PSI - Issue 66

ScienceDirect Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2025) 000–000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2025) 000–000 Available online at www.sciencedirect.com Procedia Structural Integrity 66 (2024) 26–37

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8th International Conference on Crack Paths Characterization of the fatigue crack growth behavior of fabric reinforced fiber-plastic composites under interlaminar shear and out-of-plane compressive loading Carl H. Wolf 1 *, Sebastian Henkel 1 , Christian Düreth², Maik Gude² and Horst Biermann 1 1 Institute of Materials Engineering, Technische Universität Bergakademie Freiberg 2 Institute for Lightweight Engineering and Polymer Technology, Technische Universität Dresden Abstract In this work, the crack growth behavior of carbon fiber fabric-reinforced plastic composites with a tensile force ratio of R =0.1 under (i) uniaxial and (ii) Mixed-Mode loading with constant compressive force was characterized, testing specimens with a hole notch geometry. The energy release rate under uniaxial loading was determined using FE analysis. For uniaxial and biaxial loading, the evaluation was also carried out using a modified digital image correlation method. The results were compared with literature data. 1. Introduction The use of modern high-performance materials in safety-relevant components requires the development of new testing and measuring methods to evaluate component safety and the determination of service life models. One example of such a material is carbon fiber fabric-reinforced plastic composites (FRP), which are used in the aviation industry, among others. A purely adhesive bonding process is not suitable for joining FRP components due to safety concerns; therefore, bolt-rivet joints are predominantly used for this application. For such a joint, holes are drilled into the FRP components, which damage the fabric. The subsequent force-fit connection leads to an out-of-plane compressive loading, which generates tensile stresses in the direction of the fabric, cf. Figure 1. These tensile stresses in the fabric 8th International Conference on Crack Paths Characterization of the fatigue crack growth behavior of fabric reinforced fiber-plastic composites under interlaminar shear and out-of-plane compressive loading Carl H. Wolf 1 *, Sebastian Henkel 1 , Christian Düreth², Maik Gude² and Horst Biermann 1 1 Institute of Materials Engineering, Technische Universität Bergakademie Freiberg 2 Institute for Lightweight Engineering and Polymer Technology, Technische Universität Dresden Abstract In this work, the crack growth behavior of carbon fiber fabric-reinforced plastic composites with a tensile force ratio of R =0.1 under (i) uniaxial and (ii) Mixed-Mode loading with constant compressive force was characterized, testing specimens with a hole notch geometry. The energy release rate under uniaxial loading was determined using FE analysis. For uniaxial and biaxial loading, the evaluation was also carried out using a modified digital image correlation method. The results were compared with literature data. Keywords: fabric-reinforced fiber-plastic composites; Mixed-Mode loading; cyclic fatigue crack growth; fatigue, DIC 1. Introduction The use of modern high-performance materials in safety-relevant components requires the development of new testing and measuring methods to evaluate component safety and the determination of service life models. One example of such a material is carbon fiber fabric-reinforced plastic composites (FRP), which are used in the aviation industry, among others. A purely adhesive bonding process is not suitable for joining FRP components due to safety concerns; therefore, bolt-rivet joints are predominantly used for this application. For such a joint, holes are drilled into the FRP components, which damage the fabric. The subsequent force-fit connection leads to an out-of-plane compressive loading, which generates tensile stresses in the direction of the fabric, cf. Figure 1. These tensile stresses in the fabric © 2025 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 CP 2024 Organizers Keywords: fabric-reinforced fiber-plastic composites; Mixed-Mode loading; cyclic fatigue crack growth; fatigue, DIC

* Corresponding author E-mail address: carl.wolf@tu-bergakademie.de

2452-3216 © 2025 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 CP 2024 Organizers 10.1016/j.prostr.2024.11.052 2452-3216 © 2025 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 CP 2024 Organizers 2452-3216 © 2025 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 CP 2024 Organizers * Corresponding author E-mail address: carl.wolf@tu-bergakademie.de