Mechanical Properties of Uncured Thermoset Tow Prepreg: Experiment and Finite Element Analysis
This paper presents an experimental analysis of the tensile behavior of unidirectional carbon/epoxy prepreg, focusing on the nonlinearity observed at the beginning of the stress–strain curve. Due to the material’s high viscosity, securely holding specimens during testing was challenging, prompting m...
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| Format: | Article |
| Language: | English |
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MDPI AG
2023-07-01
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| Series: | Journal of Composites Science |
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| Online Access: | https://www.mdpi.com/2504-477X/7/8/312 |
| _version_ | 1797584284184215552 |
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| author | Mina Derakhshani Dastjerdi Massimo Carboni Mehdi Hojjati |
| author_facet | Mina Derakhshani Dastjerdi Massimo Carboni Mehdi Hojjati |
| author_sort | Mina Derakhshani Dastjerdi |
| collection | DOAJ |
| description | This paper presents an experimental analysis of the tensile behavior of unidirectional carbon/epoxy prepreg, focusing on the nonlinearity observed at the beginning of the stress–strain curve. Due to the material’s high viscosity, securely holding specimens during testing was challenging, prompting modifications in the gripping method to ensure reliable data. By using a longer gauge length, the slippage impact on elastic modulus measurement was minimized, resulting in good repeatability among the test samples. Experimental findings highlighted the significant interaction between fiber waviness and the viscous matrix, leading to stiffness reduction. The linear stiffness of the samples closely matched that of the fibers and remained unaffected by temperature variations. However, at higher temperatures, the epoxy matrix’s decreased viscosity caused an upward shift in the stiffness plot within the non-linear region. To support the experimental findings, a micromechanical model of prepreg tow with fiber waviness was proposed. An RVE model of periodically distributed unidirectional waved cylindrical fibers embedded within the matrix was developed to predict effective material stiffness parameters. The simulation outcomes aligned well with the uniaxial tensile test of the prepreg tow, demonstrating the proposed RVE model’s capability to accurately predict elastic properties, considering factors like fiber arrangement, waviness, and temperature. |
| first_indexed | 2024-03-10T23:50:42Z |
| format | Article |
| id | doaj.art-9d716638baed4c86a9807fc180fdb5ff |
| institution | Directory Open Access Journal |
| issn | 2504-477X |
| language | English |
| last_indexed | 2024-03-10T23:50:42Z |
| publishDate | 2023-07-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Journal of Composites Science |
| spelling | doaj.art-9d716638baed4c86a9807fc180fdb5ff2023-11-19T01:42:21ZengMDPI AGJournal of Composites Science2504-477X2023-07-017831210.3390/jcs7080312Mechanical Properties of Uncured Thermoset Tow Prepreg: Experiment and Finite Element AnalysisMina Derakhshani Dastjerdi0Massimo Carboni1Mehdi Hojjati2Department of Mechanical, Industrial, and Aerospace Engineering, Concordia University, 1455 De Maisonneuve Blvd W., Montreal, QC H3G 1M8, CanadaDepartment of Mechanical, Industrial, and Aerospace Engineering, Concordia University, 1455 De Maisonneuve Blvd W., Montreal, QC H3G 1M8, CanadaDepartment of Mechanical, Industrial, and Aerospace Engineering, Concordia University, 1455 De Maisonneuve Blvd W., Montreal, QC H3G 1M8, CanadaThis paper presents an experimental analysis of the tensile behavior of unidirectional carbon/epoxy prepreg, focusing on the nonlinearity observed at the beginning of the stress–strain curve. Due to the material’s high viscosity, securely holding specimens during testing was challenging, prompting modifications in the gripping method to ensure reliable data. By using a longer gauge length, the slippage impact on elastic modulus measurement was minimized, resulting in good repeatability among the test samples. Experimental findings highlighted the significant interaction between fiber waviness and the viscous matrix, leading to stiffness reduction. The linear stiffness of the samples closely matched that of the fibers and remained unaffected by temperature variations. However, at higher temperatures, the epoxy matrix’s decreased viscosity caused an upward shift in the stiffness plot within the non-linear region. To support the experimental findings, a micromechanical model of prepreg tow with fiber waviness was proposed. An RVE model of periodically distributed unidirectional waved cylindrical fibers embedded within the matrix was developed to predict effective material stiffness parameters. The simulation outcomes aligned well with the uniaxial tensile test of the prepreg tow, demonstrating the proposed RVE model’s capability to accurately predict elastic properties, considering factors like fiber arrangement, waviness, and temperature.https://www.mdpi.com/2504-477X/7/8/312tensile modulusprepregfiber wavinessRVE |
| spellingShingle | Mina Derakhshani Dastjerdi Massimo Carboni Mehdi Hojjati Mechanical Properties of Uncured Thermoset Tow Prepreg: Experiment and Finite Element Analysis Journal of Composites Science tensile modulus prepreg fiber waviness RVE |
| title | Mechanical Properties of Uncured Thermoset Tow Prepreg: Experiment and Finite Element Analysis |
| title_full | Mechanical Properties of Uncured Thermoset Tow Prepreg: Experiment and Finite Element Analysis |
| title_fullStr | Mechanical Properties of Uncured Thermoset Tow Prepreg: Experiment and Finite Element Analysis |
| title_full_unstemmed | Mechanical Properties of Uncured Thermoset Tow Prepreg: Experiment and Finite Element Analysis |
| title_short | Mechanical Properties of Uncured Thermoset Tow Prepreg: Experiment and Finite Element Analysis |
| title_sort | mechanical properties of uncured thermoset tow prepreg experiment and finite element analysis |
| topic | tensile modulus prepreg fiber waviness RVE |
| url | https://www.mdpi.com/2504-477X/7/8/312 |
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