中国科学院机构知识库网格系统: 检索

The nature and the mechanism of crack initiation and early growth for very-high-cycle fatigue of metallic materials - An overview 会议论文 OAI收割
Catania, ITALY, JUN 20-24, 2016
作者: Hong YS(洪友士); Sun CQ(孙成奇); Hong, YS (reprint author), Chinese Acad Sci, Inst Mech, LNM, Beijing 100190, Peoples R China.

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High-strength Steels Chromium-bearing Steel Regime N-greater-than-10(7) Cycles Severe Plastic-deformation Ion Mass-spectrometry Long-life Fatigue Very-high-cycle Fatigue Fatigue Crack Initiation Fine-granular-area Nanograins High-strength Steels Titanium Alloyss-n Curve Ti-6al-4v Alloy Propagation Mechanism Ultrasonic Frequency

The formation mechanism of characteristic region at crack initiation for very-high-cycle fatigue of high-strength steels 会议论文 OAI收割
3rd International Conference on Characterisation of Crack Tip Fields, Urbino, ITALY, APR 20-22, 2015
作者: Hong YS(洪友士); Liu XL(刘小龙); Lei ZQ(雷铮强); Sun CQ(孙成奇)

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Very-high-cycle fatigue Fatigue crack initiation Fine-granular-area Nanograins High-strength steels CHROMIUM-BEARING STEEL LONG-LIFE FATIGUE N-GREATER-THAN-10(7) CYCLES RESIDUAL-STRESSES VHCF-REGIME BEHAVIOR INCLUSIONS PROPAGATION DAMAGE SIZE

Faceted crack initiation characteristics for high-cycle and very-high-cycle fatigue of a titanium alloy under different stress ratios 会议论文 OAI收割
5th International Conference on Crack Paths (CP), Ferrara, ITALY, SEP, 2015
作者: Liu XL(刘小龙); Sun CQ(孙成奇); Hong YS(洪友士)

收藏 | 浏览/下载：21/0 | 提交时间：2017/05/12

Ti-6Al-4V alloy Faceted crack initiation Very-high-cycle fatigue Stress ratio Cluster of primary alpha grains COMPETING FAILURE MODES POISSON DEFECT STATISTICS TI-6AL-4V ALLOY STRUCTURAL-MATERIALS MEAN STRESS STRENGTH MICROSTRUCTURE BEHAVIOR DUALITY SURFACE

Surface features of Zr-based and Ti-based metallic glasses by ion irradiation 会议论文 OAI收割
17th International Conference on Surface Modification of Materials by Ion Beams (SMMIB), Harbin, PEOPLES R CHINA, SEP 13-17, 2011
作者: Hu Z(胡铮); Xing JS(邢建硕); Lu T(卢通); Hu Z(胡铮); Wei BC(魏炳忱)

收藏 | 浏览/下载：56/0 | 提交时间：2013/02/26

Metallic glasses Ion irradiation Surface features Irradiation damage AMORPHOUS SOLIDS PLASTIC-FLOW BOMBARDMENT IMPACTS ALLOYS DAMAGE MODEL GOLD Grain boundaries Ion bombardment Irradiation Radiation Surfaces Zirconium Bulk metallic glass Crystalline structure Damage morphology Disordered structures Fluences Formation mechanism High strength Ions irradiation Irradiated surface Irradiation Damage Irradiation effect Micrometer scale Structural transitions Superior resistance

Structural design of large aperture rectangular mirror for space telescope (EI CONFERENCE) 会议论文 OAI收割
2nd International Conference on Civil Engineering and Transportation, ICCET 2012, October 27, 2012 - October 28, 2012, Guilin, China
作者: Li Z.; Li Z.

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Structural design of large aperture mirror is one of the key technologies for space telescope development. To meet the requirements of high stiffness strength and thermal dimensional stability some factors such as support scheme materials selection lightweight design and flexible support design were taken into account. The three supports location of the mirror was determined according to the modal analytical solution. By adjusting the parameters of flexure hinge influences of gravity assembly stress and thermal stress on the mirror were reduced obviously. Finite element analysis (FEA) results indicate that the surface accuracy reach to rms10.2nm and 10.8nm under the gravity along optical axis direction and 5C uniform temperature rise respectively the fundamental frequency of the mirror component is 268Hz. Dynamics test shows that the first order natural frequency is 256Hz which shows an error less than 5% compared to FEA results. (2013) Trans Tech Publications Switzerland.

Image mosaic technique based on the information of edge (EI CONFERENCE) 会议论文 OAI收割
2012 3rd International Conference on Digital Manufacturing and Automation, ICDMA 2012, July 31, 2012 - August 2, 2012, Guilin, Guangxi, China
作者: Wang Y.-Q.

