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2023 4th International Conference on Mechanical Engineering and materials, ICMEM 2023

作者： You, Long Liu, Changkui Chen, Hehe Fan, Hao AECC Beijing Institute of Aeronautical Materials Key Laboratory of Aeronautical Materials Testing and Evaluation Aero Engine Corporation of China Beijing100095 China College of Materials Science and Engineering Nanchang Hangkong University Nanchang330063 China

Loosening of bolted joint structure is a critical failure mode mainly caused by the slippage and friction behaviours on the thread and bearing surfaces. Domestic and foreign scholars have conducted a series of studies on the loosening mechanism and anti-loosening methods of bolted joint structures;however, there are fewer summaries on the influencing factors of loosening of bolted joint structures. This paper takes the phenomenon of loosening of bolted joint structure as the research object, summarizes the research method of loosening of bolt joint structure and the influencing factors, and summarizes the influencing law of loosening of bolted joint structure in four aspects, namely, preload force, external load factors, structural factors, and operating temperature, to provide references for the design of anti-loosening of bolted joint structure. © 2024 Institute of Physics Publishing. All rights reserved.

关键词： Bolted joints

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Effect of Different Skew Angle on Tensile Fracture Behavior of SiC Fiber Monofilament 7

Effect of Different Skew Angle on Tensile Fracture Behavior ...

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2024 7th International Conference on Mechanical, Electrical and Material Application, MEMA 2024

作者： Zhang, Xingjian Fan, Jinjuan Liu, Changkui Ye, Jinfa Peng, Ruiqi AECC Beijing Institute of Aeronautical Materials Aviation Key Laboratory of Science and Technology on Materials Testing and Evaluation Beijing100095 China Fujian LEADASIA New Material Limited Company Fujian Quanzhou362000 China

In fiber reinforced composites (FRP), silicon carbide fiber is indispensable. Its mechanical properties determine the performance of ceramic matrix composites. Therefore, the tensile and fracture behavior of silicon carbide fiber monofilaments should be studied in depth. In order to make the test results of fiber properties more accurate, this paper takes SiC fiber monofilament as the research object, carries out tensile tests at different deflection angles, and carries out WEIBULL statistical analysis and comparison of the data. The microscopic morphology of the tensile fracture of each single fiber was observed by SEM, and the change rule of the mechanical properties and fracture behavior of the fiber with the deflection angle was summarized, and whether the slight deflection affected the test results was explored. The results showed that: (1) The mechanical properties of SiC fiber monofilament decreased gradually with the increase of deflection angle, and the extent of decline gradually increased. (2) With the increase of deflection angle, the proportion of stepped fracture gradually increases, and that of flat fracture gradually decreases. © Published under licence by IOP Publishing Ltd.

关键词： Fracture

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Detection methods and bearing failure characteristics analysis related to grinding burns 2

Detection methods and bearing failure characteristics analys...

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2nd International Conference on Frontier materials, ICFM 2023

作者： Hou, Xue Qin Liu, Yong Bao Liu, Yu Liu, Chang Kui Zhang, Zheng Hutao, Chun Wei, Xun Kai AECC Beijing Institute of Aeronautical Materials Beijing100095 China AVIC Failure Analysis Center Beijing100095 China Beijing Key Laboratory of Aeronautical Materials Testing and Evaluation Beijing100095 China Key Laboratory of Science and Technology on Aeronautical Materials Testing and Evaluation Aeroengine Corporation of China Beijing100095 China School of Material Science and Engineering Beihang University Beijing100191 China AECC Harbin Bearing Co. Ltd. Harbin150025 China Beijing Aeronautical Technology Research Center Beijing100024 China

Grinding burn is one of the bearing failure causes for components. In order to quickly confirm that grinding burn is the cause of bearing failure, detection methods for the grinding burns and characteristics of bearing failure caused by grinding burns have been studied in this paper. The results show that cold acid pickling examination, microhardness test and Barkhausen noise analysis can be used in the detection of heavy grinding burns but have several disadvantages to hinder their application on the detection of slight grinding burns. A grinding burn detection procedure is recommended for the analysis of bearing failure induced by grinding burn. It has been found that the modes of bearing failure induced by grinding burns were contact fatigue spalling developed from the contact fatigue crack, the propagation mechanism of the contact fatigue crack was obtained. And the unique phenomenon of fracture or fragmentation with cracks distributed in the origin or surrounding the spalling pit of the grinding burn layer was also obtained. Based on the above results the future work on detection methods and influence on bearing failure mechanism and life of grinding burn are proposed. © 2023 Published under licence by IOP Publishing Ltd.

