Numerical and experimental investigation of the interface properties and failure strength of CFRP T-Stiffeners subjected to pull-off load
This paper focuses on interface properties between the composite laminae, and the failure strength of carbon fiber reinforced polymer (CFRP) T-stiffeners in a pull-off test. Interfacial fracture toughness was studied and optimized based on the theoretical method and experimental observations in the...
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| Published in: | Materials & design Vol. 185; p. 108231 |
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| Main Authors: | , , , , |
| Format: | Journal Article |
| Language: | English |
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05-01-2020
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| Abstract | This paper focuses on interface properties between the composite laminae, and the failure strength of carbon fiber reinforced polymer (CFRP) T-stiffeners in a pull-off test. Interfacial fracture toughness was studied and optimized based on the theoretical method and experimental observations in the scanning electron microscope (SEM) view, due to the insertion of fibers or fiber tows into interface adhesive layers created in the manufacturing process. Numerical load-displacement curves associated with different interfacial fracture toughness were calculated and compared with experimental load-displacement curves. It was found that the load-displacement curve calculated by the optimized interfacial fracture toughness was in better agreement with experimental records. Additionally, the filler cracking and interface debonding was numerically predicted using the extended finite element method (XFEM) combined with cohesive zone model (CZM) and experimentally recorded using a high-speed camera. The digital image correlation (DIC) technique was further used to capture deformations and strain distributions in the radius region. Strain distributions obtained from the combined numerical calculation and experimental DIC could help in better understanding the failure mechanisms of CFRP T-stiffeners.
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•We proposed a modification of the interfacial fracture toughness induced by the fiber insertion.•It was simulated that noodle cracking induced interface debonding was responsible for the final failure.•Monitoring by digital image correlation indicated high load in flange direction led to the noodle crack. |
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| AbstractList | This paper focuses on interface properties between the composite laminae, and the failure strength of carbon fiber reinforced polymer (CFRP) T-stiffeners in a pull-off test. Interfacial fracture toughness was studied and optimized based on the theoretical method and experimental observations in the scanning electron microscope (SEM) view, due to the insertion of fibers or fiber tows into interface adhesive layers created in the manufacturing process. Numerical load-displacement curves associated with different interfacial fracture toughness were calculated and compared with experimental load-displacement curves. It was found that the load-displacement curve calculated by the optimized interfacial fracture toughness was in better agreement with experimental records. Additionally, the filler cracking and interface debonding was numerically predicted using the extended finite element method (XFEM) combined with cohesive zone model (CZM) and experimentally recorded using a high-speed camera. The digital image correlation (DIC) technique was further used to capture deformations and strain distributions in the radius region. Strain distributions obtained from the combined numerical calculation and experimental DIC could help in better understanding the failure mechanisms of CFRP T-stiffeners.
[Display omitted]
•We proposed a modification of the interfacial fracture toughness induced by the fiber insertion.•It was simulated that noodle cracking induced interface debonding was responsible for the final failure.•Monitoring by digital image correlation indicated high load in flange direction led to the noodle crack. This paper focuses on interface properties between the composite laminae, and the failure strength of carbon fiber reinforced polymer (CFRP) T-stiffeners in a pull-off test. Interfacial fracture toughness was studied and optimized based on the theoretical method and experimental observations in the scanning electron microscope (SEM) view, due to the insertion of fibers or fiber tows into interface adhesive layers created in the manufacturing process. Numerical load-displacement curves associated with different interfacial fracture toughness were calculated and compared with experimental load-displacement curves. It was found that the load-displacement curve calculated by the optimized interfacial fracture toughness was in better agreement with experimental records. Additionally, the filler cracking and interface debonding was numerically predicted using the extended finite element method (XFEM) combined with cohesive zone model (CZM) and experimentally recorded using a high-speed camera. The digital image correlation (DIC) technique was further used to capture deformations and strain distributions in the radius region. Strain distributions obtained from the combined numerical calculation and experimental DIC could help in better understanding the failure mechanisms of CFRP T-stiffeners. Keywords: CFRP T-stiffener, Filler cracking, Interface debonding, Failure strength |
| ArticleNumber | 108231 |
| Author | Wang, Yi Bian, Kan Liu, Hongguang Ma, Xueshi Xiong, Ke |
| Author_xml | – sequence: 1 givenname: Xueshi surname: Ma fullname: Ma, Xueshi organization: State Key Laboratory of Mechanics and Control of Mechanical Structures, Nanjing University of Aeronautics and Astronautics, Nanjing, 210016, China – sequence: 2 givenname: Kan surname: Bian fullname: Bian, Kan organization: School of Materials Science and Engineering, Nanjing Institute of Technology, Nanjing, 211167, China – sequence: 3 givenname: Hongguang surname: Liu fullname: Liu, Hongguang organization: Faculty of Civil Engineering and Mechanics, Jiangsu University, Zhenjiang, 212013, China – sequence: 4 givenname: Yi surname: Wang fullname: Wang, Yi organization: State Key Laboratory of Mechanics and Control of Mechanical Structures, Nanjing University of Aeronautics and Astronautics, Nanjing, 210016, China – sequence: 5 givenname: Ke surname: Xiong fullname: Xiong, Ke email: kxiong@nuaa.edu.cn organization: State Key Laboratory of Mechanics and Control of Mechanical Structures, Nanjing University of Aeronautics and Astronautics, Nanjing, 210016, China |
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| CitedBy_id | crossref_primary_10_1016_j_msea_2022_143697 crossref_primary_10_3390_polym15061436 crossref_primary_10_1080_26889277_2022_2094839 crossref_primary_10_3390_s23041777 crossref_primary_10_1016_j_ijmecsci_2020_105968 crossref_primary_10_1007_s13726_023_01156_x crossref_primary_10_1016_j_ceramint_2023_06_234 crossref_primary_10_3390_pr11092640 crossref_primary_10_1016_j_ijmecsci_2020_105541 crossref_primary_10_1016_j_compstruct_2021_114266 crossref_primary_10_1177_07316844241238835 crossref_primary_10_1016_j_matdes_2023_111686 crossref_primary_10_1016_j_engfracmech_2020_107107 crossref_primary_10_1080_15376494_2024_2303726 |
| Cites_doi | 10.1016/j.matdes.2013.11.036 10.1016/j.compstruct.2017.04.070 10.1016/S0020-7683(03)00026-X 10.1002/(SICI)1097-0207(19990620)45:5<601::AID-NME598>3.0.CO;2-S 10.1016/S0263-8223(00)00006-4 10.1016/j.compstruct.2014.12.011 10.1016/j.compstruct.2011.03.009 10.1016/j.compstruct.2010.06.028 10.1177/0021998313477169 10.1016/j.compositesa.2012.03.023 10.4028/www.scientific.net/KEM.774.197 10.1016/0266-3538(96)00005-X 10.1177/0731684402021017474 10.1016/j.compscitech.2012.09.008 10.1016/j.engfracmech.2006.06.012 10.1007/s10443-016-9520-5 10.1016/j.compstruct.2015.04.019 10.1016/j.compstruct.2011.06.022 10.1177/0021998313503390 10.1177/002199839603000203 10.1016/j.compositesa.2011.12.021 |
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| Keywords | Filler cracking Interface debonding CFRP T-stiffener Failure strength |
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| SubjectTerms | CFRP T-stiffener Failure strength Filler cracking Interface debonding |
| Title | Numerical and experimental investigation of the interface properties and failure strength of CFRP T-Stiffeners subjected to pull-off load |
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