting object has a low weight and reduced speed. © 2021 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of ICSID 2020 Organizers. Keywords: FOD, Design of Experiments, Taguchi method, residual stresses, 7075-T6 1. Introduction Lightweight alloys are attractive to the aeronautical sector, because they allow the fabrication of components with high specific strength. The higher the specific strength, the higher the performance, as the reduced mass of the components means low inertia and consequently low fuel consumption. For this reason, the Authors’ research activity 4th International Conference on Structural Integrity and Durability, ICSID 2020 Application of Design of Experiments to Foreign Object Damage on 7075-T6 Emanuele Vincenzo Arcieri a , Sergio Baragetti a *, Željko Božić b a Department of Management, Information and Production Engineering, University of Bergamo, Viale Marconi 5, Dalmine 24044, Italy b Faculty of Mechanical Engineering and Naval Architecture, University of Zagreb, I. Lu č i ć a 5, Zagreb 10000, Croatia

* Corresponding author. Tel.: +39-035-205-2382; fax: +39-035-205-2221. E-mail address: sergio.baragetti@unibg.it

2452-3216 © 2021 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of ICSID 2020 Organizers.

2452-3216 © 2021 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of ICSID 2020 Organizers. 10.1016/j.prostr.2021.03.005