关键词： Spalling

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Creep behavior and effect factors of a TiAl–Nb alloy at high temperature

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Progress in Natural science:materials International 2021年第3期31卷 477-485页

作者： Shunke Zhang Sugui Tian Gengyu Li Ning Tian Fangwei Jin Huichen Yu Xiaoxia Lv Guangyan Wang Deyuan Li Shenyang University of Technology Guizhou University of Engineering Science Beijing Key Laboratory of Aeronautical Materials Testing and Evaluation Science and Technology on Advanced High Temperature Structural Materials Laboratory AVIC Beijing Institute of Aeronautical Materials

The effect of solution treatment on the microstructure and creep properties of forged TiAl-Nb alloys was *** results showed that the microstructure of forged alloy mainly consisted of γ/α2lamellar colonies and fine equiaxed recrystallized γ/α*** the solution treatment the microstructure of the alloy transformed into a fully lamellar structure due to the lamellar colonies growth by consuming equiaxed *** with the forged alloy the creep life of the solution treated alloy at 800℃/220 MPa increased from 116 h to 339 *** better creep resistance may be attributed to the transform of fine equiaxed γ/α2grain to the lamellar colonies with serrated grain boundaries due to the solution *** deformation mechanism of the solution treated alloy during creep is considered to be dislocation slipping within the lamellar γ/α2phases,and the dislocation movement may be hindered by the γ/α2interface and the formation of dislocation *** interaction of the dislocations with the tangles may increase the resistance of the dislocation motion and hence improve the creep resistance of the *** was found that during the creep of the forged alloys the cracks mainly initiated at the equiaxed grain,and in the solution treated alloy the cracks initiated at the grain *** creep continued the cracks propagated and connected to each other,leading to the damage and rupture of the forged and solution treated alloys.

关键词： Forged TiAl–Nb alloy Solution treatment Microstructure Creep Deformation and damage

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Indium oxide buffer layer for perovskite/Si 4-terminal tandem solar cells with efficiency exceeding 30%

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Journal of Energy Chemistry 2025年第3期102卷 189-196页

作者： Liming Du Can Li Yuhui Jiang Fangfang Cao Chunmei Jia Zhi Wan Rui Meng Jishan Shi Chuanxiao Xiao Zhe Liu Zhen Li State Key Laboratory of Solidification Processing Center for Nano Energy MaterialsSchool of Materials Science and EngineeringNorthwestern Polytechnical University and Shaanxi Joint Laboratory of Graphene(NPU)Xi'an710072ShaanxiChina Ningbo Institute of Materials Technology and Engineering Chinese Academy of SciencesNingbo 315201ZhejiangChina Ningbo New Materials Testing and Evaluation Center Co. Ltd.Ningbo 315201ZhejiangChina

Perovskite/Si tandem solar cells(TSCs)present great potential to surpass the Shockley-Queisser limit of single-junction solar cells for further advancing the power conversion efficiency(PCE)of solar ***,the fabrication of TSCs usually encounters challenge of selecting suitable sputtering buffer layer(SBL)to prevent the bombardment during the transparent electrode ***,we introduce an indium oxide(In_(2)O_(3))buffer layer via e-beam deposition to fabricate semi-transparent perovskite solar cells(ST-PSCs).The optical transmittance and electrical conductivity of In_(2)O_(3)highly depend on the deposition *** deposition rate results in high ratio of metallic indium in the film,which causes severe parasitic absorption.A 20 nm-thick In_(2)O_(3)film deposited at lower rate demonstrated high conductivity,transmittance and robust protection during sputtering.A 1.68 eV ST-PSC incorporating this In_(2)O_(3)buffer layer exhibits a champion PCE of 20.20%,demonstrating the excellent optoelectronic and protective properties of In_(2)O_(3).When combined with a Si subcell,the 4-terminal TSC obtains a remarkable PCE of 30.04%,Importantly,the unencapsulated ST-PSC maintained 80%of initial PCE after 423 h of continuous light soaking in N_(2).This work has provided a facile and instrumental transparent SBL strategy for perovskite/Si TSCs.

