PSI - Issue 61

ScienceDirect Structural Integrity Procedia 00 (2023) 000 – 000 Structural Integrity Procedia 00 (2023) 000 – 000 Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceDirect Available online at www.sciencedirect.com ScienceDirect

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

Procedia Structural Integrity 61 (2024) 241–251

© 2024 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 IWPDF 2023 Chairman Abstract The damage to marine propeller blades is usually caused by an impact on a foreign object, erosion from cavitation, or impurity of the material. The impact of the marine propeller with foreign objects in the water causes small chips on the edge of the blade that are often unnoticed by the user of the boat. This leading edge damage, if not detected and treated, can lead to fatigue cracks. This study focuses on the detection of this structural defect by the comparison of the modal parameters and dynamic response for the healthy and damaged propeller blades. A 3D model of a marine propeller was developed on mechanical design software. To model the defect, an empty gap near the leading edge was created in «V» or «I» shapes with well-defined sizes. A modal and dynamic analysis was performed on Ansys Workbench for a propeller modeled by a single blade for healthy and damaged configurations. The effect of the size, position, and shape of the defects on the modal parameters of the helix was analyzed and discussed for the case of rotating and non-rotating blades. Then, the influence of this lack of impact on the dynamic response of the blade was analyzed by comparing the dynamic response for the healthy and damaged blades. This can be used as a defect detection procedure in marine propellers in service indicating the position and the severity of the defect. © 2024 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) 3rd International Workshop on Plasticity, Damage and Fracture of Engineering Materials (IWPDF 2023) Damage detection in marine propeller in service Rachid Azzi, Farid Asma* Mechanical Engineering Department, Mouloud MAMMERI University of Tizi-Ouzou, Algeria Abstract The damage to marine propeller blades is usually caused by an impact on a foreign object, erosion from cavitation, or impurity of the material. The impact of the marine propeller with foreign objects in the water causes small chips on the edge of the blade that are often unnoticed by the user of the boat. This leading edge damage, if not detected and treated, can lead to fatigue cracks. This study focuses on the detection of this structural defect by the comparison of the modal parameters and dynamic response for the healthy and damaged propeller blades. A 3D model of a marine propeller was developed on mechanical design software. To model the defect, an empty gap near the leading edge was created in «V» or «I» shapes with well-defined sizes. A modal and dynamic analysis was performed on Ansys Workbench for a propeller modeled by a single blade for healthy and damaged configurations. The effect of the size, position, and shape of the defects on the modal parameters of the helix was analyzed and discussed for the case of rotating and non-rotating blades. Then, the influence of this lack of impact on the dynamic response of the blade was analyzed by comparing the dynamic response for the healthy and damaged blades. This can be used as a defect detection procedure in marine propellers in service indicating the position and the severity of the defect. © 2024 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 IWPDF 2023 Keywords: Marine Propeller, Impact defect, Finite Element Modelisation, Damage detection; 1. Introduction Accidents due to propeller blade failures were almost non-existent until around 1974, but ten years later, they have grown in frequency (Ino and Tatara (1984)). Failure of marine propeller blades, not only affects propellers of long 3rd International Workshop on Plasticity, Damage and Fracture of Engineering Materials (IWPDF 2023) Damage detection in marine propeller in service Rachid Azzi, Farid Asma* Mechanical Engineering Department, Mouloud MAMMERI University of Tizi-Ouzou, Algeria Peer-review under responsibility of the scientific committee of IWPDF 2023 Keywords: Marine Propeller, Impact defect, Finite Element Modelisation, Damage detection; 1. Introduction Accidents due to propeller blade failures were almost non-existent until around 1974, but ten years later, they have grown in frequency (Ino and Tatara (1984)). Failure of marine propeller blades, not only affects propellers of long

* Corresponding author. Tel.: +213 771532720 E-mail address: asma-farid@ummto.dz * Corresponding author. Tel.: +213 771532720 E-mail address: asma-farid@ummto.dz

2452-3216 © 2024 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 IWPDF 2023 2452-3216 © 2024 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 IWPDF 2023

2452-3216 © 2024 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 IWPDF 2023 Chairman 10.1016/j.prostr.2024.06.031