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9th International Symposium on Hydrogen Energy, Renewable Energy and Materials, HEREM 2023

作者： Shuai, Zheng Wei, Xu Xueqin, Hou Jian, Zhang Yanfei, Liu Jianwei, Xu Xuanning, Zhang Science and Technology On Advanced High Temperature Structural Materials Laboratory AECC Beijing Institute of Aeronautical Materials Beijing100095 China Beijing Key Laboratory of Aeronautical Materials Testing and Evaluation AECC Beijing Institute of Aeronautical Materials Beijing100095 China Aviation Key Laboratory of Science and Technology On Materials Testing and Evaluation Beijing100095 China AECC Sichuan Gas Turbine Establishment Chengdu610500 China

ISBN: (纸本)9789819736850

The investigation of the low cycle fatigue behavior of a first generation single crystal superalloy CMSX-6 were presented. Specimen of CMSX-6 alloy with standard heat treated were test by the fatigue testing machines. The study indicate the low cycle fatigue of CMSX-6 is about 965MPa at 770 °C, R = 0 with a cycle number of 106. Subjected to periodic loads, the dislocation movement in the alloy is restricted to a small part of the crystal plane at the stress concentration area and intensive local slip occurs, resulting in plastic deformation in the local area, and the straight shape of the specimen side became crooked. SEM observation indicate that the fatigue cracks initiate from the internal microporosity of the specimen, and the transient fracture is formed after the crack propagation. The oxidation in crack propagation zone is serious, and the fatigue bands are not visible. Shear dimples were found at the transient fault zone. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Single crystals

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A Method for Computer Generated Forces Behavior Modeling Based on Composability

A Method for Computer Generated Forces Behavior Modeling Bas...

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2014中国制导、导航与控制学术会议

作者： Bin Lu Guanghong Gong Advanced Simulation Technology Aviation Key Laboratory Beihang UniversityBeijing100191 China School of Automation Science and Electrical EngineeringBeihang UniversityBeijing100191 China

ISBN: (纸本)9781479946983

The requirement and characteristic in Computer Generated Forces behavior modeling were *** the design concept of American OneSAF system,a method for behavior modeling based on composability was proposed and the formalization description of behavior was ***,the Behavior Modeling Composer Tool was developed based on this method to assist the behavior ***,an application of this method was *** preliminary results show that this method can improve the modeling efficiency and increase the reuse rate of models.

关键词： behavioural sciences computing military computing American OneSAF system behavior modeling composer tool composability computer generated forces behavior modeling Assembly Atmospheric modeling Computational modeling Computers Data models Databases Educational institutions

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Research on Multi-Resolution Modeling of DEM Based on Different Wavelet Basis

Research on Multi-Resolution Modeling of DEM Based on Differ...

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2014中国制导、导航与控制学术会议

作者： Feng Zhou Guanghong Gong Peng Ding Wen Shi Xiaole Ma Advanced Simulation Technology Aviation Key Laboratory Beihang UniversityBeijing100191 China School of Automation Science and Electrical EngineeringBeihang UniversityBeijing100191 China

ISBN: (纸本)9781479946983

According to the property of DEM,on the base of multi-resolution analysis algorithm this paper presents a method for multi-resolution modeling based on wavelet *** the paper analyzes the principles for choosing the fittest wavelet function and boundary extension *** paper also provide a way to choose the best resolution depended on the viewpoint and the viewing angle The paper suggests to control the threshold to build data *** some experiments,this method is proved to be efficient and robustness.

关键词： digital elevation models geophysical image processing image resolution wavelet transforms DEM multiresolution modeling boundary extension mode data pyramid digital elevation model multiresolution analysis algorithm wavelet analysis wavelet function Educational institutions Image reconstruction Laboratories Signal resolution Vectors Wavelet analysis Wavelet transforms

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粉末床熔融的多材料铺粉过程中粉末扩散的数值研究

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Acta Mechanica Sinica 2023年第1期39卷 23-29页

