中国科学院机构知识库网格系统: 检索

Deterioration of the performance of cement mortar lining due to sulfate attack 期刊论文 OAI收割
ENVIRONMENTAL GEOTECHNICS, 2022, 卷号: 9, 期号: 5, 页码: 318
作者: Zhang, Wang; Xiao, Ben-lin; Hu, Da-wei; Zhou, Hui; Zheng, Jun

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收藏 | 浏览/下载：19/0 | 提交时间：2023/08/02

degradation of geomaterials seepage strength & testing of materials

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：30/0 | 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

Enhancing dislocation emission in nanocrystalline materials through shear-coupled migration of grain boundaries 期刊论文 OAI收割
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2014, 卷号: 601, 页码: 153-158
作者: Li JJ(李建军); Soh, AK; Wu XL(武晓雷)

收藏 | 浏览/下载：28/0 | 提交时间：2014/06/05

Nanocrystalline materials Dislocations Shear-coupled migration of grain boundaries Strength and ductility

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.

收藏 | 浏览/下载：43/0 | 提交时间：2013/03/25

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.

Experimental study of the influence of thermal shock on mechanical properties of ceramic coating systems 会议论文 OAI收割
Beijing, China, June 16, 2013 - June 21, 2013
作者: Li XN(李霄娜); Liang LH(粱立红); Wei H; Wei YG(魏悦广)

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收藏 | 浏览/下载：53/0 | 提交时间：2018/11/08

Bending strength Bending tests Ceramic coatings Ceramic materials Elastic moduli Fracture Hardness Mechanical properties Microstructure Thermal shock Air plasma sprayed Change of temperatures Coating substrate systems Nanoindentation tests Nanostructured coatings Shock temperature Temperature range Three point bending test

Thermal-structure analysis of supersonic dome based on three materials (EI CONFERENCE) 会议论文 OAI收割
2011 International Conference on Electric Information and Control Engineering, ICEICE 2011, April 15, 2011 - April 17, 2011, Wuhan, China
Jiang Z.; Ai X.; Wei Q.; Liu B.; Jia H.

收藏 | 浏览/下载：25/0 | 提交时间：2013/03/25

To a supersonic missile a seeker could enhance the aerodynamic ability due to decrease the resistance in flying. At the same time the primary function of a seeker has been considered as the most important equipment for a missile due to the importance for cueing of targets and tracking for the final approach. However the dome of a seeker which is made up of glass has poor mechanical performance. Especially in the higher altitude for a dome in which the aerothermal and pressure loads could destroy the structure easily it is necessary to do the thermal-structure coupled analysis due to varied materials. In the paper to take the spherical dome of a seeker as a example the analysis has been completed according to the varied materials consist of MgF2 Al2O3 and ZnS. The temperature loads and the pressure loads derived from the results of fluent analysis has been forced on the surface of dome which simulates the actual Mach 2.5 in flying. According to the results of coupled analysis the SEQV stress of the dome radium 80mm based on three materials had reached to 31MPa which shows that the strength is sufficient for Mach 2.5 and offered the warranty to design the attaching to missile for the dome. At the same time the results required the flexible mounting for the dome due to the displacements results which the crystal material couldn't accept. 2011 IEEE.

Visual data mining of SARS distribution using self-organization maps 会议论文 OAI收割
International Conference on Management and Service Science, MASS 2009,, Wuhan, China, September 20, 2009 - September 22,2009
Li, Yanli; Hu, Bisong; Gong, Jianhua; Cao, Wuchun; Fang, Liqun

收藏 | 浏览/下载：39/0 | 提交时间：2014/12/07

Normal distribution Color image processing Economic and social effects Functions Health Strength of materials

Fabrication technique of large-scale lightweight SiC space mirror (EI CONFERENCE) 会议论文 OAI收割
3rd International Symposium on Advanced Optical Manufacturing and Testing Technologies, AOMATT 2007: Large Mirrors and Telescopes, July 8, 2007 - July 12, 2007, Chengdu, China
作者: Zhang G.; Zhang G.; Zhang G.

收藏 | 浏览/下载：20/0 | 提交时间：2013/03/25

Silicon carbide (SiC) is a new type candidate material for large-scale lightweight space mirror. Its low thermal distortion high stiffness high optical quality and its dimensional stability are better than other traditional optical substrate materials such as ULE Zerodure Beryllium (Be) and so on. In this paper the lightweight silicon carbide space mirror blank was fabricated by reaction sintering. As a space born mirror material silicon carbide must be an optical grade ceramic. So we prepared the silicon carbide green body with gel-casting method. Then some carbon materials were supplemented into the green body which will bring reaction-sintering with silicon in a vacuum furnace during 1500-1600C ultimately the reaction bonded silicon carbide was made. The diameter of SiC space mirror blank we have made is 680mm. If expanding the size of the vacuum furnace bigger mirror blank can be obtained. The test results show that the mechanical and thermal properties of RB-SiC are excellent with bending strength of 350MPa fracture toughness of 4.1 MPa·m1/2 and coefficient of thermal expansion(CET) of 2.6710-6/K. The surface roughness(RMS) could be better than 3nm.

锐缘硬质轮在金属表面的滚动与滑动 期刊论文 OAI收割
摩擦学学报, 1994, 卷号: 14, 期号: 2, 页码: 115-123
张国威; Howes V R; Ryan M A

收藏 | 浏览/下载：22/0 | 提交时间：2015/07/08

锐缘硬质轮滚动滑动界面应力材料的强度 sharp-edged hard wheel rolling sliding interface stress strength of materials

Influence of surfactnats on properties of gibbsite particles from carbonizaiton of sodium aluminate liquors 会议论文 OAI收割
San Francisco, CA, United states, February 13, 2005 - February 17, 2005
作者: Wang, Zhi; Bi, Shiwen; Yang, Yihong; Yuan, Zhangfu

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收藏 | 浏览/下载：0/0 | 提交时间：2023/06/16

Additives - Aluminum plants - Carbonization - Particle size analysis - Sodium compounds - Strength of materials - Surface active agents