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2018 International Conference on Advanced Electronic materials, Computers and materials Engineering, AEMCME 2018

作者： Kong, Huanping Liu, Changkui AECC Beijing Institute of Aeronautical Materials Beijing China Beijing Key Laboratory of Aeronautical Materials Testing and Evaluation Beijing China Aviation Key Laboratory of Science and Technology on Aeronautical Materials Testing and Evaluation Beijing China

As the main metal structure materials, titanium alloys have been widely applied in aerospace and other military industries. Titanium alloy develops on the way of high performance and functionalization. Compared with other materials, titanium alloy has high surface integrity and high fretting damage sensitivity. In this paper, the failure case of TB6 high strength titanium alloy key structural parts is taken as the breakthrough point to analyze the effect of surface fretting wear damage on its performance. The appearance inspection, macro and micro morphology observation and energy spectrum analysis were carried out, and the microstructure examination and hardness test were also adopted. The results showed that the fracture property of lug of TB6 high strength titanium alloy was fatigue fracture, and the fretting wear damage of the inner surface of lug hole was the main reason for the fatigue crack initiation. This case is a typical example of titanium alloy structure failure due to fretting wear, which provides reference for the prevention of the recurrence of such faults. © Published under licence by IOP Publishing Ltd.

关键词： Titanium alloys

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Relationship between Thermal Conductivity and Compressive Strength of Concrete: A Review

SSRN

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SSRN 2022年

作者： Wu, Chao Liu, Shaoqing Guo, Jianping Ma, Hongqiang He, Li School of Transportation Science and Engineering Beihang University 37 Xueyuan Road Beijing100191 China State Key Laboratory of Solid Waste Reuse for Building Materials Beijing Building Materials Academy of Science Research Beijing100041 China School of Ecology and Environment Beijing Technology and Business University 33 Fucheng Road Beijing100048 China College of Civil Engineering and Architecture Hebei University Baoding071002 China Technology Innovation Center for Testing and Evaluation in Civil Engineering of Hebei Province Hebei University Baoding071002 China Department of Civil and Environmental Engineering Imperial College London South Kensington Campus LondonSW7 2AZ United Kingdom

Developing insulation concrete with high strength is essential for the construction of energy saving buildings. This is important to achieve carbon neutrality in the modern building industry. This paper reviews the existing studies in the literature on insulation concrete. This paper aims to reveal the correlation between the thermal conductivity and strength of concrete and identify the most effective method to make insulation concrete with lower thermal conductivity but higher strength. The review is carried out from three perspectives, including the effects of cementitious materials, different foaming methods, and various lightweight aggregates. As for the constituent materials, the blended cement, alkali activated materials, and fibers are reviewed. As for the foaming methods, the chemical and mechanical foaming methods are discussed. As for the lightweight aggregates, cenospheres, porous aggregates, aerogels, and phase change materials are assessed. Finally, the methods for making insulation concrete are evaluated and compared. Recommendations are made to develop concrete with lower thermal conductivity and higher strength. © 2022, The Authors. All rights reserved.

关键词： Thermal insulation

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Effects of gas film hole on mechanical property and oxidative damage of turbine blades

Effects of gas film hole on mechanical property and oxidativ...

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Chinese materials Conference, 2018

作者： Hu, Chunyan Kong, Zhiqiang Liu, Xinling Tao, Chunhu Beijing Institute of Aeronautical Materials Beijing100095 China Beijing Key Laboratory of Aeronautical Materials Testing and Evaluation Beijing100095 China Aviation key Laboratory of Science and Technology on Materials Testing and Evaluation Beijing100095 China

ISBN: (纸本)9783035713848

With the development of aero-engine with high specific flux, high thrus-weight ratio, and high turbine inlet temperature, it is an effective way to improve the cooling efficiency by designing dense gas film holes on the blade surface of the turbine blades, especially at the intake side. However, the introduction of gas film holes destroys the geometrical integrity of the blade structure, resulting in a multiaxial high stress state of the blade material around the small holes, which seriously affects the strength and life of the cooling blades. In addition, the geometry design of the gas film holes also directly affects the temperature and the oxidation rate of the turbine rotor blades. In this paper, the researches on the mechanical properties and oxidative damage of the gas film holes at home and abroad in recent years have been systematically introduced. The effects of gas film holes on the durability and fatigue properties, the high temperature oxidation behavior of single crystal superalloys, and the thin-walled effect of oxidative damage of gas film holes have been systematically described. © 2019 Trans Tech Publications, Switzerland.

关键词： Turbomachine blades

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Service temperature evaluation of cast K465 superalloy turbine vane based on microstructural evolution

Service temperature evaluation of cast K465 superalloy turbi...

