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2022 Vol. 65, No. 16
Published: 2022-08-15
FEATURE
FORUM
C0NTENTS
COVER STORY
SPECIAL TOPIC
 
1 COVER
2022 Vol. 65 (16): 1-1 [Abstract] ( 80 ) HTMLNew PDF (1526 KB)  ( 52 )
       C0NTENTS
6 CONTENTS
2022 Vol. 65 (16): 6-10 [Abstract] ( 63 ) HTMLNew PDF (389 KB)  ( 35 )
       FEATURE
14 Research Progress on Molding Processes of Fiber Preforms and Performances Simulation of Composites for Aeronautical Complex Structures
GE Jingran，LIU Zengfei，QIAO Jianwei，LIANG Jun
DOI: 10.16080/j.issn1671-833x.2022.16.014
In the process of molding fiber preforms, the internal yarns of composite structures such as aero-engine blade and casing will interact with each other such as extrusion, dislocation, and twisting between fiber bundles, and the warp and weft yarns are irregularly distributed in terms of cross-sectional shape, fiber volume content and path. The highly non-uniformity of the composite mesoscopic structure is extremely susceptible to cause stress concentration in the internal material, which leads to damage. It reduces the reliability of the structure, and significantly increases the difficulty of mechanical performance analysis and evaluation of composite structures. This paper summarizes and reviews the current research status of the mechanical behavior analysis methods for advanced composites and its preformed complex structures from three aspects: simulation of fiber preform molding process, mesoscopic modelling, and mechanical performance analysis. The application of the digital element approach to the simulation of fiber preform molding processes for needle-punched composites and 3D woven composites is highlighted. And the development status of mesoscopic modeling that considers the real structural geometry of composites and mechanical property prediction methods is summarized and evaluated. In view of the problems and challenges of numerical simulation research on the manufacturing processes and mechanical properties of aeronautical complex structures of composites, a research idea of establishing data-driven efficient multiscale analysis method for complex structures by combining virtual fiber molding process simulation is proposed. In this way, the mapping relationship of composite structure molding process–mesoscopic structure–macroscopic mechanical properties is revealed, which will be able to optimize the composite structures manufacturing process and provide theoretical support to further realize the digital technology of aeronautical composite equipment.
2022 Vol. 65 (16): 14-30 [Abstract] ( 324 ) HTMLNew PDF (60615 KB)  ( 501 )
       COVER STORY
32 Research Progress on Applications of Nano-Carbon Composites in Aviation Field
HE Xiaodong, PENG Qingyu, XUE Fuhua, ZHAO Xu
DOI: 10.16080/j.issn1671-833x.2022.16.032
The research of aviation materials plays an important role in supporting and ensuring the development of aviation technology, and is the basis of aviation modernization and high-tech development. Modern aviation industry has put forward higher requirements on the performance of aviation materials in many aspects such as structure and function. The application of composites can well meet these modern needs. Nano-carbon composites can maximize the excellent mechanical and functional properties of nanomaterials such as carbon nanotubes and graphene. Therefore, nano-carbon composites show excellent performance in various aspects such as structural lightweight design, electromagnetic shielding, stealth and heat insulation in the aviation industry. This paper systematizes the important achievements made by domestic and foreign researchers on the structure and functional properties of nano-carbon composites. Compared with conventional metal materials, the research and development of nano-carbon composites provides a feasible development path for realizing the structure–function–intelligence integration of materials.
2022 Vol. 65 (16): 32-43 [Abstract] ( 182 ) HTMLNew PDF (8702 KB)  ( 114 )
       FORUM
46 Research Progress on One-Sided Stitching Technology for Composite Preforms
DONG Jiuzhi，GENG Zhengyan，WANG Liwen，CHEN Yunjun，JIANG Xiuming
DOI: 10.16080/j.issn1671-833x.2022.16.046
In order to better understand the development research progress on one-sided stitching technology for composite preforms, the advantages of one-sided stitching technology are introduced, and the development and application of various one-sided stitching methods are introduced. The molding technology and characteristics, and the applicable scope of various one-sided stitching methods are described, and some problems existing in the development of one-sided stitching are analyzed, so as to provide a targeted selection and research for researchers in the future, and promote the efficient and intelligent development of one-sided stitching technology. Finally, the factors affecting the development in one-sided stitching technology of composite material preforms are analyzed, and the development trend in one-sided stitching technology of composite material preforms is prospected.
2022 Vol. 65 (16): 46-53 [Abstract] ( 202 ) HTMLNew PDF (5573 KB)  ( 627 )
54 Process Parameters Analysis of High-Performance Thermoplastic Composites Heated by Pulse Xenon Lamp
JIN Ziang，HAN Zhenyu，LI Pinhua，LIU Xuli，SUN Shouzheng，FU Hongya
DOI: 10.16080/j.issn1671-833x.2022.16.054
There is no report on the process analysis of high-performance thermoplastic composites heated by a pulse xenon lamp. In view of this problem, the effects of prepreg surface roughness, voltage, pulse width and heat source moving speed on the surface heating temperature of thermoplastic prepreg were studied by single factor test and response surface method. The results show that the smaller the surface roughness is, the more stable the heating temperature is, and the greater the surface roughness is, the greater the heating temperature fluctuations are. The heating temperature increases with the increase of voltage but decreases with the increase of pulse width and speed. For CF/PEEK prepregs, the optimal process parameters are obtained by the response surface method. The voltage, pulse width, speed, frequency, and the distance between lamp and prepreg are 221 V, 2 ms, 125 mm/s, 60 Hz and 10 mm, respectively. In such conditions, the heating temperature is 381 ℃ and the resin melted sufficiently.