关键词： E-beam deposition Sputtering Transparent electrode Perovskite solar cells In_(2)O_(3)

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Effect of Different Scanning Modes and Heat Treatment on Microstructure and Mechanical Properties of GH4169 Manufactured by Selective Laser Melting 5th

Effect of Different Scanning Modes and Heat Treatment on Mic...

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5th China Aviation science and technology Conference, 2021

作者： Zhou, Jingyi Wei, Zhenwei Tang, Siyi Zhao, Wenxia Guo, Shaoqing Wang, Jian Zhao, Zijun AECC Beijing Institute of Aeronautical Materials Beijing100095 China Beijing Key Laboratory of Aeronautical Materials Testing and Evaluation Beijing100095 China Key Laboratory of Aeronautical Materials Testing and Evaluation Aero Engine Corporation of China Beijing100095 China Aviation Key Laboratory of Science and Technology on Materials Testing and Evaluation Beijing100095 China Aero Engine Corporation of China Beijing100097 China

ISBN: (纸本)9789811674228

GH4169 superalloy was prepared by selective laser melting technique. The samples were obtained by scanning in a single direction per layer and scanning in a 90° direction per layer, respectively. The microstructure and precipitated phase were compared and analyzed by OM, SEM and EDS to investigate the non-equilibrium microstructure characteristics and the influence mechanism on mechanical properties of laser additive manufacturing materials of GH4169 under three heat treatment systems. The results show that in the X direction of laser scanning deposition, the tensile strength at room temperature of the material with the same scanning direction of each layer is 4.5% higher than that of the material with the scanning direction of 90°, and the reduction of area is 75.6% higher. After solution and aging treatment, δ phase was precipitated and Laves phase was partially dissolved, but the element segregation in the remelting zone between the cladding layers was not completely eliminated. Homogenization treatment at 1050 ℃ for 1h promotes uniform distribution of segregation elements in cladding layer, remelting layer and dendrite. After homogenization treatment at 1100 ℃ for 1h, Laves phase was fully redissolved, and δ phase and strengthening phase γ ‘ were precipitated again after solution and aging. After heat treatment, the tensile strength at room temperature of the samples prepared by the two laser scanning methods is basically the same in the X direction. © 2022, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Scanning

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Quality assessment of friction-stir-welded aluminum alloy welds via three-dimensional force signals

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Advances in Manufacturing 2024年第1期12卷 61-75页

作者： Ji-Hong Dong Yi-Ming Huang Jia-Lei Zhu Wei Guan Xu-Kai Ren Huan-Wei Yu Lei Cui Beijing Institute of Petrochemical Technology Beijing102617People’s Republic of China Beijing Academy of Safety Engineering and Technology Beijing102617People’s Republic of China AVIC Manufacturing Technology Institute Beijing100024People’s Republic of China Tianjin Key Laboratory of Advanced Joining Technology School of Materials Science and EngineeringTianjin UniversityTianjin300350People’s Republic of China Shaoxing Special Equipment Testing Institute Shaoxing Key Laboratory of Special Equipment Intelligent Testing and EvaluationShaoxing312071ZhejiangPeople’s Republic of China

An online detection technology must be developed for realizing the real-time control of friction stir *** this study,the three-dimensional force exerted on a material during friction stir welding was collected synchronously and the relationship between the forces and welding quality was *** results indicated that the fluctuation period of the traverse force was equal to that of the lateral force during the stable welding *** phase difference between two horizontal forces wasπ/*** values of the horizontal forces increased with welding speed,whereas their amplitudes remained the *** proposed force model showed that the traverse and lateral forces conformed to an elliptical curve,and this result was consistent with the behavior of the measured *** variational mode decomposition was used to process the plunge *** intrinsic mode function that represented the real fluctuation in the plunge force varied at the same frequency as the spindle rotational *** tunnel defects occurred,the fluctuation period features were consistent with those obtained during normal welding,whereas the ratio parameter defined in this study increased significantly.

