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2020 Vol. 63, No. 18
Published: 2020-09-15
FEATURE
FORUM
RESEARCH
C0NTENTS
COVER STORY
APPROACHING SCIENCE
 
       FEATURE
14 Research Development of Interlaminar Reinforcing and Toughening Technique of Carbon Fiber Composites
LU Kangyi,ZHANG Yueyi,YANG Xiaoping,LI Gang,SU Qingfu, GAO Shangbing
DOI: 10.16080/j.issn1671-833x.2020.18.014
The upgraded toughening technique of carbon fiber reinforced polymer was the important approach for preparing high performance composites. In the second-generation composite, thermoplastics have been used to toughen resin matrix by physical blending. In the third-generation composite, interlaminar reinforcing and toughening methods have been developed. Fundamental researches on nanofibers, resin films and particles interlaminar toughening carbon fiber composites have been carried out by Advanced Composites Center (ACC) in Beijing University of Chemical Technology (BUCT), and the scientific problems of method constriction and toughening mechanism were broken through and the engineering application of particle interlaminar toughening was also achieved. Combining with domestic and foreign developments, the accomplishments of ACC teams in interlaminar reinforcing and toughening were reviewed, and the effects of three kinds of interlaminar toughening and corresponding multiscale interlaminar reinforcing and toughening techniques were contrasted. And the application prospect on interlaminar reinforcing and toughening technique was expected.
2020 Vol. 63 (18): 14-23 [Abstract] ( 358 ) HTMLNew PDF (1615 KB)  ( 1324 )
       COVER STORY
24 Research Progress in Damage Diagnostic Imaging of Aerospace Structures Based on Ultrasonic Guided Waves
ZHENG Yuebin,WU Zhanjun,LEI Zhenkun,GAO Dongyue,ZHOU Kai,ZHANG Jiaqi,YANG Zhengyan,ZOU Jianchao
DOI: 10.16080/j.issn1671-833x.2020.18.024
Damage diagnostic imaging approach based on ultrasonic guided waves (UGW) is a research hotspot in the fields of non-destructive testing and structural health monitoring, which can directly reflect the damage location and severity on aerospace structures. This paper summarizes the general process of UGW diagnostic imaging technology, introduces the research status of eight representative imaging algorithms, including phased array imaging, space-wave number filter imaging, inverse-time migration imaging, time reversal imaging, delay-and-sum imaging, model-based imaging, tomographic imaging and probabilistic-based imaging, and compares the application scope, advantages and disadvantages of these imaging algorithms. Then, the challenge and development trend of UGW diagnostic imaging technology are discussed according to the actual industrial application.
2020 Vol. 63 (18): 24-43 [Abstract] ( 204 ) HTMLNew PDF (3423 KB)  ( 1570 )
       FORUM
46 Effects of Ohmic Heating on Interlaminar Shear Strength and Crystalinity of PEEK CFRP Composite
ZHANG Xiaohui, ZHANG Shaolei, ZHU Yuxiang, WANG Ben, DUAN Yugang
DOI: 10.16080/j.issn1671-833x.2020.18.046
In order to meet the requirement of high efficiency heating in automated fiber placement (AFP) of thermoplastic composites, a method of high efficiency heating by using the Ohmic characteristic of PEEK prepreg was studied. Through the mathematical analysis of Ohmic heating convection and radiation heat dissipation, and ABAQUS electrothermal simulation, the basic laws of Ohmic heating of PEEK composite were obtained. The Ohmic heating effect of PEEK composite was experimentally studied by using the designed double-roller electrodes experimental device. The results show that the interlaminar shear strength (ILSS) of the composite by Ohmic heating increases first and then decreases with the increase of heating electric power, and reaching a maximum of 35.6MPa when the electric parameters are DC voltage 30V and current 3.3A. With the increase of the compacting force, the ILSS also increases first and then decreases, and reaching a maximum of 29.5MPa when the compacting force is about 322N. In addition, the crystallinity of prepreg decreases with the increase of temperature, and the effect of compacting force on crystallinity of the prepreg is not obvious.