2022 Vol. 65 (16): 54-63 [Abstract] ( 132 ) HTMLNew PDF (11287 KB)  ( 181 )
64 Progress of Composite Automated Placement Technology in Aviation Field
WANG Xianfeng，DUAN Shaohua，TANG Shanshan，MA Yuliang
DOI: 10.16080/j.issn1671-833x.2022.16.064
Automated placement technology because of its high efficiency, high quality, high precision, and the advantages of high reliability, has been widely used in all kinds of various structure parts manufacturing of large aircraft, rocket, etc. This paper summarizes the research progress of automated placement technology at home and abroad, and the application of aircraft composite components from three aspects: Automated tape placement technology, automatic fiber placement technology and laying process. Finally, according to the development status and existing problems of domestic automated placement technology, the future development trends are prospected.
2022 Vol. 65 (16): 64-77 [Abstract] ( 187 ) HTMLNew PDF (50036 KB)  ( 320 )
78 Multi-Scale Numerical Simulation of Resin Flow in Advanced Composite Materials Manufactured by Liquid Composite Molding
LI Chen，QIN Xiaochen，CHEN Cheng，GAO Limin，XU Jifeng
DOI: 10.16080/j.issn1671-833x.2022.16.078
Liquid composites molding is a high efficient, low cost and environment friendly process to manufacture composite part. In this paper, multi-scale resin flow numerical simulation model is established and the resin impregnation process of composite liquid molding process is studied by FEM method. The key parameter of permeability is predicted at the micro and meso scales and it is validated by the classical formula and the results in the literature. The results by numerical simulation are compared with the experimental ones. The results show that the approach and model established are of high fidelity with engineering applicability at the micro, meso and macro scales.
2022 Vol. 65 (16): 78-84 [Abstract] ( 211 ) HTMLNew PDF (13658 KB)  ( 217 )
85 Research on Manufacturing Process of Z-Type Stiffened Panel
YAN Enwei，LIU Qi，XUE Hongqian，LI Yujun
DOI: 10.16080/j.issn1671-833x.2022.16.085
Based on the experience of T-type composite stiffened panels, technical issues, such as the fabrication of Z-type stringers, the control of thickness and spring-back on Z-type stringers, the curing deformation predictions of the panel, the control of stringer axis and the trajectory planning of ATL, were mainly researched. By introducing the staggered distribution mode of unvulcanized rubber pad at the fillet, the uniform transmission of pressure of the stringer was ensured. The rational layout of the metal core mold in the semi closed cavity of the Z-typed stringer was used to realize the stable attitude control during curing process. Using the finite element simulation model and the secondary development function of the simulation model, the efficient analysis of the curing deformation of the stiffened panel was achieved. Finally, the overall structure molding and the collaborative control of internal and external quality for Z-type stiffened panel are realized, which provides experience for the development of similar products.
2022 Vol. 65 (16): 85-91/97 [Abstract] ( 185 ) HTMLNew PDF (10743 KB)  ( 147 )
92 Automated Manufacturing Process Study on Composites J-Type Stiffened Panel
YAN Leige, GONG Jiaqian, ZHANG Long, CHENG Yong
DOI: 10.16080/j.issn1671-833x.2022.16.092
The most complex J-type stiffener in the composite reinforced panel is manufactured by using automated bending technology, the core material is manufactured by using automated pultrusion molding technology, and then using the co-bonding method to manufacture the composite material that meets the requirements of reinforced panel. The automated molding technology of composite stiffener and core material has been successfully applied to the manufacture of composite reinforced siding parts, which improves production efficiency and stabilizes product quality. It lays a foundation for the establishment of automated production line of composite stiffened panel.
2022 Vol. 65 (16): 92-97 [Abstract] ( 123 ) HTMLNew PDF (6497 KB)  ( 350 )
       SPECIAL TOPIC
98 Microstructure and Properties of in-Situ Synthesized Ti(C,N)/TC4 Composites by SPS
ZHANG Lan, CHEN Zixuan, MA Huizhong, ZHANG Jidong
DOI: 10.16080/j.issn1671-833x.2022.16.098
Ti(C,N)/TC4 composites were prepared by spark plasma sintering using graphite carbon nitrification (g–C3N4 ) as nitrogen sources and carbon sources. By changing the addition amount of g–C3N4 , the composites with different Ti(C,N) contents were prepared, and the microstructure, hardness and tribological properties of the composites were studied. The results show that Ti(C,N) prepared in-situ is granular, and the overall distribution is gridded, and the interface of Ti(C,N) is well combined with the TC4 matrix. With the increase in the amount of g–C3N4 added, the hardness of the composite material continues to increase, and the friction resistance first increases and then decreases. The composite material prepared by adding mass fraction 5% g–C3N4 has higher hardness and excellent wear resistance. The hardness is 627.68HV, which is 44.4% higher than the pure TC4 titanium alloy sintered sample. The friction coefficient and wear amount are 0.2608 and 0.056 mm3 , respectively, which are 29.3% and 61.6% higher than that of TC4 sintered samples.
