PSI - Issue 38

Available online at www.sciencedirect.com Structural Integrity Procedia 00 (2021) 000 – 000 tr t r l I t rit r i ( ) Available online at www.sciencedirect.com ScienceDirect il l li t . i i t.

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Procedia Structural Integrity 38 (2022) 362–371

FATIGUE DESIGN 2021, 9th Edition of the International Conference on Fatigue Design Towards A Better Understanding Of Mechanical Stress Applied By Passenger Vehicle Customers With Optimized Instrumentation And Relevant Data Post-Processing Methodologies Denis CHOJNACKI a *, Benoit DELATTRE b a STELLANTIS, Belchamp, 25420 France b STELLANTIS, Technical Center Vélizy, Route de Gisy, 78140 Vélizy-Villacoublay, France Abstract The various mechanical parts of a vehicle must be designed to ensure a target level of reliability compatible with safety objectives while limiting oversizing. This requires automobile manufacturers to implement the relevant methodological tools adapted to the component failure mechanisms. Several improvements have been made over the past 10 years on this topic, in particular with tools taking into account the local properties of materials and thus delivering local stresses and damage at any point of each part. These procedures require track measurements or virtual road load data representing the image that each manufacturer chooses to have of a given customer severity level. This arbitrary level of severity then makes it possible to express a target performance threshold of the component to guarantee objective reliability. The difficulty in these methods is to be able to capture the severity levels of customers all over the world, which is by definition very variable because depending on several inputs like the road geography and quality, the customer behavior and style. The objective of this paper is to share the state-of-the-art methodologies implemented by PSA Groupe (now Stellantis) to capture this information with the best efficiency and also to reduce its cost through a Big Data approach. Three main themes will be addressed: ○ Instrumentation strategy a b a I , l , e b I , i l t li , t i , li - ill l , i i l t i l t i t t t l l li ilit ti l it t j ti il li iti i i . i i t il t t i l t t l t t l i l t l t t t t il i . l i t t t t i t i , i ti l it t l t i i t t t l l ti t i l t li i l l t t i t t. i t t i t l l t ti t i t t t chooses to hav i t it l l. i it l l it t it i l t t t t l t t to guarantee objective reli ilit . i i lt i t t i t l t t t it l l t ll t l , i i i iti i l i l i t li t lit , t t i t l . j ti t i i t t t t t t t l i i l t t ll ti t t t i i ti it t t i i l t it t t i t . i t ill : t t ti t t

○ Sampling methodology to catch the reality of the customer's field ○ Objectification and classification of customer life situations li t l t t t lit t t ' i l j ti i ti l i i ti t li it ti

© 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 the scientific committee of the Fatigue Design 2021 Organizers © 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 the scientific committee of the Fatigue Design 2021 Organizers ELSEVIER B.V. i i ti l t li tt :// ti .org/licenses/ nc-nd/ . i w un i ilit t i ti i itt t ti i i t . li

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* Denis Chojnacki E-mail address: denis.chojnacki@stellantis.com - il : i . j i t ll ti .

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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 the scientific committee of the Fatigue Design 2021 Organizers i i rti l r t - - li ( tt :// r ti . r /li / - - / . ) r-r i r r i ilit f t i tifi itt f t ti i r i r

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 the scientific committee of the Fatigue Design 2021 Organizers 10.1016/j.prostr.2022.03.037