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2020 Vol. 63, No. 15
Published: 2020-08-01
FEATURE
FORUM
C0NTENTS
COVER STORY
APPROACHING SCIENCE
SPECIAL TOPIC
 
       FEATURE
14 Experimental Study on Load-Bearing Property of 2D–C/SiC U-Beams
YANG Chengpeng,LI Jun,HE Zongbei, JIAO Guiqiong
DOI: 10.16080/j.issn1671-833x.2020.15.014

Load-bearing properties of typical ceramic matrix composite structures have rarely been studied. In this paper, the damage and fracture characteristics of 2D–C/SiC channel beams under bending-twist combined loadings were investigated experimentally. The load-bearing properties, damage process and failure mechanisms of the beam specimens were analyzed through strain monitoring and crack observation. It reveals that delamination and buckling are the main damage modes of 2D–C/SiC channel beam under complex loading, and the fracture process of the specimens is extremely complicated, accompanying with fluctuant and mutational strain response, meanwhile, its mechanical property is significantly degraded resulting in a low ultimate load carrying capacity. Comparing with intact specimen, the damage and fracture mechanism of the counterpart with open-hole is changed, and the delamination initiation and local buckling loads are obviously reduced.
2020 Vol. 63 (15): 14-21 [Abstract] ( 317 ) HTMLNew PDF (24752 KB)  ( 128 )
       COVER STORY
22 Research Progress on Influence Mechanism of Interface and Construction of Interphase of High-Strength/High-Modulus Carbon Fiber Composites
SUN Yuhang,ZHANG Yueyi,YANG Xiaoping,LI Gang,WEI Zhenhai
DOI: 10.16080/j.issn1671-833x.2020.15.022
The interface engineering of composites has always been a hot research topic of carbon fiber reinforced polymer composites. The interphase acted as a “bridge” for transferring load between carbon fiber and resin matrix, and affected the implement efficiency of stiffness and strength of composites. Therefore, the design and adjustment of interphase played an important role in enhancing the interfacial properties and improving macro-mechanical properties of carbon fiber composites. In view of the influence factors such as surface physical and chemical characteristics of highstrength/high-modulus carbon fiber, the performance matching between carbon fiber and resin matrix and the different surface graphite-like structures, the correlation mechanisms of interface enhancement with the surface structure of carbon fiber and modulus of resin matrix were briefly outlined, and the research progress and interface enhancement effect of constructing new interphase of high temperature resistance and molecular assembly were reviewed. Finally, the development strategy of interphase with balance of rigidity and flexibility of carbon fiber composites was proposed.
2020 Vol. 63 (15): 22-31 [Abstract] ( 338 ) HTMLNew PDF (6394 KB)  ( 862 )
       FORUM
34 A Review on Autoclave Process Simulation for Composites Manufacturing
XU Qiang
DOI: 10.16080/j.issn1671-833x.2020.15.034
Process simulation plays an important role on modelling the fabrication process for manufacturing large geometrically structural components. In the western developed countries, simulation technology has widely used in manufacturing of the primary composite structures. In past ten years, we have obtained stage achievement on studying the modeling of composites manufacturing processes, but their use remains still limited due to the lack of fully validated modelling tools in contrast to the advanced international level. Hence, in this study, the autoclave process simulation for composites manufacturing is reviewed in detail. The requirements for the aerospace of the process simulation are presented by our previous works on the autoclave process simulations. The research efforts in the future are probably going to focus on the development of the autoclave process simulation during the composites manufacturing process.
2020 Vol. 63 (15): 34-38/47 [Abstract] ( 454 ) HTMLNew PDF (3450 KB)  ( 342 )
39 Status and Challenge of Materials Extrusion Additive Manufacturing for HighPerformance Fiber Reinforced Poly (ether ether ketone) Composites
LUO Meng,TIAN Xiaoyong, SHANG Junfan,Qin Yingjie, ZHU Weijun,LI Dichen1,CHEN Yi
DOI: 10.16080/j.issn1671-833x.2020.15.039
Materials extrusion as a classical additive manufacturing process can melt, extrude and fabricate the thermoplastic components or their composites layer by layer. It has the advantages of no-molding, ability to form complex structure and low cost, thus to be used in medical, aerospace, and automobile fields. Poly (ether ether ketone), as a kind of semi-crystalline thermoplastic polymer, has many excellent characteristics such as light weight, high strength, good thermal stability, and corrosion resistance. It’s components can be fabricated by materials extrusion technology in low cost. In this paper, the development status of the materials extrusion of fiber reinforced poly (ether ether ketone) composites were introduced. The mechanism of the process, development process of the technology and detailed performance comparison were respectively discussed. In the end, the challenges of the fiber reinforced poly (ether ether ketone) composites extrusion for further development were analyzed.
2020 Vol. 63 (15): 39-47 [Abstract] ( 316 ) HTMLNew PDF (5091 KB)  ( 771 )
48 Application of Dielectric Analysis in Curing Process of Carbon Fiber Reinforced Bismaleimide Composites
LUO Wei,SONG Zhimei, CHENG Yong,CHEN Guiyong,YANG Longying, WEN Yihuan
DOI: 10.16080/j.issn1671-833x.2020.15.048
The online monitoring and optimization of the curing process of bismaleimide (BMI) /carbon fiber composites formed by typical resin membrane fusion and infiltration process were studied by dynamic dielectric analysis (DEA). The optimized process showed 3.5h shortage of curing time compared to the original procedure. And the feasibility of DEA method for composite solidification process optimization was verified by differential scanning calorimetry (DSC) analysis, static and dynamic mechanical properties of composite materials cured under two different curing process.
