Fracture Behavior of a Unidirectional Carbon Fiber-Reinforced Plastic under Biaxial Tensile Loads
In order to clarify the fracture behavior of a unidirectional CFRP under proportional loading along the fiber (0°) and fiber vertical (90°) directions, a biaxial tensile test was carried out using a cruciform specimen with two symmetric flat indentations in the thickness direction. Three fracture mo...
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MDPI AG
2024-03-01
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| Online Access: | https://www.mdpi.com/1996-1944/17/6/1387 |
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| author | Kosuke Sanai Sho Nakasaki Mikiyasu Hashimoto Arnaud Macadre Koichi Goda |
| author_facet | Kosuke Sanai Sho Nakasaki Mikiyasu Hashimoto Arnaud Macadre Koichi Goda |
| author_sort | Kosuke Sanai |
| collection | DOAJ |
| description | In order to clarify the fracture behavior of a unidirectional CFRP under proportional loading along the fiber (0°) and fiber vertical (90°) directions, a biaxial tensile test was carried out using a cruciform specimen with two symmetric flat indentations in the thickness direction. Three fracture modes were observed in the specimens after the test. The first mode was a transverse crack (TC), and the second was fiber breakage (FB). The third mode was a mixture mode of TC and FB (TC&FB). According to the measured fracture strains, regardless of the magnitude of the normal strain in the 0° direction, TC and TC&FB modes occurred when the normal strain in the 90° direction, <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mrow><mi>ε</mi></mrow><mrow><mi>y</mi></mrow></msub></mrow></semantics></math></inline-formula>, ranged from 0.08% to 1.26% (positive values), and the FB mode occurred when <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mrow><mi>ε</mi></mrow><mrow><mi>y</mi></mrow></msub></mrow></semantics></math></inline-formula> ranged from −0.19% to −0.79% (negative values). The TC&FB mode is a unique mode that does not appear as a failure mode under uniaxial tension; it only occurs under biaxial tensile loading. Biaxial tensile tests were also conducted under non-proportional loading. The result showed three fracture modes similarly to the proportional loading case, each of which was also determined by the positive or negative value of <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mrow><mi>ε</mi></mrow><mrow><mi>y</mi></mrow></msub></mrow></semantics></math></inline-formula>. Thus, this study reveals that the occurrence of each fracture mode in a unidirectional CFRP is characterized by only one parameter, namely <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mrow><mi>ε</mi></mrow><mrow><mi>y</mi></mrow></msub></mrow></semantics></math></inline-formula>. |
| first_indexed | 2024-04-24T18:02:57Z |
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| id | doaj.art-b80a70e2e23a4db0853a71146ac95c79 |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-04-24T18:02:57Z |
| publishDate | 2024-03-01 |
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| spelling | doaj.art-b80a70e2e23a4db0853a71146ac95c792024-03-27T13:52:42ZengMDPI AGMaterials1996-19442024-03-01176138710.3390/ma17061387Fracture Behavior of a Unidirectional Carbon Fiber-Reinforced Plastic under Biaxial Tensile LoadsKosuke Sanai0Sho Nakasaki1Mikiyasu Hashimoto2Arnaud Macadre3Koichi Goda4Graduate School of Sciences and Technology for Innovation, Yamaguchi University, Ube 755-8611, JapanGraduate School of Sciences and Technology for Innovation, Yamaguchi University, Ube 755-8611, JapanGraduate School of Sciences and Technology for Innovation, Yamaguchi University, Ube 755-8611, JapanDepartment of Mechanical Engineering, Yamaguchi University, Ube 755-8611, JapanDepartment of Mechanical Engineering, Yamaguchi University, Ube 755-8611, JapanIn order to clarify the fracture behavior of a unidirectional CFRP under proportional loading along the fiber (0°) and fiber vertical (90°) directions, a biaxial tensile test was carried out using a cruciform specimen with two symmetric flat indentations in the thickness direction. Three fracture modes were observed in the specimens after the test. The first mode was a transverse crack (TC), and the second was fiber breakage (FB). The third mode was a mixture mode of TC and FB (TC&FB). According to the measured fracture strains, regardless of the magnitude of the normal strain in the 0° direction, TC and TC&FB modes occurred when the normal strain in the 90° direction, <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mrow><mi>ε</mi></mrow><mrow><mi>y</mi></mrow></msub></mrow></semantics></math></inline-formula>, ranged from 0.08% to 1.26% (positive values), and the FB mode occurred when <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mrow><mi>ε</mi></mrow><mrow><mi>y</mi></mrow></msub></mrow></semantics></math></inline-formula> ranged from −0.19% to −0.79% (negative values). The TC&FB mode is a unique mode that does not appear as a failure mode under uniaxial tension; it only occurs under biaxial tensile loading. Biaxial tensile tests were also conducted under non-proportional loading. The result showed three fracture modes similarly to the proportional loading case, each of which was also determined by the positive or negative value of <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mrow><mi>ε</mi></mrow><mrow><mi>y</mi></mrow></msub></mrow></semantics></math></inline-formula>. Thus, this study reveals that the occurrence of each fracture mode in a unidirectional CFRP is characterized by only one parameter, namely <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mrow><mi>ε</mi></mrow><mrow><mi>y</mi></mrow></msub></mrow></semantics></math></inline-formula>.https://www.mdpi.com/1996-1944/17/6/1387carbon fibersepoxy resinunidirectional laminatebiaxial testfracture mode |
| spellingShingle | Kosuke Sanai Sho Nakasaki Mikiyasu Hashimoto Arnaud Macadre Koichi Goda Fracture Behavior of a Unidirectional Carbon Fiber-Reinforced Plastic under Biaxial Tensile Loads Materials carbon fibers epoxy resin unidirectional laminate biaxial test fracture mode |
| title | Fracture Behavior of a Unidirectional Carbon Fiber-Reinforced Plastic under Biaxial Tensile Loads |
| title_full | Fracture Behavior of a Unidirectional Carbon Fiber-Reinforced Plastic under Biaxial Tensile Loads |
| title_fullStr | Fracture Behavior of a Unidirectional Carbon Fiber-Reinforced Plastic under Biaxial Tensile Loads |
| title_full_unstemmed | Fracture Behavior of a Unidirectional Carbon Fiber-Reinforced Plastic under Biaxial Tensile Loads |
| title_short | Fracture Behavior of a Unidirectional Carbon Fiber-Reinforced Plastic under Biaxial Tensile Loads |
| title_sort | fracture behavior of a unidirectional carbon fiber reinforced plastic under biaxial tensile loads |
| topic | carbon fibers epoxy resin unidirectional laminate biaxial test fracture mode |
| url | https://www.mdpi.com/1996-1944/17/6/1387 |
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