PSI - Issue 38

ScienceDirect Structural Integrity Procedia 00 (2021) 000 – 000 Structural Integrity Procedia 00 (2021) 000 – 000 Available online at www.sciencedirect.com Available online at www.sciencedirect.com Sci nceDire t Available online at www.sciencedirect.com ScienceDirect

www.elsevier.com/locate/procedia www.elsevier.com/locate/procedia

Procedia Structural Integrity 38 (2022) 631–639

© 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 Abstract Fatigue testing of a Carbon Fiber Reinforced Polymer (CFRP) in tension-tension loading has been conducted. In-situ surface strain measurements were performed to examine the gradual elongation of the specimen as this relates to stiffness loss and fatigue damage. A methodology capturing the specimen at peak load has been developed, including an automated trigger mechanism that activates the camera at the desired cycle count. The material tested was a Unidirectional (UD) Non-Crimp Fabric (NCF) with carbon fibers and an epoxy matrix. The fatigue test results revealed a wide scatter in the mid-range of the high cycle fatigue region. By studying the strain in the early fatigue loading cycles and the stiffness loss over time, benchmark of the fatigue performance between different material samples could be carried out, explaining the scatter in the fatigue testing. It could be observed that the fatigue limit of the UD CFRP material in the fiber direction is in the magnitude of 80 % of the material ’s Ultimate Tensile Strength (UTS). © 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 Keywords: CFRP; Fatigue; Stiffness degradation; DIC FATIGUE DESIGN 2021, 9th Edition of the International Conference on Fatigue Design Fatigue and Damage Assessment of CFRP Material Using Digital Image Correlation Sara Eliasson a,b,c, *, Lars Johan Wenner Berg a,b,c , Per Wennhage b,c , Mathilda K. Hagnell b,c , Zuheir Barsoum c a Scania CV AB, Södertälje, Sweden b The Centre for ECO 2 Vehicle Design, SE-100 44 Stockholm, Sweden c KTH Royal Institute of Technology, The Department of Engineering Mechanics, SE-100 44 Stockholm, Sweden Abstract Fatigue testing of a Carbon Fiber Reinforced Polymer (CFRP) in tension-tension loading has been conducted. In-situ surface strain measurements were performed to examine the gradual elongation of the specimen as this relates to stiff e s loss nd fatigue d mage. A methodology capturing the specimen at peak load has b en developed, including an automated trigger mechanism that activat s the camera a the desired cycle count. The material test d was a Uni irectional (UD) Non-Crimp Fabric (NCF) with carbon fib r and n poxy matrix. The fatigue test results r veal d a wide scatter in the mid-range f the high cycle fatigue region. By studying the strain in the early fatigue loading cycles and the stiffness loss over time, benchmark of t e fatigu performance between different m ter al samples could be carried out, explaining th scatter in the fatigue testing. It could b observed that the fatigue limi of he UD CFRP material in th fiber direct on is in the mag itude of 80 % of the material ’s Ultimate Tensile Strength (UTS). © 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 u der re ponsibility of scientific committe of the Fatigu Design 2021 Organ z rs Keywords: CFRP; Fatigue; Stiffness degradation; DIC FATIGUE DESIGN 2021, 9th Edition of the International Conference on Fatigue Design Fatigue and Damage Assessment of CFRP Material Using Digital Image Correlation Sara Eliasson a,b,c, *, Lars Johan Wenner Berg a,b,c , Per Wennhage b,c , Mathilda K. Hagnell b,c , Zuheir Barsoum c a Scania CV AB, Södertälje, Sweden b The Centre for ECO 2 Vehicle Design, SE-100 44 Stockholm, Sweden c KTH Royal Institute of Technology, The Department of Engineering Mechanics, SE-100 44 Stockholm, Sweden

* Corresponding author. Tel.: +46-8-553-54037. E-mail address: saraeli@kth.se * Corresponding author. Tel.: +46-8-553-54037. E-mail address: saraeli@kth.se

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 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

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.2022.04.065