作者：王林李二垒周宗彦张百成余艾冰 ARC Hub for Computational Particle Technology Department of Chemical & Biological Engineering Monash University Clayton VIC 3800 Australia Delft University of Technology Stevinweg 1 2628 CN Delft The Netherlands Jiangxi Provincial Key Laboratory for Simulation and Modelling of Particulate Systems Jiangxi University of Science and Technology Nanchang 330013 China Beijing Advanced Innovation Center Materials Genome Engineering Advanced Material & Technology Institute University of Science and Technology Beijing Beijing 100083 China

粉末床熔融增材制造技术已应用于功能梯度材料的制造.文献中报道了一种材料成分沿垂直于粉末铺粉方向变化的新设计.基于此设计,本工作采用离散单元数值模拟研究了两种密度差异较大的金属粉末在铺粉过程中颗粒的偏析情况.结果发现,在铺... 详细信息

粉末床熔融增材制造技术已应用于功能梯度材料的制造.文献中报道了一种材料成分沿垂直于粉末铺粉方向变化的新设计.基于此设计,本工作采用离散单元数值模拟研究了两种密度差异较大的金属粉末在铺粉过程中颗粒的偏析情况.结果发现,在铺粉过程中,较大密度粉末(重颗粒)一侧的铺粉量小于较小密度粉末(轻颗粒)的一侧的铺粉量.这种现象表明重颗粒从粉末密度大的一侧向粉末密度较小的一侧扩散.这种扩散受铺粉速度影响较大,铺粉速度越快,扩散越明显.但粉末层厚度对扩散影响不大.结果还表明,重颗粒与轻颗粒间的粒径差异影响扩散较大,减小重颗粒的粒径可能是控制颗粒偏析的一种方案.

关键词：材料成分颗粒偏析功能梯度材料离散单元金属粉末密度差异增材制造技术扩散影响

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Mechanism of CFF/PPS interface strength enhancement via infrared heating desizing-assisted plasma treatment

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Polymer Composites 2025年

作者： Li, Yue Ruan, Xuran Yang, Yang Li, Yaoshan Yan, Tianwen Gao, Yu Zhou, Jianfeng Cao, Huajun Dong, Yan Zhu, Shu State Key Laboratory of Advanced Fiber Materials Shanghai Collaborative Innovation Center of High-Performance Fibers and Composites (Province-Ministry Joint) Key Laboratory of High-Performance Fibers & Products Ministry of Education Center for Civil Aviation Composites Donghua University Shanghai China Key Laboratory of Shanghai City for Lightweight Composites College of Materials Science and Engineering Donghua University Shanghai China School of Chemistry and Chemical Engineering Frontiers Science Center for Transformative Molecules Shanghai Jiao Tong University Shanghai China Shanghai Aircraft Manufacturing Company Shanghai China College of Mechanical and Vehicle Engineering Chongqing University Chongqing China Zhejiang Reach Green Environmental Technology Co. Ltd. Wenzhou China

This study introduced a novel infrared heating-assisted plasma surface treatment method to enhance the performance of carbon fiber fabric-reinforced polyphenylene sulfide (CFF/PPS) composite interfaces. This method leveraged infrared radiation, which was directly absorbed by the sizing agent and fiber, thereby minimizing heat loss and increasing the mechanical locking points. The effects of infrared temperature, duration, plasma processing power, and scanning speed on the interface performance were systematically investigated to develop effective optimization strategies. Monofilament strength tests demonstrated that infrared heating significantly improved the removal of the sizing agent. Additionally, auxiliary plasma treatment enhanced the surface properties of the carbon fibers after infrared heating. The interfacial shear strength (IFSS) of the optimized CFF/PPS reached 84.82 MPa, a 30.5% improvement over infrared desizing alone. Following the optimized process, the bending strength, modulus, and interlaminar shear strength of the CFF/PPS laminates were increased by 81.9%, 42.9%, and 77.6%, respectively, compared with those of the untreated samples. These findings indicated that infrared heating-assisted plasma treatment effectively removed the epoxy sizing agent and significantly improved the interface properties, offering a practical and efficient solution for industrial CFF/PPS interface performance enhancement. Highlights: Infrared–plasma treatment boosts CFF/PPS interfacial strength by 30.5%. Optimized process enhances bending strength (81.9%) and modulus (42.9%). Infrared–plasma treatment can improve fiber desizing efficiency significantly. © 2025 Society of Plastics Engineers.

