2021 Vol. 36, No. 2

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Materials Research
Lattice Boltzmann Simulation of Thermal Marangoni Convection of Al2O3-H2O Nanofluids in Square Cavity
LU Qiaoying
2021, 36(2): 1-10.
[Abstract](270) [PDF 6741KB](11)
Abstract:
The heat transfer effect of nanofluid in thermal marangoni convection was studied by using lattice Boltzmann method. The effects of nanoparticle volume fraction, particle shape and marangoni number(Ma) were analyzed. As a result, the heat transfer effect of nanofluids was affected by the ratio of length to radius. The larger the shape factor, the larger the average Nu number. As the volume fraction increased, cylinder, platelet, and brick nanoparticles all could reduce the average Nu number of thermal marangoni convection and spherical nanoparticles could increase the average Nu number. Besides, the larger Ma was, the larger the free surface velocity of the thermal marangoni convection of nanofluids was, and the convection heat transfer effect could also be enhanced.
Synthesis of 5-Chloro-3-Nitrospiropyran and Recognition of Ag+ and Organic Amines
LI Xiaojuan, TIAN Jintao
2021, 36(2): 11-18.
[Abstract](74) [PDF 7190KB](7)
Abstract:
The 5-chloro-3-nitrospiropyran was synthesized and its spectral properties as well as recognitions on metal ions and organic amines were conducted. The results showed that the spiropyran was solvochromic and the closed-loop structure was stable in non-polar solvents while in polar solvents it was the ring-opened structure MC. The spiropyran could specifically recognize Ag+ from eighteen common metal ions, and could recognize 16 kinds of organic amines and divide them into four classes.
Study on Flame Retardancy Promotion of Fiber Reinforced Epoxy Composites via RTM Processing
LI Jidi, MEI Yong, WANG Jiaqi, PAN Qichao, GENG Zhi, ZHANG Lianwang, BAO Jianwen, ZHU Bo
2021, 36(2): 19-25.
[Abstract](193) [PDF 3042KB](16)
Abstract:
By designing a new type of flame retardant tackifier, DHQEP/ET3228, the flame retardant fiber reinforced epoxy composite was successfully fabricated via RTM process. DHQEP with epoxy functional group was synthesized to design the reactive flame retardant tackifier, which showed excellent flame retardancy(the LOI value reached to 36.8%) and retained the controllability of the preform dimensions(the springback angle was 1.24°). Meanwhile, the flame retardant tackifier would take part in the curing process and showed excellent compatibility with epoxy resin. Therefore, the interlaminar shear strength of the flame retardant fiber reinforced epoxy resin composite could also be maintained.
Microscopic Analysis of Compression Response of Carbon Fiber Composites
LÜ Chao, LI Feng, SUN Xinyang
2021, 36(2): 26-34.
[Abstract](344) [PDF 13558KB](17)
Abstract:
An experimental platform was designed, and the sensitivity coefficient between the fiber compression strain and the resistance calibrated. The calibrated fibers are made into single-filament and multi-filament composite material system compression test specimens. Under the compressive load conditions, the influence of fiber fracture of multi-filament composite material specimen on surrounding fibers was investigated, and the maximum deformation of the fiber at the fracture was measured accurately. On the above basis, numerical methods were adopted to simulate the damage process of the micro-buckling of fibers around the fracture caused by the stress distribution of the matrix.
Effect of Chemical Composition and Heat Treatment Process on Mechanical Properties of TA5 Alloy Bars
WANG Yuan, DONG Jian, XIE Li, ZHAO Minquan
2021, 36(2): 35-38.
[Abstract](137) [PDF 4183KB](13)
Abstract:
The effects of chemical composition and heat treatment process on mechanical properties of TA5 alloy bars were investigated. The results showed that the strength of TA5 alloy bars increased obviously while the plasticity declined slightly by increasing the content of aluminum, oxygen and nitrogen elements to enhance aluminum equivalence. With increase of annealing temperature between 700℃ and 800℃, the strength declined and the plasticity rose. The strength and plasticity of TA5 alloy bars could best match when heat treatment temperature was between 740℃ and 780℃. Compared with air cooling, the strength of TA5 alloy bars declined and the plasticity rose evidently when combination of furnace cooling and then air cooling was adopted.
Delamination Numerical Simulation and Stamping Test of Copper-Steel Clad Plate Half Bend
SUN Shaohua, DONG Shengchao, REN Guanpeng, QIU Shengwen, GUO Ning
2021, 36(2): 39-43.
[Abstract](154) [PDF 9044KB](12)
Abstract:
The copper-steel clad plate half bend has small bending radius and large stamping deformation, which can lead to crack and delamination of the composite surface. In this paper, the numerical simulation of half bend was carried out by ABAQUS finite element software, the thickness and stress of half bend at forming temperatures of 600℃, 700℃, 800℃ and 900℃ were analyzed. The forming experiment of copper-steel clad plate half bend was carried out. The results showed that increasing temperature could reduce half bend stress and interfacial stress, and had little effect on the thickness variation. When the copper-steel was half bend at 900℃, there was no delamination at the composite interface.