2020 Vol. 63 (18): 46-54 [Abstract] ( 147 ) HTMLNew PDF (1362 KB)  ( 496 )
55 Buckling and Post-Buckling of Curved Hat-Stiffened Composite Panels Under Combined Internal Pressure and Axial Compression
WANG Houbing, LI Xinxiang, WEI Jingchao, LEI Anmin, CHENG Linan
DOI: 10.16080/j.issn1671-833x.2020.18.055
Experiments on curved hat-stiffened composites panel with 7 stringers and 4 frames were conducted to investigate the buckling load, buckling mode, post-buckling carrying capacity and failure characterization under combined internal pressure and axial compression. The results show that the axial buckling load of the curved hat-stiffened composites panel is increased by the internal pressure when the panel is subjected to combined mechanical loads, and the panel has no buckle before failure. Based on the linear stability theory of shallow composites shell, the analytical methods for the buckling load of the curved hat-stiffened composites panel were presented by utilizing Rayleigh-Ritz method and Kirchhoff hypothesis under internal pressure, axial compression, combined internal pressure and axial compression, an empirical method was proposed to estimate the failure load of the curved hat-stiffened composites panel under combined internal pressure and axial compression. The results by both the present methods and experiments agree very well, the empirical method is clear and concise, which is easy to be applied in design of curved hat-stiffened composites panel.
2020 Vol. 63 (18): 55-64/81 [Abstract] ( 140 ) HTMLNew PDF (2459 KB)  ( 231 )
65 Properties of Epoxy Composites Modified by Boron Nitride Sheets With Different Sizes
ZHENG Xiangdan, WEI Yi, LIU Weiping, LIU Wanshuang
DOI: 10.16080/j.issn1671-833x.2020.18.065
In this study, the effects of three micro-scale and one nano-scale boron nitride sheets on the rheological properties and thermal conductivity of epoxy resins were investigated. The results show that the addition of large microscale boron nitride sheets is more beneficial to improve the thermal conductivity of resulting epoxy composites, and has relatively less influence on the viscosity. When 30% micro-scale boron nitride sheets PT110 and PT120 are added, the thermal conductivity values of modified epoxy resins increase from 0.18W·m–1 ·K–1 to 1.01W·m–1 ·K–1 and 0.94W·m–1 ·K–1 , respectively. Compared with micro-scale boron nitride sheets, the nano-scale boron nitride sheets do not exhibit superiority to improve the thermal conductivity of epoxy resins, but can cause a significant increase in viscosity. The thermal conductivity of epoxy composites modified by different boron nitride were simulated by various theoretical models. Among them, the thermal conductivity values of modified epoxy resins predicted by the geometrical mean model are close to the experimental values. Compared with the unmodified epoxy resins, the epoxy composites modified by optimized boron nitride sheets shows almost the same curing temperatures and glass transition temperature, significantly increased flexural modulus but dramatically decreased flexural strength.
2020 Vol. 63 (18): 65-73 [Abstract] ( 177 ) HTMLNew PDF (1711 KB)  ( 283 )
74 Characterizations of Coefficient of Thermal Expansion and Impact Strength of Modified Nano-SiO2 / Epoxy Resin
HU Bozhao,YUAN Yuhuan,MA Jiwen,WU Zhanjun,CHEN Duo,SUN Tao
DOI: 10.16080/j.issn1671-833x.2020.18.074
Three common silane coupling agents KH550, KH560 and KH570 were used as modifiers to modify the nano-silica respectively. The nano-SiO2/epoxy composite materials were prepared from the three modified nano-silicas. The characterizations of the infrared test of the modified nanoparticles and the dynamic light scattering of the particle size have been tested. The characterizations of the impact strength at normal temperature and coefficient of thermal expansion at low temperature of the prepared composite material have been tested. The results showed that the average particle sizes of SiO2 modified with the three coupling agents are in the range of (200±50)nm.The distribution coefficient (PDI) of the modified SiO2 particles in ethanol is within the range of 0.30±0.05. The effect of different coupling agent modifications on the impact strength of composite materials is small, the difference is not more than 7.37%, but it has the great influence on the CTE of the composite materials. When the concentration of SiO2 is 9%, and under –183℃ , KH560 has the best effect on improving CTE of SiO2 / epoxy composite system among the three coupling agents, while under the same conditions, the CTE of the SiO2 / epoxy composite system modified by KH550 and KH570 are higher about 1.19% and 23.7% respectively.