关键词： carbon fiber fabric reinforced polyphenylene sulfide composites (CFF/PPS) infrared heating desizing interface property plasma surface treatment

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Experimental Evaluation of Fatigue Behaviors and Tensile Properties of Selective Laser Melted K536 Alloy at Elevated Temperatures

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Procedia Structural Integrity 2017年 7卷 84-91页

作者： R.D. Xu Z.H. Jiao H.C. Yu Aviation Key Laboratory of Science and Technology on Materials Testing and Evaluation Science and Technology on Advanced High Temperature Structrual Materials Laboratory Beijing Key Laborotory of Aeronautical Materials Testing and Evaluation Beijing Institute of Aeronautical Materials Beijing 100095 China

Additive-manufacturing techniques show more and more utilization potentialities in today’s aviation industry. In order to ensure safe operation of additive-manufactured parts, it is important to have their mechanical properties well-characterized and assessed. In this study, elevated temperature fatigue behaviours and tensile properties of a selective laser melting (SLM) fabricated K536 alloy are investigated for horizontal and vertical building orientation, respectively. A series of tensile tests at 20 ºC ~700 ºC temperature range and stress-controlled fatigue tests at 400ºC and 600ºC are conducted. Effects of building orientation and temperature on tensile and fatigue behaviours are analysed. Scanning Electron Microscopy (SEM) is used to examine the fracture surfaces of fatigue specimens to qualify the failure mechanism and crack initiation sites. K536 parts manufactured via SLM are shown to exhibit anisotropic tensile properties at different testing temperatures. Anisotropy of fatigue properties is not obvious at 400ºC and 600ºC. Cracks are likely to initiate at the surface sliding or subsurface crystallographic plane of fatigue specimens in middle life regime and at subsurface or central zone crystallographic plane in longer life regime. In shorter life regime, cracks are easy to initiate at un-melted zones of fatigue specimens.

关键词： Additive manufacturing Selective Laser Melting K536 fatigue behavior tensile

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Evaluation on Tensile and Fatigue Crack Growth Performances of Ti6Al4V Alloy Produced by Selective Laser Melting

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Procedia Structural Integrity 2017年 7卷 124-132页

作者： Z.H. Jiao R.D. Xu H.C. Yu X.R. Wu Aviation Key Laboratory of Science and Technology on Materials Testing and Evaluation Science and Technology on Advanced High Temperature Structrual Materials Laboratory Beijing Key Laborotory of Aeronautical Materials Testing and Evaluation Beijing Institute of Aeronautical Materials Beijing 100095 China

Additive manufacturing (AM) technologies are increasing in importance for aerospace application, where the demand for a fundamental understanding and predictability of static and dynamic material properties are high. As the most widely used and studied alloy for this technology, Selective laser melting (SLM) produced Ti6Al4V alloy is evaluated on tensile and fatigue crack growth (FCG) performances at RT and 400℃. Conventionally manufactured Ti6Al4V alloys are concerned for comparison. Different orientations are considered to investigate the anisotropy of tensile and FCG behavior. The results show that, the tensile properties at RT and 400℃ are highly dependent on the specimen orientation relative to build direction. The FCG resistance is related to specimen orientation in the near threshold region but no relationship with specimen orientation in the steady growth stage at RT. The FCG resistance is much less influenced by specimen orientation at 400℃. The tensile strength at RT and 400℃ of SLM alloy reaches even exceeds the strength level of conventionally manufactured alloys such as forging, bar and casting. The steady stage FCG resistance under stress ratio of 0.1 of SLM alloy is also comparable to conventionally manufactured alloys. The SLM alloy shows higher FCG resistance under stress ratio of 0.1 than 0.5, but the d a /d N -△ K curves of the two stress ratios are very close to each other. The steady stage FCG rate at RT is slower than 400℃ in the lower △ K region and faster in the higher △ K region.

关键词： SLM tensile properties fatigur crack growth anisotropy elevated temperature

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Research on the estimation and reduction measures of antenna mode RCS of airborne phased array

Research on the estimation and reduction measures of antenna...

