PSI - Issue 52

ScienceDirect Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2022) 000 – 000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2022) 000 – 000 Available online at www.sciencedirect.com Procedia Structural Integrity 52 (2024) 252–258

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2452-3216 © 2023 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 Professor Ferri Aliabadi 10.1016/j.prostr.2023.12.026 2452-3216 © 2023 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 Professor Ferri Aliabadi 2452-3216 © 2023 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 Professor Ferri Aliabadi © 2023 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 Professor Ferri Aliabadi Abstract A study was conducted on the change in mechanical properties due to void, one of the fabrication defects of composite materials for wind turbine blades. The study was conducted based on glass fiber fabric, which is mainly applied to wind turbine blades, and the material properties were predicted by simulating random defects with micro and meso modeling of the composite material with void. The basic properties due to void were predicted through the homogenization method, and the failure properties were obtained through progressive failure analysis by applying virtual coupons according to ASTM D3090 and ASTM D6641. The currently widely used Mori-Tanaka method was used for mean field homogenization, the Hashin theory was used for failure conditions, and 1. Introduction Due to energy crisis, the OOA (Out of Autoclave) composites manufacturing process comes to the fore, and there is a growing interest in understanding the defects that occur in manufacturing composites by the OOA manufacturing method. In particular, voids are typical manufacturing defects that occur during the LCM (liquid composite moulding) process which is one of the OOA processes. They result from a variety of causes such as mechanical air entrainment, gases generated by chemical reactions during hardening, and gases dissolved in resins. The voids of fiber reinforced composites (FRC) are formed as micro-voids between fibers of TOW. They are formed as meso-voids between TOW. In the greater area of preform, they are formed as macro-voids. The formation of micro- Abstract A study was conducted on the change in mechanical properties due to void, one of the fabrication defects of composite materials for wind turbine blades. The study was conducted based on glass fiber fabric, which is mainly applied to wind turbine blades, and the material properties were predicted by simulating random defects with micro and meso modeling of the composite material with void. The basic properties due to void were predicted through the homogenization method, and the failure properties were obtained through progressive failure analysis by applying virtual coupons according to ASTM D3090 and ASTM D6641. The currently widely used Mori-Tanaka method was used for mean field homogenization, the Hashin theory was used for failure conditions, and the Matzenmiller-Lubliner-Taylor method was used for progressive failure. Keywords: Void, Homogenization, Multiscale analysis, hanshin failure, laminate strength 1. Introduction Due to energy crisis, the OOA (Out of Autoclave) composites manufacturing process comes to the fore, and there is a growing interest in understanding the defects that occur in manufacturing composites by the OOA manufacturing method. In particular, voids are typical manufacturing defects that occur during the LCM (liquid composite moulding) process which is one of the OOA processes. They result from a variety of causes such as mechanical air entrainment, gases generated by chemical reactions during hardening, and gases dissolved in resins. The voids of fiber reinforced composites (FRC) are formed as micro-voids between fibers of TOW. They are formed as meso-voids between TOW. In the greater area of preform, they are formed as macro-voids. The formation of micro- Fracture, Damage and Structural Health Monitoring Damage Modelling and Analysis of Composite Blade for Wind Turbine Haseung Lee a , Hyunbum Park a, * a Department of Mechanical Engineering, Kunsan National University, Daehak-ro 558, Gunsan 54150, Rep. of Korea Fracture, Damage and Structural Health Monitoring Damage Modelling and Analysis of Composite Blade for Wind Turbine Haseung Lee a , Hyunbum Park a, * a Department of Mechanical Engineering, Kunsan National University, Daehak-ro 558, Gunsan 54150, Rep. of Korea the Matzenmiller-Lubliner-Taylor method was used for progressive failure. Keywords: Void, Homogenization, Multiscale analysis, hanshin failure, laminate strength * Corresponding author. Tel.: +0-000-000-0000 ; fax: +0-000-000-0000 . E-mail address: gamamle@inu.ac.kr * Corresponding author. Tel.: +0-000-000-0000 ; fax: +0-000-000-0000 . E-mail address: gamamle@inu.ac.kr