| Effect of gap and overlap on mode Ⅱ interlaminar fracture toughness of automated fiber placement prepreg laminates |
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| 作者姓名： | Fan ZHANG Xin LIU Yaoyao YE Qisen CHEN Qiang XU Yunbo BI |
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| 作者单位： | 1. China State Key Laboratory of Fluid Power and Mechatronic System, School of Mechanical Engineering,Zhejiang University;2. Key Laboratory of Advanced Manufacturing Technology of Zhejiang Province, School of Mechanical Engineering,Zhejiang University |
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| 基金项目： | the Fundamental Research Funds for the Central Universities, China (No. 2019FZA4001)； |
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| 摘 要： | Automated Fiber Placement(AFP) technology facilitates the manufacturing process of composite structures with complex geometry owing to its high efficiency and accuracy.However,the unavoidable imperfections induced by the automated layup method bring challenges to the stability of the final mechanical properties of composites.The influence of AFP-induced gaps and overlaps on the mode Ⅱ interlaminar fracture process of oven-cured laminates is experimentally investigated and explicitly revealed.End...
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| 收稿时间： | 22 May 2022 |
Effect of gap and overlap on mode II interlaminar fracture toughness of automated fiber placement prepreg laminates |
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| Fan ZHANG,Xin LIU,Yaoyao YE,Qisen CHEN,Qiang XU,Yunbo BI.Effect of gap and overlap on mode II interlaminar fracture toughness of automated fiber placement prepreg laminates[J].Chinese Journal of Aeronautics,2023,36(6):390-401. |
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| Institution: | 1. China State Key Laboratory of Fluid Power and Mechatronic System, School of Mechanical Engineering, Zhejiang University, Hangzhou 310027, China;2. Key Laboratory of Advanced Manufacturing Technology of Zhejiang Province, School of Mechanical Engineering, Zhejiang University, Hangzhou 310027, China |
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| Abstract: | Automated Fiber Placement (AFP) technology facilitates the manufacturing process of composite structures with complex geometry owing to its high efficiency and accuracy. However, the unavoidable imperfections induced by the automated layup method bring challenges to the stability of the final mechanical properties of composites. The influence of AFP-induced gaps and overlaps on the mode II interlaminar fracture process of oven-cured laminates is experimentally investigated and explicitly revealed. End-Notched Flexure (ENF) tests were performed to measure the interlaminar fracture toughness of unidirectional laminates under three different defect configurations, namely “Gap” “Overlap” and “Gap & Overlap”. A marginal decline (about –1.2% in non-precracked tests, –5.1% in precracked tests) and an obvious increase (about 15.2% in non-precracked tests, 5.2% in precracked tests) in fracture toughness were observed for the “Gap” group and the “Overlap” group, respectively. Fractographic studies which involve the metallographic observation and Scanning Electron Microscopy (SEM) observation revealed that the increases in fracture area and crack length helped improve the fracture toughness of the “Overlap” group. However, the resin-rich area with high porosity induced by gaps was detrimental to the delamination resistance. To capture the interlaminar stress distribution local to imperfections, a three-dimensional numerical model was established. Gap defects facilitate the local delamination process, and the overlap defect postpones the damage onset and the propagation. |
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| Keywords: | Automated Fiber Placement (AFP) Defects Delamination Fracture toughness Laminates |
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