关键词： Friction stir welding(FSW) Three-dimensional force model Variational mode decomposition Tunnel defect

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The Evolution Behaviors of Carbides in the Cobalt-Base Superalloy During the Long-Term Heat-Treatments

SSRN

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SSRN 2024年

作者： Teng, Chaoyi Liu, Changkui Liang, Daizong Zhang, Lihui Huang, Qiang AECC Beijing Institute of Aeronautical Materials Beijing100095 China Beijing Key Laboratory of Aeronautical Materials Testing and Evaluation Beijing China Key Laboratory of Aeronautical Materials Testing and Evaluation Aero Engine Corporation of China Beijing China Science and Technology on Advanced High Temperature Structural Materials Laboratory Beijing China

The carbides evolution behaviors in the equiaxed-crystal cast cobalt-base superalloy during the long-term heat-treatments were studied. The heat-treatment conditions were chosen referred to the real service conditions of the turbine vanes in aero-engines. The Type I M23C6-matrix and Type II M7C3-matrix eutectics were found in the as-cast alloy, but only M23C6-matrix eutectic was found in the heat-treated alloys. The new potential mechanism of the M7C3→M23C6 transformation is proposed. The M23C6-matrix eutectics went through the further decomposition, but large amounts of the lath-like secondary M23C6 formed during the heat-treatments. Regarding the MC carbides, the temperature and duration time of the heat-treatments had significant impacts on their morphologies. The new explanation for the serrations on the primary MC carbide edges after the heat-treatment is proposed. © 2024, The Authors. All rights reserved.

关键词： Eutectics

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Fracture Failure Analysis of Gear Teeth 6

Fracture Failure Analysis of Gear Teeth

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2021 6th International Conference on Applied Mechanics and Structural materials, AMSM 2021

作者： Liu, Chunjiang Ouyang, Kang Jiang, Tao Liu, Changkui AECC Beijing Institute of Aeronautical Materials Beijing100095 China Failure Analysis Center of Aviation Industry Corporation of China 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 Wuhu Machinery Plant Wuhu241007 China

Gears are important transmission components in the field of aviation industry. Failure cases such as fatigue fracture and fatigue spalling often occur due to poor conditions, and the status of teeth surface is usually one of the important elements for the failure cause analysis, but few have analyzed how the machining status of gear end surface affects the fracture failure. In this paper, one engagement failure of two gears was studied, and the failure phenomenon is as follows: all teeth of the driving gear fractured, two adjacent teeth of the driven gear fractured and several locations of teeth bottom cracked. According to the fracture morphology of the gear, it is judged that the driven gear fatigue-cracked firstly, and the fatigue zone is located at the lower end surface rather than the tooth bottom. Material structure, machining status of gear end surface, and the thickness of nitriding layer were inspected. In addition, the difference of the machining status between the lower and the upper end surface was analyzed. The results show that compared to the upper end surface, the lower end surface is smoother and the grinding amount is relatively larger. The residual stress tested by XRD shows that there is a residual compressive stress of about 84 MPa on the upper end surface and a residual tensile stress of about 238 MPa on the lower end surface. The tensile stress and the working stress cause the local stress level of the lower end surface of the gear to be higher than the fatigue strength, causing fatigue cracking from the lower end surface. © 2022 Institute of Physics Publishing. All rights reserved.

关键词： Tensile stress

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Fracture failure analysis of sensor combination pipes

Fracture failure analysis of sensor combination pipes

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2022 International Conference on Optoelectronic Information and Functional materials, OIFM 2022

作者： Huanping, Kong Changkui, Liu Delin, Liu Aecc Beijing Institute of Aeronautical Materials Beijing China Beijing Key Laboratory of Aeronautical Materials Testing and Evaluation Beijing China Key Lab. of Sci. and Technol. on Aero. Mat. Test. and Evaluation of Aero Engine Corporation of China Beijing China Aviation Key Laboratory of Science and Technology on Materials Testing and Evaluation Beijing China Aecc Failure Analysis Center Beijing China

ISBN: (数字)9781510655126

ISBN: (纸本)9781510655119

The sensor combination pipes fractured during operation. Through macro and micro morphology observation, energy spectrum analysis, metallographic examination and hardness test, the pipes failure properties and reasons were determined. The results showed that the failure property of dynamic pressure pipe was stress corrosion fracture, and the failure property of the static pressure pipe was corrosion fatigue cracking. The pipes failure was related to the absence of stress relief annealing, and mechanical damage on the pipe surface promoted static pressure pipe failure. © 2022 SPIE.

关键词： Corrosion fatigue

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