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      저자 : Mehdi Ahmadi Najafabadi (검색결과 1 건)
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        Investigation of Mechanical Properties and Failure Behavior of CFRP Filament-Wound Composites Using an Acoustic Emission-Based Methodology and Numerical Simulation

        Sajad Alimirzaei,Mehdi Ahmadi Najafabadi,Ali Nikbakht 한국섬유공학회 2023 Fibers and polymers Vol.24 No.2

        Filament wound composites have a continuous structure, and to improve the mechanical behavior of these structures, it isnecessary to identify the damage mechanisms. The focus of this study is to investigate the mechanical properties and failureanalyses of filament-wound carbon/epoxy composite samples under three-point bending using the acoustic emission technique. To investigate this, first, using a filament winding machine, composite plates and composite structures with a squarecross section were fabricated. Afterward, composite specimens were tested and most independent elastic constants, strengthproperties, and shear properties were obtained. Then, a three-point bending testing of filament-wound composite specimenswas performed, and to identify the damage mechanisms the analysis of acoustic emission signals recorded during loadingwas also implemented. The acoustic emission signals of composite samples were classified using hierarchical and wavelettransform methods and the evolution of different damage mechanisms was investigated. Eventually, composite samples weresimulated in ABAQUS software, and to consider the damage mechanisms, the continuum damage mechanics model wasconsidered as a user material subroutine in simulation. The experimental results showed that the received acoustic emissionsignals matched very well with the mechanical behavior, and the acoustic response of the composite samples to the loadingincludes three regions. The amplitude range of the first, second, and third clusters was obtained between 35–74, 51–100, and55–84 dB, respectively. Finally, in the clustering method, the frequency range of fiber/matrix debonding and fiber breakagewere characterized between 200 and 250 and over 380 kHz, respectively.

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