2020 Vol. 63 (15): 48-52 [Abstract] ( 267 ) HTMLNew PDF (2218 KB)  ( 282 )
53 Research on Composite Ply Typesetting Based on Packing
LIU Lan, CAO Zhipeng, HU Yeqin, PANG Jing
DOI: 10.16080/j.issn1671-833x.2020.15.053
Based on the practical production experience, this paper explores the methods to improve the utilization rate of materials. Based on the analysis of the algorithm of the rectangle and the special shape, the rule of the best placement strategy is established. After the verification of the modification process of the skin allowance, the reference basis for the allowance setting is provided, and the general part allowance setting principle is creatively proposed. Waste is reduced due to imprecise margin setting. Through the implementation of the program, the waste of materials is effectively reduced and the utilization rate of raw materials is improved.
2020 Vol. 63 (15): 53-57 [Abstract] ( 242 ) HTMLNew PDF (3673 KB)  ( 298 )
       APPROACHING SCIENCE
58 Promoting the In-Depth Development of Manufacturing Process Testing by Civil Military Integration
2020 Vol. 63 (15): 58-59 [Abstract] ( 198 ) HTMLNew PDF (652 KB)  ( 117 )
       SPECIAL TOPIC
60 Review of Flexible Sensor Networks for Structural Health Monitoring of Aircraft Smart Skin
WANG Yu,QIU Lei,HUANG Yongan
DOI: 10.16080/j.issn1671-833x.2020.15.060
Aircraft smart skin technology is a revolutionary new technology that can change the future advanced aircraft design, and structural health monitoring (SHM) is one of its essential functions. To realize the SHM of aircraft smart skin, it is necessary to integrate large-scale and flexible sensor networks into aircraft structures. According to the actual requirements and limitations of aircraft smart skin applications, combined with different structural health monitoring methods, the design, manufacturing process and function realization of the corresponding flexible sensor networks are reviewed. Finally, the key challenges faced by the development of aircraft smart skin technology in the future are summarized and prospected.
2020 Vol. 63 (15): 60-69/80 [Abstract] ( 424 ) HTMLNew PDF (38720 KB)  ( 192 )
70 Review of Flexible Sensor Networks for Structural Health Monitoring of Aircraft Smart Skin
YAN Shuo, SUN Baozhong, GU Bohong
DOI: 10.16080/j.issn1671-833x.2020.15.070
Aircraft smart skin technology is a revolutionary new technology that can change the future advanced aircraft design, and structural health monitoring (SHM) is one of its essential functions. To realize the SHM of aircraft smart skin, it is necessary to integrate large-scale and flexible sensor networks into aircraft structures. According to the actual requirements and limitations of aircraft smart skin applications, combined with different structural health monitoring methods, the design, manufacturing process and function realization of the corresponding flexible sensor networks are reviewed. Finally, the key challenges faced by the development of aircraft smart skin technology in the future are summarized and prospected.
2020 Vol. 63 (15): 70-80 [Abstract] ( 306 ) HTMLNew PDF (10627 KB)  ( 98 )
81 Research Progress on Weavability of High-Performance Fibers
WU Ning, HAN Meiyue, JIAO Ya’nan, CHEN Li
DOI: 10.16080/j.issn1671-833x.2020.15.081
The weavability of high-performance fibers reflects the damage resistance of high-performance fibers in the weaving forming process. Its performance directly affects the weaving efficiency and the performance and quality of the final composite product. The three-dimensional woven damage characterization and optimization technology were introduced, the research status and progress of the evaluation methods of high-performance fiber weavability were elaborated. Methods of improving the weaving adaptability of different high-performance fibers were summarized. Finally, the problems and main directions to be solved in this field are proposed.
2020 Vol. 63 (15): 81-89 [Abstract] ( 284 ) HTMLNew PDF (10601 KB)  ( 86 )
90 Fabrication, Structures and Properties of Nitride Ceramic Fibers
SHAO Changwei, LONG Xin, ZHANG Shuai, WANG Bing
DOI: 10.16080/j.issn1671-833x.2020.15.090
The nitride ceramic fibers in this paper are a kind of nitrogen-containing continuous ceramic fibers with fine diameter. Some ceramic fibers like alumina fiber and silicon carbide fiber have been widely studied and successfully used in various vehicles. Benefit from the covalent bonded chemical and electronical structures, nitride ceramic fibers not only have the excellent structural stability, but also possess adjustable dielectric properties for electromagnetic wave transparent and absorption applications. In this paper, the development history and structural and functional characteristics of nitride ceramic fibers at home and abroad were briefly introduced. The recent progress and perspective of domestic nitride ceramic fibers were described in detail including the preparation, structure and performance of Si3N4 fibers and SiCN as well as SiBN fibers. These fibers provided reliable reinforcements for functional components applications in harsh environment. The purpose of this whirlwind tour is to promote the understanding, technology and application of nitride ceramic fibers and to attract more participants from industry, university and government to support the development of continuous ceramic fibers.
2020 Vol. 63 (15): 90-101 [Abstract] ( 343 ) HTMLNew PDF (27431 KB)  ( 141 )
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