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International Symposium on Microwave, Antenna, Propagation and EMC Technologies for Wireless Communications (MAPE)

作者： Yun Liu Lizhi You Aviation key Laboratory of Science and Technology on Avionics Integrated Sensor System Simulation Radar and Avionics Institute of AVIC Wuxi China

ISBN: (纸本)9781424482658

In this paper, the scattering principium of airborne phased array antenna is discussed, and the antenna mode RCS of the two-dimensional array is estimated. Based on theoretical calculations, broadband matching, incline, manufacturing tolerances and other RCS reduction measures are researched. The results show that these stealth approaches have an obviously effect on the RCS reduction.

关键词： Arrays Scattering Reflector antennas Antenna arrays Antenna radiation patterns Radar antennas

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Investigation of tip-leakage-vortex breakdown and its role in rotating stall in a 1.5-stage low-speed axial-compressor 16

Investigation of tip-leakage-vortex breakdown and its role i...

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16th International Symposium on Transport Phenomena and Dynamics of Rotating Machinery, ISROMAC 2016

作者： He, Xiang Ma, Hongwei Wei, Wei National Key Laboratory of Science and Technology Aero-Engines Collaborative Innovation Center of Advanced Aero-Engine School of Energy and Power Engineering Beihang University Beijing100191 China China Aviation Powerplant Research Institute Zhuzhou412002 China

A whole-annulus unsteady numerical simulation is carried out to investigate the mechanism of the rotating stall in a 1.5-stage low-speed axial-compressor. By comparing the experimental and numerical results, the numerical results are validated. The numerical simulation captures the most features of the rotating stall of the 1.5-stage compressor observed from the experimental results. The unsteady bubble-like breakdown appears in the tip leakage vortex at the near stall condition. With the compressor throttling, the modal wave appears, increases in intensity and induces the part of the breakdown-vortex flow spilled over the adjacent blade leading-edge unsteadily, which form a spike. Consequently, the spikes emerge around the compressor annulus at the same time and the intensity and size of the spikes is increased rapidly during the inception period. At last, the spikes are merged into a large stall cell, which propagates around the annulus with 30% rotor speed. © Open Archives of the 16th International Symposium on Transport Phenomena and Dynamics of Rotating Machinery, ISROMAC 2016. All rights reserved.

关键词： Vortex flow

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Dual roles of hydroxyl radicals and effects of competition on ozonation kinetics of two phenazone-type pollutants

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Emerging Contaminants 2015年第1期1卷 2-7页

作者： Zhang, Siyu Zhao, Yue Yu, Gang Wang, Bin Huang, Jun Deng, Shubo State Key Joint Laboratory of Environment Simulation and Pollution Control School of Environment POPs Research Center Tsinghua University Beijing 100084 China Veolia Environment Joint Research Center for Advanced Technology Tsinghua University Beijing 100084 China Key Laboratory of Pollution Ecology and Environmental Engineering Institute of Applied Ecology Chinese Academy of Science Shenyang 110016 China

Ozonation has been proved to be a promising approach for eliminating emerging pollutants in wastewater. In previous studies, emerging pollutants including diverse pharmaceuticals were found to exhibit significantly different ozonation reactivity. However, how the structural differences of emerging pollutants determine ozonation reactivity and mechanisms are still ambiguous. In this work, ozonation of dimethylaminophenazone (DMP) and acetylaminophenazone (AAA) with the same parent structure of phenazone but different substitution groups was investigated, in order to probe influencing mechanisms of structural differences on ozonation reactivity. Results show that DMP reacts with ozone and HO[rad] almost 2 and 1 order of magnitude faster than AAA, respectively. At pH 8, HO[rad] accelerates ozonation of DMP, but decreases ozonation of AAA. Competition simultaneously decreases degradation rate of the two phenazones, but effects on AAA are more significant than that on DMP. According to theoretical calculation results, differences in ozonation reactivity and mechanisms of the two phenazones can be mainly attributed to different substitution groups. The dimethylamino group in the structure of DMP increases the ozonation reactivity of phenazone by increasing reaction orbital energies and altering reaction sites, while the acetylamino group in the structure of AAA decreases the reaction orbital energy and therefore lowers the reactivity. © 2015 The Authors

关键词： Competition Hydroxyl radical Ozonation Phenazone-type pollutants Substitution groups

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