PSI - Issue 18

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

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ScienceDirect

Procedia Structural Integrity 18 (2019) 255–261

25th International Conference on Fracture and Structural Integrity Experimental fatigue curves to perform the fatigue assessment of aluminium-to-steel thin welded joints Ibrahim Al Zamzami, Buick Davison and Luca Susmel* Department of Civil and Structural Engineering, The University of Sheffield, Mappin Street, Sheffield S1 3JD, United Kingdom Abstract Welding of different materials, especially aluminium alloys to steel, has always been a challenge because of the significant differences in their mechanical, thermo-physical and metallurgical properties that result in the formation of hard and brittle intermetallic phases in the welding region. In this context, this paper experimentally investigates the fatigue behaviour of aluminium-to-steel thin welded joints. The purpose of this investigation is to verify the accuracy of the nominal stress approach in estimating the fatigue life of aluminium-to-steel welded joints. EWM coldArc® welding technology was used to make the welded samples used for this validation exercise. The results of this experimental/theoretical study show that the nominal stress approach can be used to evaluate the fatigue of thin aluminium-to-steel welded joints, provided that the appropriate reference/calibration fatigue curves are used. 25th International Conference on Fracture and Structural Integrity Experimental fatigue curves to perform the fatigue assessment of aluminium-to-steel thin welded joints Ibrahim Al Zamzami, Buick Davison and Luca Susmel* Department of Civil and Structural Engineering, The University of Sheffield, Mappin Street, Sheffield S1 3JD, United Kingdom Abstract Welding of different materials, especially aluminium alloys to steel, has always been a challenge because of the significant differences in their mechanical, thermo-physical and metallurgical properties that result in the formation of hard and brittle intermetallic phases in the welding region. In this context, this paper experimentally investigates the fatigue behaviour of aluminium-to-steel thin welded joints. The purpose of this investigation is to verify the accuracy of the nominal stress approach in estimating the fatigue life of aluminium-to-steel welded joints. EWM coldArc® welding technology was used to make the welded samples used for this validation exercise. The results of this experimental/theoretical study show that the nominal stress approach can be used to evaluate the fatigue of thin aluminium-to-steel welded joints, provided that the appropriate reference/calibration fatigue curves are used.

© 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Gruppo Italiano Frattura (IGF) ExCo. © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Gruppo Italiano Frattura (IGF) ExCo. © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Gruppo Italiano Frattura (IGF) ExCo.

Keywords: Aluminium-to-steel welds; nominal stresses; hybrid joints Keywords: Aluminium-to-steel welds; nominal stresses; hybrid joints

1. Introduction The assembly of aluminium to steel is a subject of great interest due to the desirable properties of each metal. Traditionally, the methods of joining these reliable and common materials require the use of mechanical fasteners (Schijve 2012). However, this is considered a relatively expensive means of connection due to the cost of associated labour, especially when large quantities are required. 1. Introduction The assembly of aluminium to steel is a subject of great interest due to the desirable properties of each metal. Traditionally, the methods of joining these reliable and common aterials require the use of mechanical fasteners (Schijve 2012). However, this is considered a relatively expensive means of connection due to the cost of associated labour, especially when large quantities are required.

2452-3216 © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Gruppo Italiano Frattura (IGF) ExCo. 2452-3216 © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Gruppo Italiano Frattura (IGF) ExCo. * Correspon ing author. Tel.:+44(0)1142225073; fax: +44(0)1142225700. E-mail address: l.susmel@sheffield.ac.uk * Corresponding author. Tel.:+44(0)1142225073; fax: +44(0)1142225700. E-mail address: l.susmel@sheffield.ac.uk

2452-3216  2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Gruppo Italiano Frattura (IGF) ExCo. 10.1016/j.prostr.2019.08.161