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Chinese materials Conference, 2018

作者： Zheng, Zhen Zhou, Jingyi Zhao, Wenxia Zheng, Yunrong AECC Beijing Institute of Aeronautical Materials Beijing100095 China Beijing Key Laboratory on Aeronautical Materials Testing and Evaluation Beijing100095 China Aviation Key Laboratory of Science and Technology on Materials Testing and Evaluation Beijing100095 China Key Laboratory of Aeronautical Materials Testing and Evaluation Aero Engine Corporation of China Beijing100095 China

ISBN: (纸本)9783035713848

The overtemperature in a vane made of cast K465 superalloy was investigated in this paper. The vane was taken from a K465 guide ring after the service for specific period of time. The relationship between the temperature and content of γ´ precipitates was established for the K465 superalloy, which was then used to make the microstructural evolution analysis on failed turbine vane associated with overtemperature. The content of γ´ precipitates in dendritic region and the volume fraction of melting zone in interdendritic region in K465 superalloy were used as the microstructural parameters to check the overtemperature. It is found that there is a sound relationship between the parameters and the temperature. On the basis of this relationship, the microstructural evolution along with temperature variation of the overtemperature K465 turbine vane can be analyzed and the overall service temperature which the K465 guide ring experienced can be evaluated. © 2019 Trans Tech Publications, Switzerland.

关键词： Microstructural evolution

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Fatigue Crack Initiation and Propagation Mechanism of FGH96 PM Superalloy

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IOP Conference Series: materials science and Engineering 2020年第1期729卷

作者： Zhao Kai He Yu-huai AECC Beijing Institute of Aeronautical Materials Beijing 100095 China Beijing Key Laboratory of Aeronautical Materials Testing and Evaluation Beijing 100095 China Key Laboratory of Science and Technology on Aeronautical Materials Testing and Evaluation Aero engine corporation of China Beijing 100095 China Aviation Key Laboratory of Science and Technology on Materials Testing and Evaluation Beijing 100095 China

FGH96 is regarded as a promising powder metallurgy superalloy for high-temperature / pressure turbine disc in aerospace industries due to its high resistance / defect tolerance and high working temperature up to 750 °C. The initiation and propagation mechanism of FGH96 PM superalloy is researched by in-situ fatigue experiments. The result shows that the crack of gap samples initiates and propagates at the same stress level at 25 °C and 300°C. At 300°C, there are no creep characteristics such as the intergranular characteristics found in the sample fracture. The crack at 300°C has a faster initiation and propagation process compared to the crack at 25°C, especially in the late stage of fatigue. The increase of the crack propagation rate of the sample is unrelated to the creep, mainly due to oxidation. Oxidation reduces the fatigue life of materials because it accelerates the initiation and propagation of transgranular cracks.

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Research on Measurement technology of Residual Stress in Rolling Aluminium Alloys

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IOP Conference Series: materials science and Engineering 2020年第2期768卷

作者： Xi Wang AECC Beijing Institute of Aeronautical Materials Beijing 100095 China Beijing Key Laboratory of Aeronautical Materials Testing and Evaluation Beijing 100095 China Aviation Key Laboratory of Science and Technology on Materials Testing and Evaluation Beijing 100095 China Key Laboratory of Aeronautical Materials Testing and Evaluation Aero Engine Corporation of China Beijing 100095 China

In the measurement of textured materials such as Al Alloy sheet, the traditional method of X-ray residual measurement (sin2ψ method) cannot be applied to these materials. In this paper, 2A97 aluminium lithium alloy was used for the study on residual stress measurement of texted materials. The X-ray diffraction method was used to test the orientation distribution function. The elastic constant of the material was calculated theoretically by Ruess model, Voigt model and Neerfeld-Hill model. And the residual stress was calculated. The blind-hole method was used to verify the results. The blind-hole result agreed well with the Neerfeld-Hill model.

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Influence of different surface treatments on fatigue life of 7050 Al alloy

Influence of different surface treatments on fatigue life of...

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Chinese materials Conference, 2018

作者： Li, Nan Li, Haitao Zhou, Jingyi Liu, Hongtao Liu, Changkui Qu, Shiyu AECC Beijing Institute of Aeronautical Materials Beijing100095 China Beijing Key Laboratory of Aeronautical Materials Testing and Evaluation Beijing100095 China Aviation Key Laboratory of Science and Technology on Materials Testing and Evaluation Beijing100095 China Key Laboratory of Aeronautical Materials Testing and Evaluation Aero Engine Corporation of China Beijing100095 China Structure Department Shenyang Aircraft Design Research Institute Shenyang110035 China

ISBN: (纸本)9783035713848

The fatigue life of 7050 Al alloy samples after different surface treatments, i.e., as-machined, anodizing, shot peening, and shot peening followed by anodizing, were tested. The results showed that the shot peening treatment specimens presented the longest average fatigue life. The fatigue life of anodizing treatment specimens decreased by 69.3% and 78.8% at 215 MPa and 260 MPa stress levels than as-machined ones. Introducing the shot peening treatment before anodizing could increase the fatigue life by 220% / 296.9% at 215 MPa/260 Mpa than that only treated by anodizing. The effect of the surface treatments on the fatigue life were studied by performing surface morphology investigation, residual stress measurements and fracture surface analysis. © 2019 Trans Tech Publications, Switzerland.

