Experimental and Numerical Investigation of Intact, Defective and Repaired Countersunk Composite Joints under Tensile Loading
Bolted joints are commonly used for assembling carbon fiber/resin composite structures. Since drilling may generate defects at hole edges which affect mechanical properties, it is of great engineering significance to develop proper repair methods to restore the mechanical properties of the defective...
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| Format: | Article |
| Language: | English |
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MDPI AG
2022-07-01
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| Series: | Materials |
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| Online Access: | https://www.mdpi.com/1996-1944/15/13/4677 |
| _version_ | 1797442792774959104 |
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| author | Yongjie Huang Zhidong Guan Xian Yi Zhangsong Ni Tian Ouyang Zengshan Li |
| author_facet | Yongjie Huang Zhidong Guan Xian Yi Zhangsong Ni Tian Ouyang Zengshan Li |
| author_sort | Yongjie Huang |
| collection | DOAJ |
| description | Bolted joints are commonly used for assembling carbon fiber/resin composite structures. Since drilling may generate defects at hole edges which affect mechanical properties, it is of great engineering significance to develop proper repair methods to restore the mechanical properties of the defective parts. However, there are few studies on hole edge defects and their repair methods. Therefore, a novelty short fiber filling repair method was proposed to repair defective holes in this study. The mechanical properties of intact, defective and repaired countersunk composite joints were compared and investigated. Experimental tensile tests showed that defective joints had lower initial stiffness and failure loads compared to intact joints, while the mechanical properties were effectively restored after repair. Three-dimensional finite element models were also established to analyze the damage process of the joints. Results of numerical modelling were consistent with the experimental results. The simulations showed that changes in contact behaviors and local deformations caused by hole edge defects led to the low initial stiffness and stiffness transition point of the joint, while this phenomenon was reduced after repair. Additionally, despite different joint types, laminate failure mainly occurred around the hole and countersink. |
| first_indexed | 2024-03-09T12:47:13Z |
| format | Article |
| id | doaj.art-be7778a35c39494686fe982bf78bdb69 |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-09T12:47:13Z |
| publishDate | 2022-07-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-be7778a35c39494686fe982bf78bdb692023-11-30T22:10:42ZengMDPI AGMaterials1996-19442022-07-011513467710.3390/ma15134677Experimental and Numerical Investigation of Intact, Defective and Repaired Countersunk Composite Joints under Tensile LoadingYongjie Huang0Zhidong Guan1Xian Yi2Zhangsong Ni3Tian Ouyang4Zengshan Li5Chengdu Fluid Dynamics Innovation Center, Chengdu 610010, ChinaSchool of Aeronautic Science and Engineering, Beihang University, Beijing 100191, ChinaChina Aerodynamics Research and Development Center, Mianyang 621000, ChinaChengdu Fluid Dynamics Innovation Center, Chengdu 610010, ChinaSchool of Aeronautic Science and Engineering, Beihang University, Beijing 100191, ChinaSchool of Aeronautic Science and Engineering, Beihang University, Beijing 100191, ChinaBolted joints are commonly used for assembling carbon fiber/resin composite structures. Since drilling may generate defects at hole edges which affect mechanical properties, it is of great engineering significance to develop proper repair methods to restore the mechanical properties of the defective parts. However, there are few studies on hole edge defects and their repair methods. Therefore, a novelty short fiber filling repair method was proposed to repair defective holes in this study. The mechanical properties of intact, defective and repaired countersunk composite joints were compared and investigated. Experimental tensile tests showed that defective joints had lower initial stiffness and failure loads compared to intact joints, while the mechanical properties were effectively restored after repair. Three-dimensional finite element models were also established to analyze the damage process of the joints. Results of numerical modelling were consistent with the experimental results. The simulations showed that changes in contact behaviors and local deformations caused by hole edge defects led to the low initial stiffness and stiffness transition point of the joint, while this phenomenon was reduced after repair. Additionally, despite different joint types, laminate failure mainly occurred around the hole and countersink.https://www.mdpi.com/1996-1944/15/13/4677countersunk composite jointsdefectsrepairmechanical behaviorsfinite element |
| spellingShingle | Yongjie Huang Zhidong Guan Xian Yi Zhangsong Ni Tian Ouyang Zengshan Li Experimental and Numerical Investigation of Intact, Defective and Repaired Countersunk Composite Joints under Tensile Loading Materials countersunk composite joints defects repair mechanical behaviors finite element |
| title | Experimental and Numerical Investigation of Intact, Defective and Repaired Countersunk Composite Joints under Tensile Loading |
| title_full | Experimental and Numerical Investigation of Intact, Defective and Repaired Countersunk Composite Joints under Tensile Loading |
| title_fullStr | Experimental and Numerical Investigation of Intact, Defective and Repaired Countersunk Composite Joints under Tensile Loading |
| title_full_unstemmed | Experimental and Numerical Investigation of Intact, Defective and Repaired Countersunk Composite Joints under Tensile Loading |
| title_short | Experimental and Numerical Investigation of Intact, Defective and Repaired Countersunk Composite Joints under Tensile Loading |
| title_sort | experimental and numerical investigation of intact defective and repaired countersunk composite joints under tensile loading |
| topic | countersunk composite joints defects repair mechanical behaviors finite element |
| url | https://www.mdpi.com/1996-1944/15/13/4677 |
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