Abstract
As a kind of typical structure, the hat-shaped structure (HSS) is widely used in carbon fiber reinforced plastics (CFRP) aircraft parts. In this work, a scheme of filling fillers and adding reinforcing plies in R-regions was proposed to strengthen the R-regions of HSS. Moreover, the force analysis of R-region with or without strengthening in R-region under pull-off load was presented. A finite element model was developed to study the failure behavior of R-regions. A series of HSS samples were fabricated by co-curing process. The pull-off tests of HSS were conducted to validate the model, and the failure mechanism of R-regions was further studied by characterizing the macro-micro structure of R-regions in HSS under pull-off load. Results showed that the structural bearing capacity of HSS can be improved by strengthening in R-regions. After strengthening in R-regions, the pull-off load was borne by multiple interfaces, and the interlaminar interface pull-off strength can increase by 38.8 %.
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Acknowledgments
This work was supported by the National Natural Science Foundation of China (No. 51975208 and No. 51775184), the Excellent Youth Project of Hunan Education Department (No. 18B382) and the General Project of Hunan Education Department (No. 18C0306).
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Rong Chen is a Ph.D. candidate of the School of Materials Science and Engineering, Central South University. She is pursuing a Ph.D. degree in Materials Science and Engineering from Central South University. Her research interests include structure, preparation and characterization of composite materials.
Shujian Li received his Ph.D. in Mechanical Engineering from Central South University. At present, he is a teacher of Hunan University of Science and Technology. His research interests are in the field of precision forming and machining of advanced composite materials.
Tae Jo Ko is a Professor of Mechanical Engineering at Yeungnam University, South Korea. He received his B.S. and M.S. from the Pusan National University, Korea, and Ph.D. from POSTECH, Korea. His research interests include machine tools, metal cuttings as well as non-traditional machining, surface texturing using metal cutting, grinding and bio-machining.
Pengnan Li received his Ph.D. in Mechanical Design and Theory from China University of Mining and Technology. Prof. Li is currently a Professor of the School of Mechanical Engineering of Hunan University of Science and Technology, China. His research interests include high speed machining of difficult to cut materials and cutting tool design.
Yong Jiang received his Ph.D. in Materials Science and Engineering, Arizona State Univ, Tempe, USA. At present, he is a Professor of Central South University. His main research is material structure, calculation and characterization.
Changping Li received his M.S. and Ph.D. from the Yeungnam University, Korea. Dr. Li is currently a teacher at College of Mechanical and Electrical Engineering. And Dr. Li is interested in the research of high-speed cutting and composite processing of difficult-to-machine materials.
Qiulin Niu received his Ph.D. in Mechanical Engineering from Shanghai Jiaotong University. He is currently a teacher at College of Mechanical and Electrical Engineering. Dr. Niu is mainly engaged in the research of high-speed cutting of difficult-to-machine materials and ultrasonic vibration assisted processing.
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Rong, C., Shujian, L., Ko, T.J. et al. Failure analysis of R-regions of CFRP hat-shaped structure under pull-off load. J Mech Sci Technol 34, 1219–1225 (2020). https://doi.org/10.1007/s12206-020-0124-5
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DOI: https://doi.org/10.1007/s12206-020-0124-5