2020 Vol. 63 (18): 74-81 [Abstract] ( 142 ) HTMLNew PDF (1251 KB)  ( 288 )
       APPROACHING SCIENCE
82 Continuous Innovation and Development of High-Efficiency Grinding Technology and High-End CNC Equipment
2020 Vol. 63 (18): 82-83 [Abstract] ( 84 ) HTMLNew PDF (639 KB)  ( 41 )
       RESEARCH
84 Structural Energy Storage Carbon Fiber Composite Design and Application in Drone
WANG Chaoyang,YANG Xiangtao,XU Xiangbo,ZHANG Jinna,ZHU Shijie,WU Haihong, TONG Liyong
DOI: 10.16080/j.issn1671-833x.2020.18.084
With the rapid development of aerospace field and the continuous opening of low altitude areas in the world, the application of various drones has increased significantly, which results in sky environmental pollution problems, and drives many countries starting clean sky projects. Meanwhile, higher property requirements of drones pose new challenges for composites applications. In this paper, a structural energy storage carbon fiber composite (SESCFC) is fabricated by integrating energy storage core to the ultra-thin carbon fiber composite package, and its electrochemical performance is tested with and without loading. Furthermore, SESCFC is integrated into the wing of self-designed drone, and the improvement on the weight and flight endurance of the drone is evaluated. The results show that the energy density of SESCFC approaches 13.2W·h/kg, and that the power density approaches 119.6 W/kg. Under loading of 1200N, the energy density of SESCFC increased to 14.5 W·h/kg due to space compressed between the electrodes. Compared with drones driven by Li-battery, the flight endurance of the drone with SESCFC increases 20%, and the self-weight decreases 37.5%. Compared with solar panel-driven drones, about 20% lightweight effect has been achieved. The results are helpful for structure-function integrated design of carbon fiber composites and their application in drone design.
2020 Vol. 63 (18): 84-90/101 [Abstract] ( 228 ) HTMLNew PDF (2360 KB)  ( 469 )
91 Research on Tolerance Analysis of Composite Shield Based on Different Positioning References
LIU Yanru, ZHOU Da, YANG Chao, FENG Shaohong, ZHOU Xinkang, XIE Hui
DOI: 10.16080/j.issn1671-833x.2020.18.091
Advanced composite materials are widely used in modern aircraft due to their small specific gravity, high strength and good fatigue performance. The deformation and thickness control of composite parts during thermoforming is difficult, and the rationality of component positioning and tolerance distribution greatly affects the quality and efficiency of aircraft component assembly. In this paper, a composite material shield assembly is taken as an example to study the effect of two different CNC milling edge positioning schemes on the tolerance distribution in the whole assembly process, and use MATLAB software to calculate and simulate the simulation tolerance between each manufacturing tolerance and the final assembly tolerance. The mathematical relationship provides a basis for the positioning of the CNC milling edge and the design of the frame.
2020 Vol. 63 (18): 91-94 [Abstract] ( 130 ) HTMLNew PDF (875 KB)  ( 315 )
95 Design of Fixture Locating Layout for Thin-Walled Part Based on Kriging and FPA
LI Cheng,WANG Zhongqi,TONG Hua,TIAN Shaogang
DOI: 10.16080/j.issn1671-833x.2020.18.095
Owing to the excessive time cost of finite element simulation calculation for thin-walled parts fixture locating layout design, a optimization design method for thin-walled parts fixture positioning based on Kriging surrogate model and flower pollination algorithm (FPA) is proposed. With a given number, the fixture locating layout is treated as the design variable, while the strain energy of thin-walled parts under self-weight as the optimization target. Firstly, the optimal Latin hypercube sampling and finite element analysis are used to generate training samples. Secondly, the training sample is used to construct the fixture positioning optimization agent based on Kriging surrogate model. And thirdly, FPA is applied to search the optimal solution for thin-walled parts fixture locating layout. Finally, the optimization design of the curve thin-walled parts fixture layout under “4–2–1” locating principle is taken as an example to verify the effectiveness of the proposed method.
2020 Vol. 63 (18): 95-101 [Abstract] ( 126 ) HTMLNew PDF (1470 KB)  ( 249 )
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