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Far East Forum on Nondestructive evaluation/testing: New technology & Application (FENDT)

作者： Zheng-Xiao Sha Tie Gang Jing Liang Bo Han AECC Beijing Institute of Aeronautical Materials Beijing China State Key Laboratory of Advanced Welding and Joining Harbin Institute of Technology Harbin China Beijing Key Laboratory of Aeronautical Materials Testing and Evaluation Beijing China Key Laboratory of Science and Technology on Aeronautical Materials Testing and Evaluation Aero engine corporation of China Beijing China

ISBN: (数字)9781665440820

ISBN: (纸本)9781665440837

Welded dual-alloy blisks have found more and more applications in aeroengines for their excellent high temperature performance. However, defects may develop within the bonding interface and threat the safety of the engine. In this paper, the ultrasonic testing of the bonding interface was investigated in the dual-alloy blisk with a small bore. Aided by a 90 degrees mirror, the longitudinal wave was introduced to the interface. Simulations and theoretical analyses were performed to explain the propagating behavior of the sound beam upon the strongly curved surface. It was observed when the focus of the probe approaches a certain point, the beam distortion was compensated under `acoustic lens effect'. The cylindrical focused probe was found to give better performance than flat probes and spherical focused probes in terms of sensitivity and resolution. The experiments on a mock-up sample showed that φ0.8mm FBH and Φ0.4mm SDH at the bonding interface were detectable with a 15MHz cylindrical focused probe.

关键词： Synchronous digital hierarchy Acoustics Acoustic beams Mirrors Probes Bonding testing

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Corrigendum to “Fatigue behavior of 2.5D woven composites based on the first-order bending vibration tests” [Compos. Struct. 284 (2022) 115218]

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Composite Structures 2025年 352卷

作者： Yana Wang Yu Gong Qin Zhang Yuhuai He Zhanfang Liu Ning Hu Aeronautical Material Testing Research Center AECC Beijing Institute of Aeronautical Materials Beijing 100095 China Beijing Key Laboratory of Aeronautical Material Testing and Evaluation Beijing 100095 China Key Laboratory of Aeronautical Material Testing and Evaluation Aero Engine Corporation of China Beijing 100095 China State Key Laboratory of Coal Mine Disaster Dynamics and Control Chongqing University Chongqing 400044 China College of Aerospace Engineering Chongqing University Chongqing 400044 China State Key Laboratory of Automotive Simulation and Control Jilin University Changchun 130022 China School of Mechanical Engineering Hebei University of Technology Tianjin 300401 China

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Effect of cold expansion on fatigue life of anodized Al alloy 2

Effect of cold expansion on fatigue life of anodized Al allo...

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2nd International Symposium on Application of materials science and Energy materials, SAMSE 2018

作者： Li, Nan Li, Haitao Liu, Hongtao Liu, Changkui 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

Anodizing treatment can improve corrosion resistance of aluminum alloy but decrease the fatigue life significantly. Introducing cold expansion before anodizing can increase the fatigue life of the specimen with open-hole structure by 2582% than the anodized one. Scanning electron microscopy (SEM) was employed for microstructure and fracture surface observation. Residual stress distribution near the sample hole edge was measured to elucidate the strengthening mechanism. The results revealed that although anodizing treatment decreases the surface integrity, the cold expansion is an effective method to improve the open-hole structure specimen remarkably. © 2019 Published under licence by IOP Publishing Ltd.

关键词： Corrosion resistance

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A Ply-By-Ply Discretized 2D FEA Approach with the Integrated XFEM-CE Strategy for Predicting Multiple Failures in Laminated Composite Structures

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Computer Modeling in Engineering & sciences 2019年第7期120卷 215-234页

作者： Yana Wang Ruodi Jia Fengrui Liu School of Astronautics Beihang UniversityBeijing100191China Aeronautical Material Testing Research Center AECC Beijing Institute of Aeronautical MaterialsBeijing100095China Beijing Key Laboratory of Aeronautical Material Testing and Evaluation Beijing100095China Key Laboratory of Aeronautical Material Testing and Evaluation Aero Engine Corporation of ChinaBeijing100095China Key Laboratory of Spacecraft Design Optimization and Dynamic Simulation Technologies Minisitry of EducationBeihang UniversityBeijing100191China State Key Laboratory for Strength and Vibration of Mechanical Structures Xi’an Jiaotong UniversityXi’an710049China.

