PSI - Issue 19

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

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ScienceDirect

Procedia Structural Integrity 19 (2019) 585–594

Fatigue Design 2019 Improvement of the fatigue strength of welds for lightweight chassis application made of Advanced High Strength Steels M. Duchet a , J. Haouas a , E.Gibeau b , F. Pechenot a , C. Honecker a , R. Munier a *, B. Weber a a ArcelorMittal Global R&D, Maizières-Lès-Metz, France b ArcelorMitta Global R&D, Montataire, France Fatigue Design 2019 Improvement of the fatigue strength of welds for lightweight chassis application made of Advanced High Strength Steels M. Duchet a , J. Haouas a , E.Gibeau b , F. Pechenot a , C. Honecker a , R. Munier a *, B. Weber a a ArcelorMittal Global R&D, Maizières-Lès-Metz, France b ArcelorMitta Global R&D, Montataire, France The objective of this development is to promote the application of Advanced High Strength Steel grades for mass saving of chassis parts consisting in replacing current steel grades by thinner gauge ones having higher mechanical properties. In this context, the fatigue strength of Gaz Metal Arc Welds could become an issue. Therefore, solutions to improve the fatigue strength of welds were investigated on GMAW lap specimens. Then several demonstrators, representative of typical joint geometries, were proposed to validate post-treatments according to different modes of loading and provide realistic and demonstrative evaluations. Today, the improvement in fatigue resistance according to the type of post-treatment/reinforcement applied can be quantified as well as the cost of such solutions. Examples of weight saving are proposed and quoted based on steel chassis part solution. The objective of this development is to promote the application of Advanced Hig Strength Steel grades for mass saving of chassis parts consisting in replacing current steel gra es by thin er gauge ones having higher mechanical properties. In t is context, th fatigue strength of Gaz Metal Arc Welds could become an issue. Therefore, solutions to improve the fatigu strength of welds were investigated on GMAW lap specimens. Th several demonstrators, repres ntative of typical joint geometries, were proposed to validate post-treatments according to different modes of loading and provide r listic and demonstrative evaluations. Today, t impr vement in fatigue resistance according to the ty e of post-treatment/reinforcement applied c n be qua tified as well as the cost of such solutions. Examples of weight saving are proposed and quoted based on steel chassis part solution. Abstract Abstract

© 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Fatigue Design 2019 Organizers. © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Fatigue Design 2019 Organizers. © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Fatigue Design 2019 Organizers. Keywords: Fatigue strength; Advanced High Strength Steels; Gaz Metal Arc Welds; Mass saving Keywords: Fatigue strength; Advanced High Strength Steels; Gaz Metal Arc Welds; Mass saving

1. Introduction 1. Introduction

S-in motion® [1] is a set of steel solutions developed by ArcelorMittal for the automotive market. One steel solution focuses on chassis parts of vehicle and promotes the use of Advanced High Strength Steel (Tensile Strength at 800 MPa and higher [2]). The objective is to propose to carmakers solutions to reach lighter and safer vehicles at the most affordable cost. One of the main practices used by automotive OEMs (Original Equipment Manufacturers) to save S-in motion® [1] is a set of steel solutions developed by ArcelorMittal for the automotive market. One steel solution focuses on chassis parts of vehicle and promotes the use of Advanced High Strength Steel (Tensile Strength at 800 MPa and higher [2]). The objective is to propose to carmakers solutions to reach lighter and safer vehicles at the most affordable cost. One of the main practices used by automotive OEMs (Original Equipment Manufacturers) to save

2452-3216 © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Fatigue Design 2019 Organizers. 2452-3216 © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Fatigue Design 2019 Organizers. * Correspon ing author. Tel.: +33 (0)3 87 70 48 17; fax: +33 (0)3 87 70 47 14. E-mail address: remi.munier@arcelormittal.com * Corresponding author. Tel.: +33 (0)3 87 70 48 17; fax: +33 (0)3 87 70 47 14. E-mail address: remi.munier@arcelormittal.com

2452-3216 © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Fatigue Design 2019 Organizers. 10.1016/j.prostr.2019.12.063