2022 Vol. 65 (16): 98-103/125 [Abstract] ( 126 ) HTMLNew PDF (4550 KB)  ( 328 )
104 Research Progress and Development Tendency of Discontinuously Nano-Reinforced Titanium Matrix Composites
WEI Zichao, HAN Yuanfei, LI Shaopeng, HUANG Guangfa, MAO Jianwei, Lü Weijie
DOI: 10.16080/j.issn1671-833x.2022.16.104
Discontinuously reinforced titanium matrix composites, especially in-situ titanium matrix composites, possess excellent mechanical properties and have broad application prospects in aerospace, marine engineering and other national defense fields. The research system in this kind of materials mainly realizes multiple and multiscale strengthening as well as toughening by in-situ microparticles or mixing with nano-reinforcement. However, it is found that compared with micro reinforcements, nano-reinforcements (ceramic nanoparticles, carbon nanomaterials, etc.) are characterized by larger specific area and splendid comprehensive properties. By tactfully designing the microstructure of nano-reinforcements, optimizing the interface of nano-reinforcements and the reinforcement/matrix interface as well as controlling the distribution of nano-reinforcement through the configuration, the development of discontinuously nano-reinforced titanium matrix composites (Nano-reinforced DRTMCs, NRTMCs) can greatly improve the comprehensive mechanical properties of the composites. Therefore, this review mainly summarizes the various preparation methods and technologies of NRTMCs in recent years, deeply discusses the influences of interface structure and spatial configuration on the mechanical properties of NRTMCs, puts forward the essential difficulties and the solutions of NRTMCs at the present stage, and looks forward to the prospective development trend and potential applications of NRTMCs.
2022 Vol. 65 (16): 104-125 [Abstract] ( 132 ) HTMLNew PDF (104520 KB)  ( 145 )
126 Damage Characteristics of 3D Braided Composites Under Multiple Stress Wave Impacts
HU Meiqi, SUN Baozhong, GU Bohong
DOI: 10.16080/j.issn1671-833x.2022.16.126
Three-dimensional (3D) braided composites have obvious advantages over metal materials in high and low temperature environments in which the high ratio of strength/weight is required. Currently the 3D braided composites have been widely applied to the design of high strength and lightweight engineering structures. In this paper, the high-speed camera was used to record the impact deformation process. A split Hopkinson pressure bar and finite element analysis have been employed for studying the single and multiple transverse impact damage behaviors of 3D carbon fiber reinforced epoxy resin braided composites at different ambient temperatures, revealing the thermo-mechanical coupling damage mechanisms under transverse impact loading. We found that the compressive stress on the impact surface of the composite is greater than the tensile stress on the back during single impact pulse, while the tensile stress on the back increases gradually with the deformation of the specimen during multiple impact pulses, which is greater than the compressive stress on the impact surface. The adiabatic temperature rise of the composite is concentrated on the fracture surface at room temperature, while at 210 ℃, the toughness of the composite is enhanced, and the difference of thermal expansion coefficient between matrix and reinforcement leads to the mutual extrusion between epoxy resin and carbon fiber tows. The adiabatic temperature rise is affected by the braided structure, and the surface presents a scattered-shape distribution. The results provide a theoretical basis for the impact damage structural design of braided composites at room and high temperatures, and promote the application of braided composites in the impact engineering structural design and other fields.
2022 Vol. 65 (16): 126-134/151 [Abstract] ( 120 ) HTMLNew PDF (22100 KB)  ( 207 )
135 Research Progress on Numerical Simulation of Mechanical Properties of Textile Composites
QIAN Yixing, YANG Zhenyu, LU Zixing
DOI: 10.16080/j.issn1671-833x.2022.16.135
Guide::null
The textile composites with various fabrics as reinforcement have obvious multi-scale structural characteristics. The multi-scale mechanical behavior of textile composites is difficult to be described accurately by the traditional mechanics method. The numerical simulation method can effectively establish the relationship of the process parameters, the preform structure and the mechanical properties of materials, which would provide the theoretical guidance for the optimal design and application of textile composites. The recent advances in numerical simulation of textile composites were reviewed. First of all, the newest numerical geometric modeling techniques of textile composites were introduced emphatically. Numerical methods for predicting the stiffness, strength and damage evolution of textile composites were then conducted. The advantages and disadvantages of the existing multi-scale analysis methods and their application scope were also discussed. In addition, the application of machine learning in textile composites was briefly introduced. Finally, the existing problems and development direction of the numerical simulation of textile composites were analyzed.
2022 Vol. 65 (16): 135-151 [Abstract] ( 519 ) HTMLNew PDF (19655 KB)  ( 385 )
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