Delamination and matrix cracking are two common failure mechanisms in composite structures,and are usually coupled with each other,leading to multiple failures *** paper proposed a fast damage prediction methodology for composite laminated structures based on the ply-by-ply 2D(two dimensional)FE model of composite laminates in the transverse *** layer-wise 2D FE model was firstly used in conjunction with the integrated XFEM/CE strategy,which simulated the interface delamination with cohesive elements and the intra-ply matrix crack with XFEM(extended finite element method).To realize ply-by-ply 2D FE(finite element)modeling of composite laminates,two 2D material models were developed based on the plane stress assumption and plane strain assumption,respectively.A general crack propagation scheme was developed in the framework of the integrated XFEM-CE *** the 2D material model based on the plane strain assumption,a ply-by-ply discretized 2D FEA procedure was conducted for an out-of-plane composite Pi joint under the static tensile *** predicted load-displacement response and damage evolution process showed good agreement with the experimental results,which verified the proposed approach.

关键词： Composites laminate strength finite element analysis

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Failure analysis of sensor diaphragm cracking

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Journal of Physics: Conference Series 2021年第1期1907卷

作者： Kong Huan-ping Liu De-lin Liu Chang-kui AECC Beijing Institute of Aeronautical Materials Beijing China Beijing Key Laboratory of Aeronautical Materials Testing and Evaluation Beijing China Key Laboratory of Science and Technology on Aeronautical Materials Testing 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

The sensor diaphragm cracked during the test project. Through macro and micro morphology observation, metallographic examination and hardness test, the diaphragm failure properties and reasons were determined. The results showed that the failure nature of the faulted diaphragm was bidirectional bending fatigue cracking. 1# crack failure was related to the greater bending stress borne at the bottom of the outermost corrugation. 2# crack failure was related to the greater stress borne by the root at the boundary between the outermost corrugation and the outer edge, the appearance of grain boundaries caused by the pickling process promoted the initiation and propagation of 2# crack.

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Deformation and damage behaviors of as-cast TiAl-Nb alloy during creep

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Progress in Natural science:materials International 2018年第5期28卷 618-625页

作者： Shunke Zhang Sugui Tian Xiaoxia Lv Huichen Yu Ning Tian Zehui Jiao Guoqi Zhao Deyuan Li Guizhou University of Engineering Science Shenyang University of Technology AECC Key Laboratory of Science and Technology on Materials Testing and Evaluation National Key Laboratory of Science and Technology on Advanced High Temperature Structure Materials AECC Beijing Institute of Aeronautical Materials

By means of creep properties measurement and microstructure observation,the deformation and damage behavior of an as-cast TiAl-Nb alloy during creep at temperature near 750°C were *** results showed that the microstructure of the alloy consisted of lamellarγ/α;phase,and the boundaries consisted ofγphase located in between lamellarγ/α;phases with different *** the latter stage of creep,the dislocation networks appeared in the interfaces of lamellarγ/α;phases due to the coarsening of them,which made the coherent interface transforming into the semi-coherent one for reducing its adhesive *** deformation mechanism of the alloy during creep was twinning and dislocations slipping within lamellarγ/α;*** the later period of creep,significant amount of dislocations plied up in the interfaces of lamellarγ/α;phases,which may cause the stress concentration to promote the initiation and propagation of the cracks along the lamellarγ/α;interfaces perpendicular to the stress ***,some cracks on the various cross-sections were connected by tearing edge along the direction of maximum shear stress,up to the creep fracture,which is considered to be the damage and fracture mechanism of alloy during creep at 750°C.

关键词： TiAl-Nb alloy Creep Dislocation network Deformation mechanism Fracture mechanism

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Influence of Inclusions' Position on Stress Distribution of Inclusion-matrix Interface

Influence of Inclusions' Position on Stress Distribution of ...

