Cyclic Relaxation, Impact Properties and Fracture Toughness of Carbon and Glass Fiber Reinforced Composite Laminates
In this paper, the mechanical properties of fiber-reinforced epoxy laminates are experimentally tested. The relaxation behavior of carbon and glass fiber composite laminates is investigated at room temperature. In addition, the impact strength under drop-weight loading is measured. The hand lay-up t...
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MDPI AG
2021-12-01
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| Online Access: | https://www.mdpi.com/1996-1944/14/23/7412 |
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| author | Mohammed Y. Abdellah Mohamed K. Hassan Ahmed F. Mohamed Ahmed H. Backar |
| author_facet | Mohammed Y. Abdellah Mohamed K. Hassan Ahmed F. Mohamed Ahmed H. Backar |
| author_sort | Mohammed Y. Abdellah |
| collection | DOAJ |
| description | In this paper, the mechanical properties of fiber-reinforced epoxy laminates are experimentally tested. The relaxation behavior of carbon and glass fiber composite laminates is investigated at room temperature. In addition, the impact strength under drop-weight loading is measured. The hand lay-up technique is used to fabricate composite laminates with woven 8-ply carbon and glass fiber reinforced epoxy. Tensile tests, cyclic relaxation tests and drop weight impacts are carried out on the carbon and glass fiber-reinforced epoxy laminates. The surface release energy G<sub>IC</sub> and the related fracture toughness K<sub>IC</sub> are important characteristic properties and are therefore measured experimentally using a standard test on centre-cracked specimens. The results show that carbon fiber-reinforced epoxy laminates with high tensile strength give high cyclic relaxation performance, better than the specimens with glass fiber composite laminates. This is due to the higher strength and stiffness of carbon fiber-reinforced epoxy with 600 MPa compared to glass fiber-reinforced epoxy with 200 MPa. While glass fibers show better impact behavior than carbon fibers at impact energies between 1.9 and 2.7 J, this is due to the large amount of epoxy resin in the case of glass fiber composite laminates, while the impact behavior is different at impact energies between 2.7 and 3.4 J. The fracture toughness K<sub>IC</sub> is measured to be 192 and 31 MPa √m and the surface energy G<sub>IC</sub> is measured to be 540.6 and 31.1 kJ/m<sup>2</sup> for carbon and glass fiber-reinforced epoxy laminates, respectively. |
| first_indexed | 2024-03-10T04:49:15Z |
| format | Article |
| id | doaj.art-46d35b772288438b9e87ad71d77d513c |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-10T04:49:15Z |
| publishDate | 2021-12-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-46d35b772288438b9e87ad71d77d513c2023-11-23T02:43:09ZengMDPI AGMaterials1996-19442021-12-011423741210.3390/ma14237412Cyclic Relaxation, Impact Properties and Fracture Toughness of Carbon and Glass Fiber Reinforced Composite LaminatesMohammed Y. Abdellah0Mohamed K. Hassan1Ahmed F. Mohamed2Ahmed H. Backar3Mechanical Engineering Department, College of Engineering and Islamic Architecture, Umm Al-Qura University, Makkah 21955, Saudi ArabiaMechanical Engineering Department, College of Engineering and Islamic Architecture, Umm Al-Qura University, Makkah 21955, Saudi ArabiaMechanical Engineering Department, College of Engineering and Islamic Architecture, Umm Al-Qura University, Makkah 21955, Saudi ArabiaMechanical Engineering Department, College of Engineering and Islamic Architecture, Umm Al-Qura University, Makkah 21955, Saudi ArabiaIn this paper, the mechanical properties of fiber-reinforced epoxy laminates are experimentally tested. The relaxation behavior of carbon and glass fiber composite laminates is investigated at room temperature. In addition, the impact strength under drop-weight loading is measured. The hand lay-up technique is used to fabricate composite laminates with woven 8-ply carbon and glass fiber reinforced epoxy. Tensile tests, cyclic relaxation tests and drop weight impacts are carried out on the carbon and glass fiber-reinforced epoxy laminates. The surface release energy G<sub>IC</sub> and the related fracture toughness K<sub>IC</sub> are important characteristic properties and are therefore measured experimentally using a standard test on centre-cracked specimens. The results show that carbon fiber-reinforced epoxy laminates with high tensile strength give high cyclic relaxation performance, better than the specimens with glass fiber composite laminates. This is due to the higher strength and stiffness of carbon fiber-reinforced epoxy with 600 MPa compared to glass fiber-reinforced epoxy with 200 MPa. While glass fibers show better impact behavior than carbon fibers at impact energies between 1.9 and 2.7 J, this is due to the large amount of epoxy resin in the case of glass fiber composite laminates, while the impact behavior is different at impact energies between 2.7 and 3.4 J. The fracture toughness K<sub>IC</sub> is measured to be 192 and 31 MPa √m and the surface energy G<sub>IC</sub> is measured to be 540.6 and 31.1 kJ/m<sup>2</sup> for carbon and glass fiber-reinforced epoxy laminates, respectively.https://www.mdpi.com/1996-1944/14/23/7412relaxationdrop weightcyclicfibercomposites |
| spellingShingle | Mohammed Y. Abdellah Mohamed K. Hassan Ahmed F. Mohamed Ahmed H. Backar Cyclic Relaxation, Impact Properties and Fracture Toughness of Carbon and Glass Fiber Reinforced Composite Laminates Materials relaxation drop weight cyclic fiber composites |
| title | Cyclic Relaxation, Impact Properties and Fracture Toughness of Carbon and Glass Fiber Reinforced Composite Laminates |
| title_full | Cyclic Relaxation, Impact Properties and Fracture Toughness of Carbon and Glass Fiber Reinforced Composite Laminates |
| title_fullStr | Cyclic Relaxation, Impact Properties and Fracture Toughness of Carbon and Glass Fiber Reinforced Composite Laminates |
| title_full_unstemmed | Cyclic Relaxation, Impact Properties and Fracture Toughness of Carbon and Glass Fiber Reinforced Composite Laminates |
| title_short | Cyclic Relaxation, Impact Properties and Fracture Toughness of Carbon and Glass Fiber Reinforced Composite Laminates |
| title_sort | cyclic relaxation impact properties and fracture toughness of carbon and glass fiber reinforced composite laminates |
| topic | relaxation drop weight cyclic fiber composites |
| url | https://www.mdpi.com/1996-1944/14/23/7412 |
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