PSI - Issue 66

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

www.elsevier.com/locate/procedia

ScienceDirect

Procedia Structural Integrity 66 (2024) 108–121

8th International Conference on Crack Paths Application of digital image correlation to identify crack locations during bending of composite samples of various dimensions Karolina G ł owacka a *, Tadeusz Smolnicki b a Faculty of Mechanical Engineering, Opole University of Technology, St. Miko ł ajczyka 5, Opole, Poland b Faculty of Mechanical Engineering, Wroc ł aw University of Science and Technology, Ł ukasiewicza 5/7, Wroc ł aw, Poland Abstract A bending test was carried out on polypropylene reinforced with continuous glass fibers. Samples of different dimensions were tested, and as a result, different ratios of the maximum normal to shear stress values were obtained - 6, 8, 16, 24, 60. Consequently, the samples cracked differently - there were translaminar and interlaminar fractures and situations in which trans- and interlaminar fractures co-occurred. The observations focused on two aspects of the destruction. Using digital image correlation, the location of the beginning of the crack of the tested material, which in many cases was not visible to the unarmed eye, was identified, as well as the type of fracture. The second topic of the observations was the analysis of the material's behavior while the load was continued. © 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: GFRP; Composite materials; DIC; Fracture 1. Introduction Composite materials are materials consisting of at least two component materials, creating a light and strong structure. Due to their strength properties, they are becoming increasingly popular in the industry, which is why they are also the subject of analysis by many scientists. The best strength effect is achieved when reinforced with continuous fibers in a direction consistent with the direction of fiber alignment. Usually, to ensure improvement of © 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: k.glowacka@po.edu.pl

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 10.1016/j.prostr.2024.11.060