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作者： Zhao Kai Wang Tian-yu AECC Beijing Institute of Aeronautical Materials Beijing Key Laboratory of Aeronautical Materials Testing and Evaluation Key Laboratory of Science and Technology on Aeronautical Materials Testing and Evaluation Aero engine corporation of China Aviation Key Laboratory of Science and Technology on Materials Testing and Evaluation

In this paper, the influence of inclusions' position on stress & strain distribution was researched when inclusions were same size and shape. The finite element method was used to study the position effect of inclusions in the FGH95 P/M superalloys. The shape of inclusions was simplified rotundity in the model. The influence of inclusions which was on the surface, in the sub-surface and in the basic material on stress & strain distribution was studied. There were two cases, the inclusion connected basic material tightly and there was a hole between the inclusion and the basic material. The change rule of interfacial stress & strain distribution caused by the variation of inclusions' position was given.

关键词： Position on Stress Distribution of Inclusion-matrix Interface Influence of Inclusions

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Study of the Residual Stress in 2A97 Al-Li Alloy Using Different Methods

Study of the Residual Stress in 2A97 Al-Li Alloy Using Diffe...

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第二届材料科学应用与能源材料国际研讨会

作者： Xi Wang 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 Materials Testing and Evaluation Key Laboratory of Aeronautical Materials Testing and Evaluation Aero Engine Corporation of China

The contour method and X-ray diffraction have been used to measure the quenching stress in 2 A97 Al-Li *** surface stresses were measured by X-ray ***,the 2-D distribution of stresses have been given by the contour *** differences between the two methods can be more than 100 *** addition,finite element model which is suitable for evaluation of residual stresses in this material was *** is very good correlation between the contour method and finite element model(FEM).The differences are less than 50 *** model has high precision to forecast the residual stress in 2 A97 Al-Li alloy.

关键词： Study of the Residual Stress in 2A97 Al-Li Alloy Using Different Methods Alloy

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Indication Analysis of Magnetic Particle testing on PH13-8Mo Precipitation Hardening Stainless Steel

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IOP Conference Series: Earth and Environmental science 2021年第1期772卷

作者： Ning Luo Shuzhi Wang Guanghua Liu Beijing Key Laboratory of Aeronautical Materials Testing and Evaluation Beijing China AECC Beijing Institute of Aeronautical Materials Beijing China

The abnormity indication which is detected using magnetic particle testing process of PH13-8Mo precipitation hardening stainless steel was analyzed, combine with the microstructure observation. The reason for the magnetic testing indication has been determined. Inhomogeneous microstructure is the main factor which causes the abnormal indication. The results provide an important basis for indication determinant in the magnetic particle testing process of martensitic precipitation hardening stainless steel.

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Influence of Quasi-Beta Heat Treatment on Acoustic Behaviors of Ultrasonic Inspection of TC4-DT Alloy

Influence of Quasi-Beta Heat Treatment on Acoustic Behaviors...

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Far East Forum on Nondestructive evaluation/testing: New technology & Application (FENDT)

作者： Xiang-Xi Gao Su-Jun Wu Chun-Hu Tao School of Materials Science and Engineering Beihang University (BUAA) Beijing PR China Aviation Key Laboratory of Science and Technology on Aeronautical Materials Testing and Evaluation Beijing PR China

ISBN: (数字)9781665440820

ISBN: (纸本)9781665440837

The microstructure and microtexture of TC4-DT alloy before and after quasi-β heat treatment are investigated, as well as the influence on the acoustic behaviors of ultrasonic inspection. C-scan ultrasonic images are obtained to investigate the evolution of microstructure confirmed by metallography and electron backscatter diffraction (EBSD) analysis. Noise level and signal-to-noise ratio (SNR) of ultrasonic inspection are also quantitatively verified. The results show that when TC4-DT alloy undergoes quasi-β heat treatment, attenuation and scattering of acoustic energy is significantly different. During this process, the scattering mechanism of acoustic changes from Rayleigh scattering to Phase scattering, which is mainly controlled by the grain size. Under the same scattering mechanism with the uniform average grain size, however, the regions of a-phase crystallites with a certain orientation contribute to the scattering of the acoustic wave. This finding is helpful for estimating ultrasonic inspection ability of large components.

关键词： Grain size Heat treatment Scattering Metals Inspection Microstructure Signal to noise ratio

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