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Image mosaic is an important branch in the field of image processing. This paper designs and realizes an image mosaic technique based on the information of edge. The technology is suitable for engineering application. First of all two images of the adjoining frames are processed by convolution operation get the edge images. And then we cut edge image into pieces and compute their spatial frequency. According to the value of the spatial frequency select reasonable registration model group. We compute correlation strength and the value of movement offset which are the model group and the current frame edge image. We can complete image mosaic by them. We use video sequence which of the resolution is 1024 * 768 do the experiment. The results show that the method has good effect and strong adaptability. Algorithm is high efficiency which running time is 24 ms. It is suitable for real-time processing requirements of the application. This method is an effective mosaic technique which is suitable for engineering application. 2012 IEEE.

Study on ultra-light secondary baffle for coaxial two-mirror telescope (EI CONFERENCE) 会议论文 OAI收割
2012 9th IEEE International Conference on Mechatronics and Automation, ICMA 2012, August 5, 2012 - August 8, 2012, Chengdu, China
作者: Zhang L.; Zhang L.

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The coaxial two-mirror telescope consists of two mirrors facing each other. Classical two-mirror arrangements are Gregorian and Cassegrain. These systems are usually applied to space telescopes and often have optical baffles to prevent stray light from entering the focal plane. The optical baffles consist of concentric rings suspended between the secondary and the primary mirror. The secondary baffle for a large two-mirror optical system is designed and analyzed in this paper. According to mission of a telescope the structure should have high stiffness and high reliability and light weight. Compared with invar aluminum alloy and titanium alloy carbon fiber composite is currently the best material in terms of weight-to-strength ratio. It also has advantages of high temperature tolerance and low thermal expansion. So carbon fiber composite is chosen as material to meet requirements of the coaxial telescope. In this paper optimization method based on finite element analysis (FEA) is used for design the secondary baffle. Minimum weight of the baffle is chosen as an objective function. Thicknesses of former tube and vanes are chosen as variables. Analysis results show that the designed secondary baffle has maximum diameter of 180mm total length of 120mm and weighs 142g. And its fundamental frequency reaches 651Hz. Therefore the baffle has many advantages such as ultra-light weight high stiffness and dimensional stability etc. The optimization method and the baffle design can be helpful to other coaxial telescopes such as Cassegrain Gregorian and their subdivisions. 2012 IEEE.

Lightweight design and analysis of support structure of certain UAV engine (EI CONFERENCE) 会议论文 OAI收割
2012 International Conference on Electrical Insulating Materials and Electrical Engineering, EIMEE 2012, May 25, 2012 - May 27, 2012, Shenyang, Liaoning, China
Xing X.; Liu B.; Han X.; Jia H.

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Support structure of UAV (Unmanned Aerial Vehicle) engine is the important support for UAV engine playing a support role and bearing extremely complex load so its lightweight strength and dynamic characteristics have a great influence on high performance of UAV. This paper focuses on UAV having the requirement of high performance and stability to the support structure of engine and uses the software of MSC.Patran and MSC.Nastran and topology optimization criterion to lightweight design and analysis the support structure of UAV engine under the premise condition of existing constraints. Then the static strength and modal are analyzed for the result of lightweight design and the strength of the model and dynamic characteristics are verified. (2012) Trans Tech Publications Switzerland.

Research on defect detection technology of C/C composite (EI CONFERENCE) 会议论文 OAI收割
2011 International Conference on Advanced Engineering Materials and Technology, AEMT 2011, July 29, 2011 - July 31, 2011, Sanya, China
作者: Li W.; Wang H.; Wang H.; Wang H.; Wang H.

收藏 | 浏览/下载：27/0 | 提交时间：2013/03/25

Carbon matrix/Carbon fibre reinforced composite(C/C composite) has many special characteristics such as high strength high elastic modulus high temperature resistance and ablation resistance. So it is used to manufacture rocket engine nozzle in aerospace filed. But its security will be seriously effected during rocket engine working due to the manufacturing defects. Based on analyzing defect types and structure characteristic of C/C composite the ultrasonic and infrared testing methods on C/C composite are further studied in this thesis. and effective defect detection has been achieved. (2011) Trans Tech Publications.

Effect of Aqueous Environment on High Cycle and Very-High-Cycle Fatigue Behavior for a Structural Steel 会议论文 OAI收割
8th International Conference on Fracture and Strength of Solids (FEOFS) 2010, Kuala Lumpur, MALAYSIA, JUN 07-09, 2010
作者: Hong YS(洪友士); Qian GA(钱桂安)

收藏 | 浏览/下载：17/0 | 提交时间：2012/04/01

Very-high-cycle fatigue aqueous environment fatigue strength fatigue crack initiation fatigue crack propagation structural steel HIGH-STRENGTH STEELS CRACK-PROPAGATION INITIATION FRACTURE