PSI - Issue 19

Available online at www.sciencedirect.com Structural Integrity Procedia 116 (2019) 000 – 000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 116 (2019) 000 – 000 Available online at www.sciencedirect.com ScienceDirect

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ScienceDirect

Procedia Structural Integrity 19 (2019) 81–89

Fatigue Design 2019 Development of fatigue testing procedure for unidirectional carbon fiber composites Sara Eliasson a,b, *, Svenja Wanner a,b , Zuheir Barsoum a , Per Wennhage a a KTH - Royal Institute of Technology, Centre for ECO2 Vehicle Design, Teknikringen 8, 100 44 Stockholm, Sweden b Scania CV AB, Södertälje, Sweden Fatigue Design 2019 Development of fatigue testing procedure for unidirectional carbon fiber composites Sara Eliasson a,b, *, Svenja Wanner a,b , Zuheir Barsoum a , Per Wennhage a a KTH - Royal Institute of Technology, Centre for ECO2 Vehicle D sign, Teknikringen 8, 100 44 Stockholm, Sweden b Scania CV AB, Södertälje, Sweden There is an increase in the use of fiber reinforced polymer materials in the vehicle industry due to th e material’s significance in designing lightweight vehicle structures and components. For these structures and components structural mechanical properties are important to characterize, particularly the fatigue properties. An approach on setting up a systematical fatigue testing procedure to find an optimal specimen design for the provided lab environment is proposed. It is found that the tab configuration and tab material have a large impact on the test results. The proposed test procedure results in fatigue failure of the CFRP material rather than tab failure. The final method has resulted in successfully testing parallel-side-coupon specimens under tension-tension fatigue testing, with a load ratio of 0.1 and with a frequency of 5 Hz. There is an increase in t e use of fiber reinforced polymer mat rials in the vehicle industry due to th e aterial’s significance in designing lightweight vehicle structures and components. For these stru tures and com onents structural mechanical properties are important to characterize, particularly the fatigue properties. An approach on setting p a systematical fatigue testing procedure to find an optimal specimen design for the provided lab environment is proposed. It is found that the tab configur tion and tab m terial have a large impact on the test results. The proposed test procedure results in fatigu failure of the CFRP material r ther than tab failure. The final method has resulted in successfully testing parallel-side-coupon specimens under tension-tension fatigue testing, with a load ratio of 0.1 and with a frequency of 5 Hz. 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: Unidirectional; Carbon fiber reinforced polymer; Fatigue; Testing Keywords: Unidirectional; Carbon fiber reinforced polymer; Fatigue; Testing

1. Introduction 1. Introduction

Fiber reinforced polymers are becoming more important for lightweight vehicle components. The reliability, durability and structural performance of these new material systems can be evaluated through physical testing and simulations. For composite materials in commercial vehicles, a wide variety of service loads, cyclic loading and road induced vibrations often sets the design and dimensioning criteria for components. In the last decades there has been Fiber reinforced polymers are becoming more i portant for lightweight vehicle components. The reliability, durability and structural performance of these new material systems can be evaluated through physical testing and simulations. For composite materials in commercial vehicles, a wide variety of service loads, cyclic loading and road induced vibrations often sets the design and dimensioning criteria for components. In the last decades there has been

* Corresponding author. Tel.: +468 553 54037 E-mail address: saraeli@kth.se * Correspon ing author. Tel.: +468 553 54037 E-mail address: saraeli@kth.se

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.

2452-3216 © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Fatigue Design 2019 Organizers. 10.1016/j.prostr.2019.12.010