Fabrication and Tribological Properties of Diamond-Like Carbon Film on Copper Alloy Gasket
LUO Yanze, DUAN Tianying, LI Zhiqiang, WANG Yongxin
2021, 36(2): 44-48.
[Abstract](183) [PDF 5888KB](11)
Abstract:
DLC film was fabricated on the H62 brass gasket by physical vapor deposition. Raman spectroscopy and cross-sectional morphology observation were performed on the film, and the thickness, nanohardness and adhesion strength were tested. Finally, friction-reduction and wear-resistant properties of the DLC film were analyzed after tribological test.Resultsshowed that the thickness of the DLC film on H62 brass gasket was totally 2.31 μm, the thickness of interlayer was approximately 0.49 μm. The hardness of DLC film was 22.1 GPa, and the adhesion between DLC film and the substrate was strong(HF1 for indentation and 41.1 N for scratching). When the H62 brass gasket was coated by DLC film, the friction coefficient decreased from 0.55 to 0.25, the wear rate decreased from 1.3×10-4 mm3/Nm to 1.1×10-5 mm3/Nm, meaning good friction-reduction and wear-resistant properties were achieved. After 10 times assembling and disassembling, the DLC film on gasket was complete, and no significant damage could be detected, therefore, the gasket with film could meet the requirement.
Material Application
Failure Analysis of Copper Alloy Globe Valve
HAN Maosheng, LUO Hao, LIU Lele, ZHANG Yunhao, PAN Hengpei
2021, 36(2): 49-54.
[Abstract](83) [PDF 4608KB](12)
Abstract:
The causes of titanium alloy valve corrosion were analyzed by means of chemical composition, mechanical property analysis, metallographic structure observation, macro and micro morphology observation and corrosion products analysis. The results showed that the composition and structure of globe valve disc could meet the design requirements. Corrosion on sealing surface of globe valve disc was caused by the combined action of decomposition corrosion, erosion and crevice corrosion. Large amount of seawater and sediment in pipelines could promote the appearance of crevices and increase the scouring intensity, which would accelerate the corrosion process.
Pressure-assisted RTM Processing for Ablative Composites
MA Xiuping, GUO Yalin, LIU Siyang, WU Fan, HUO Bingcheng
2021, 36(2): 55-59.
[Abstract](48) [PDF 2028KB](12)
Abstract:
The ablative composites made by processing of die molding and tape wrapping have such problems as low interlaminar strength, debonding, poor ablative resistance, and erosion. A new type pressure-assisted RTM processing was presented. Resin filling process was simulated and the ablative composite materials were prepared. The porosity, mechanical property and ablative performance of the composites were tested. The results showed that the pressure-assisted RTM processing was workable and had superiority, and that the porosity, interlaminar shear strength, line ablation rate and mass ablation rate of the composites were 4.64%, 39.3 MPa, 0.017 mm/s and 0.0538 g/s, respectively. The pressure-assisted RTM processing was applicable for moulding ablative composite materials.
Application Research on Elevated Line of Urban Rail Transit with Resonant Combined Track Bed System
QIAO Zhi, GUO Weihong, WANG Anbin, HUANG Cheng, FAN Yongxin, ZHAO Lei
2021, 36(2): 60-63,87.
[Abstract](51) [PDF 3482KB](7)
Abstract:
The construction technology of resonant combined track bed vibration reduction system for urban rail transit in subway elevated lines was introduced, and online tests on the vibration and noise of the track bed after operation conducted.Resultsshowed that compared with the ordinary track beds, the amount of vibration reduction of the bed system of the combined track bed system reached 18.2 dB, the noise beside the track reduced by 5.1 dBA, the noise under the bridge reduced by 8.1 dBA, and the noise at the horizontal distance of 20 m under the bridge reduced by 2.3 dBA. The combined track bed system had excellent vibration and noise reduction effects, and the construction technology was mature and perfect, which could be applied to the special vibration reduction of urban rail transit.
Weight Reduction Design of Carbon Fiber Torsion Shaft with Constant Torsional Stiffness for EMU
SUN Houli, WEI Kaiyao, YANG Dongxiao, ZHANG Xinggang, MENG Yuchen
2021, 36(2): 64-67.
[Abstract](85) [PDF 2891KB](12)
Abstract:
Finite element analysis(FEA) method was used to design the stiffness of carbon fiber torsion shaft(CFTS). CFTS was prepared by carbon fiber winding process, and tested by torsion stiffness process. The results showed that the torsion stiffness of the CFTS obtained by FEA was 31.08 kN·m2/rad, that the torsion stiffness by testing was 33.52 kN·m2/rad, and that the design error was 7.3%. Therefore, the FEA method could guide the torsional stiffness design of CFTS. Compared with the traditional metal torsion shaft, the weight loss of CFTS reached 74.6%, demonstrating that the weight reduction effect of CFTS was obvious.
Development of Large Heat Input Welding High Strength Steel Plate for Polar Ship
ZHANG Peng, LI Jie, LONG Jie, WANG Xiaoshu, ZHAO Baojun, MA Xiaodong
2021, 36(2): 68-73.