关键词： Residual stresses

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Study on the Dissolution Mechanism of aviation Hydraulic Oil–Nitrogen Gas Based on Molecular Dynamics

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Processes 2025年第5期13卷 1564-1564页

作者： Qingtai Guo Changming Zhang Hui Zhang Tianlei Zhang Dehai Meng School of Mechanical Engineering Shaanxi University of Technology Hanzhong 723001 China Engineering Research Center of Manufacturing and Testing for Landing Gear and Aircraft Structural Parts Universities of Shaanxi Province Hanzhong 723001 China Shaanxi Key Laboratory of Advanced Manufacturing and Health Management for Aviation Components Universities of Shaanxi Province Hanzhong 723001 China Shaanxi Provincial “Four Main Bodies and One Union” University-Enterprise Joint Research Center for Aircraft Landing Gear Advanced Manufacturing and Aviation Component Performance Test Shaanxi University of Technology Hanzhong 723001 China School of Materials Science and Engineering Shaanxi University of Technology Hanzhong 723001 China School of Chemical and Environmental Sciences Shaanxi University of Technology Hanzhong 723001 China

The shock absorbers in the landing gear absorb and dissipate a significant amount of kinetic energy generated from impacts during the landing and taxiing phases to ensure the stability and safety of the aircraft. The nitrogen–oil binary system is a commonly used energy absorption medium in these shock absorbers. Nevertheless, the interplay of interfacial mass transfer dynamics, microscopic dissolution behavior, and pressure drop in the aviation hydraulic oil–N2 system under landing conditions necessitates further elucidation. Thus, we investigated the interfacial mass transfer characteristics of the oil–gas mixing process using molecular dynamics (MD) for analyzing the dissolution mechanism of N2 in the aviation hydraulic oil system. The results show that as system pressure and temperature increase, the degree of oil–gas mixing intensifies. Under conditions of 373 K, 35 MPa and 433 K, 20 MPa, the diffusion coefficient, interfacial thickness, and system energy reach their maximum values. An increase in system pressure facilitates the occurrence of oil–gas mixing until the interface disappears at the minimum miscibility pressure (MMP), with the obtained MMP value being 107 MPa. Finally, the solubility of N2 molecules in aviation hydraulic oil under different conditions was statistically analyzed, which is identified as the root cause of the pressure drop in the shock absorber’s gas chamber. This study innovatively applies molecular dynamics simulations to unveil, for the first time, the dissolution mechanism of N2 in aviation hydraulic oil at the molecular scale, overcoming experimental limitations in observing extreme pressure–temperature conditions. This research elucidates the behavior of aviation hydraulic oil and N2 under different thermodynamic conditions, making it easier to capture the patterns of phenomena that are difficult to observe in extreme environments. The research findings not only enhance the microscopic understanding of oil–gas mixing within the sh

关键词： molecular dynamics simulation oil–gas miscibility N dissolved interface characteristic microscopic mechanism

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Research Progress on Microstructure Characterization of Silicon Carbide Fibers

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Journal of Physics: Conference Series 2021年第1期2101卷

作者： Xingjian Zhang Zixi Cai Jinjuan Fan Changkui Liu Jinfa Ye AECC Beijing Institute of Aeronautical Materials Aviation Key Laboratory of Science and Technology on Materials Testing and Evaluation Beijing 100095 China Northwestern Polytechnical University Queen Mary University of London Engineering School NPU Xi'an 710129 China Fujian LEADASIA New Material Limited Company Quanzhou 362000 Fujian China

Ceramic matrix composites have excellent properties such as high temperature resistance and oxidation resistance, and have good application prospects in the hot end parts of engines. In ceramic matrix composites, the microstructure composition of silicon carbide fibers determines their macroscopic properties. Therefore, this article takes silicon carbide fiber as the research object, summarizes the existing SiC fibers structure, composition, and morphology characterization methods, compares the development and advantages and disadvantages of XRD, SEM, TEM and other testing equipment analysis, and proposes The problems of sample preparation, surface defects and internal structure changes in the microstructure characterization of silicon carbide fibers are discussed, which provides a reference for the preparation of high-performance SiC fibers and the improvement of their characterization work.

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Analysis of the effect of fretting wear on key structural components of TB6 titanium alloy with actual failure cases

Analysis of the effect of fretting wear on key structural co...

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2018年先进电子材料、计算机与材料工程国际学术会议（AEMCME 2018）

作者： Huanping Kong Changkui Liu AECC Beijing Institute of Aeronautical Materials Beijing Key Laboratory of Aeronautical Materials Testing and Evaluation Aviation Key Laboratory of Science and Technology on Aeronautical Materials Testing and Evaluation

ISBN: (纸本)9781510874466

关键词： Analysis of the effect of fretting wear on key structural components of TB6 titanium alloy with actual failure cases

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