[Abstract](223) [PDF 4161KB](16)
Abstract:
The steel with low C content and carbon equivalent, was added in a small amount of Nb, Ti and large amount of Mn had been designed in micro-alloyed route. The technology of oxide metallurgy was adopted during the smelting process of the steel. The rolling technology of TMCP was controlled at a low rolling temperature and ultra-fast cooling technology was used, for the purpose of controlling the transformation of the microstructure. The microstructure of the steel plate was controlled to be the mixed microstructure of low carbon bainite and ferrite. The mechanical property of the steel plate was excellent and the value of longitudinal KV2 at-60℃ was more than 200 J. The toughness of WM and HAZ were excellent after the steel plate was welded with a large heat input of 100~250 kJ/cm. The steel plate processed by mentioned process could meet the requirement of large heat input welding.
Welding Technology
Research on Effect of Defect Dimension on Diffusion Bonding of Printed Circuit Heat Exchanger
LI Qiulong, XU Zhe, GUO Jiguan, LIU Xiangqian, LI Peiyue, YU Yan
2021, 36(2): 74-78.
[Abstract](68) [PDF 5516KB](11)
Abstract:
To analyze the scale problem of surface defect of heat exchanger plate of PCHE, experimental analysis and research were carried out. The influence of surface defect width of plate on diffusion bonding performance of heat exchanger core mainly studied from two aspects of tensile strength and micro-interface structure. The results showed that when the defect depth was less than 0.1 mm and the width less than 0.82 mm, the surface defect had no influence on the weldability of the PCHE.
Research on Submerged Arc Welding Technology of Medium Thick Low Alloy Q345R Steel Plate
CHEN Siyuan, XUE Genqi, ZHANG Yingjie, ZHENG Yanzhao, WANG Bin
2021, 36(2): 79-82.
[Abstract](165) [PDF 2370KB](20)
Abstract:
The welding process of Q345 R with H10 Mn2 as welding wire and SJ101 as welding flux was studied.Resultsshowed that the tensile strength of the welding joint reached 517 MPa, higher than the minimum 490 MPa of the base material, and that the minimum value of -20℃ low temperature V-shaped impact energy absorption was 98 J, higher than the minimum requirement of 41 J, so the welding joint could meet the I grade requirement of NB/T 47013.2-2011. It manifested that the chosen welding materials and the welding process could satisfy the quality requirement for the submerged arc welding of Q345 R medium thick low alloy steel.
Study on Interface Morphology and Properties of Titanium/Stainless Steel Composite Plate
SHANG Zhixuan, ZHU Lei, FAN Keshe, CAO Lei
2021, 36(2): 83-87.
[Abstract](84) [PDF 3267KB](14)
Abstract:
Here were studied the variation of the welding interface of thick laminated TA1/304 composite plate at different positions from the initiation end along the detonation wave propagation direction. The variation of the composite interface was analyzed as a whole through metallographic analysis and performance detection, and the dynamic change of the interface was systematically studied during the detonation wave propagation process. The results indicated that along the propagation direction of detonation wave, the welding interface morphology experienced the dynamic change process of no wave, wave-forming, amplitude and wavelength increasing, wave stabilizing and wave vanishing. With the change of interface morphology, the shear strength first increased and then stabilized, and finally significantly decreased at the position opposite to the initiation, with the lowest shear strength of 230 MPa. In the range of 300~400 mm from the detonation edge, the interface wave was stable in shape, with the wave amplitude ratio of 0.22 and the shear strength of about 450 MPa.
Review
Analysis on Application of Different Models for Fatigue Crack Propagation Rate of Metallic Materials
ZHANG Yajun, ZHANG Xinyao, ZHANG Yunhao
2021, 36(2): 88-92.
[Abstract](107) [PDF 871KB](21)
Abstract:
Fatigue crack propagation rate of metallic materials is an important index of mechanical property, which is employed for assessment of safe service and prediction of fatigue life for metallic materials and their corresponding components with cracks in them. In this paper, based on different stages of fatigue crack propagation of metallic materials, closure effect, influence of stress ratio on fatigue crack propagation and so on, characteristics of different models for fatigue crack propagation rate were compared and analyzed, which would provide reference for selecting appropriate models in safety design and life prediction.
Experience Exchange
Research on Fiber Reinforced CBT Resin Matrix Composites
WANG Mingming, CHEN Junlei, LI Xiang
2021, 36(2): 93-97.
[Abstract](63) [PDF 776KB](10)
Abstract:
The characteristics and applications of the cyclic butylene terephthalate(CBT) were briefly introduced. The research status of fiber-reinforced CBT resin matrix composites was reviewed, including the preparation process, mechanical properties and applications, and the development of its application in composite material field was summarized and forecasted.
Engineering Development Technology of Deep Underwater Valve
LI Genfei, SHI Wenxiang, JIANG Peng, ZHANG Xinqi, YANG Shanpo
2021, 36(2): 98-102.
[Abstract](185) [PDF 1191KB](12)
Abstract:
The main points of design specifications, material selection principles, design requirements, performance evaluation requirements of underwater valves were introduced and analyzed, which would provide technical support and research basis for the engineering development of underwater valves in China.

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