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  • 2005-2009  (489)
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  • 11
    Electronic Resource
    Electronic Resource
    Crack Spacing and the Flow Stress in NiTi Thin Films Deposited on Cu Substrate (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 385-387 (July 2008), p. 89-92 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Ti-51.45at.%Ni thin films were deposited onto copper substrates by magnetron sputtering.The copper substrates were pre-punched into dog-bone specimens with 4.5mm×30mm(gauge portion)×35µm( thickness). The substrate temperature was about 673K. The thin films were about 20µm thick.The as-deposited films were first solution treated at 1073K for 1h, and then aged at 773K for 30min.The grain size was estimated to be 1.5µm from scanning electron microscopy micrographs. Tensiletests were carried out on CSS-44100 electron universal test-machine. The strain rate was 1.1×10-4 s-1.The stress-strain curves of the free-standing film were obtained from the experimental stress-straincurves of copper substrate together with the thin film adherent to the substrate compared with thecurves of copper substrate without film. The Hall-Patch coefficient was calculated, k=205Mpa.µm1/2.It seems that the Hall-Patch coefficient decreases with increasing film thickness. The experimentalresults showed that a series of parallel cracks grew in a concerted fashion across the thin film and thecracks were equally spaced. The cracks were more closely spaced if the film stress was increased. Thefracture toughness of the film was estimated, c KΙ =0.96MPa·m1/2. Therefore, the minimum crackspacing is predicted by the film stress given
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/57/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.385-387.89.pdf
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  • 12
    Electronic Resource
    Electronic Resource
    Study on a New Type of Analogue Material for Geotechnical Tests and its Applications (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 33-37 (Mar. 2008), p. 693-698 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: This paper introduces many types of analogue materials in China and other countries ingeotechnical model tests. Combined with the study on a few geo-mechanical model tests ofsignificant tunnels and underground openings in Chinese western areas, this paper recommends anew type of analogue material, which is made from iron mineral powder, barite powder, quartzpowder and alcoholic solution with rosin. In order to know the physico-mechanical characteristicsof this composite material with different mixture ratios, we use specimens to do lots of mechanicalexperiments such as uniaxial compressive test, quasi-triaxial shear test, triaxial test and Braziliantest. Consequently, the analogue materials with different mixture ratios can be used to physicallymodel different projects, and this analogue material with a certain mixture ratio has beensuccessfully used in the model test of a branching-out tunnel. The results of the model test verifythat this new analogue material can be successfully used in all kinds of geotechnical model tests
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.33-37.693.pdf
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  • 13
    Electronic Resource
    Electronic Resource
    Sintering of Transparent Polycrystal Nd:YAG with MgO as Additive (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 368-372 (Feb. 2008), p. 426-428 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: In this paper, pure phase Nd-doped YAG powders were prepared by co-precipitation methodwith different amount of MgO (0~ 0.6 wt %) as additive. Transparent Nd:YAG ceramics were fabricatedby vacuum sintering at 1750ºC for 10 hours using the powders. Microstructure of the surfaces ofthermally etched Nd:YAG ceramics was observed by SEM. Transmittance of the transparent Nd:YAGceramics was measured over the wavelength region from 600nm to1200nm. The results showed thatMgO as sintering aid can restrain abnormal grain growth and reduce pores in grains and at the same time,optical transmittance of the ceramics was increased. The optimal weight percentage of MgO added can bedetermined as 0.3wt % for the fabrication of transparent Nd:YAG ceramics
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/56/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.368-372.426.pdf
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  • 14
    Electronic Resource
    Electronic Resource
    Preparation of Bi〈sub〉2〈/sub〉Te〈sub〉3〈/sub〉 Nano-Powders via an Aqueous Chemical Method (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 368-372 (Feb. 2008), p. 541-543 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Using NaBH4 as reductant, Bi2Te3 nano-powders with different morphology such as nano-rodand nano-sphere were synthesized from BiCl3 and Te through an aqueous chemical method attemperatures below 100°C. The nano-rods were 100~200nm in diameter and 10~12μm in length, thediameter of the nano-spheres is between 100 and 500nm. The phase purity of the powders was analyzedby XRD, micro morphology and chemical compositions were characterized by SEM and EPMA. Thereaction mechanism was discussed
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/56/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.368-372.541.pdf
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  • 15
    Electronic Resource
    Electronic Resource
    Study on Inner Micro-Grooves of Heat Pipe Spinning Process and Multi-Tooth Mandrel (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 375-376 (Mar. 2008), p. 358-363 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The manufacturing process of micro-grooves inside thin-walled copper heat-pipe is alwayscomplicated and difficult. Separately adopted GCr15 and W18Cr4V multi-tooth mandrel, a series ofexperiments have been done to machine axially inner micro-grooves of micro-heat-pipe with oil-filledsteel-ball spinning technology to analyze the mandrel effect and failure mechanism. It was studiedhow the tooth-shape of multi-tooth mandrel affects the inner micro-groove shape of the copper tubeand how the working position of multi-tooth mandrel affects groove-wall surface morphology andgroove path. The wear and fracture characteristics of multi-tooth mandrel are introduced. It is provedthat the form of GCr15 mandrel failure in machining micro-grooves is tooth-broken ortooth-collapsed, and its service life is short. Differently, the form of W18Cr4V mandrel failure is feltwear, and its service life is long
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/57/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.375-376.358.pdf
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  • 16
    Electronic Resource
    Electronic Resource
    Large Plastic Deformation and Ultra-Fine Grained Structures Generated by Machining (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 375-376 (Mar. 2008), p. 21-25 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Microstructure of machined copper chips at very low velocity was characterized bytransmission electron microscopy. The structure of the machined chip produced by reasonablecombinations of machining parameters is virtually entirely occupied by isolated equiaxed submicrongrains of 100~300nm in size with high-angle boundaries. A finite element model was developed tostudy large plastic deformation in plain orthogonal machining copper. The numerical results showmost of the grain refinement associated with the formation of ultra-fine grained chip may be attributedto the large shear strain imposed in the deformation zone. It is feasible to take machining process as amethod of preparing ultra-fine grained materials. But the optimal design of the machining processrequires a precise and quantitative understanding of the mechanics of deformation-induced subgrainmicrostructure
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/57/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.375-376.21.pdf
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  • 17
    Electronic Resource
    Electronic Resource
    Mechanics Analysis on Bar Cutting Based on High Speed and Restrained State (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 340-341 (June 2007), p. 471-476 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: There are many problems in the common baiting methods, such as bad cross-sectionquality, low efficiency and so on. In order to overcome these disadvantages, a new bar cuttingtechnology based on high speed and restrained state is put forward in the paper. The cutting processand cutting mechanics were analyzed. The stressing intensity factor and fracture toughness wereintroduced to analyze the influence of loading velocity on the cutting surface quality. By means ofthe dislocation theory, the influence of loading velocity on the fracture process was researched.Numerical simulation and experiments were carried out, and the results were conformed well withthe theoretical ones
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/54/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.340-341.471.pdf
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  • 18
    Electronic Resource
    Electronic Resource
    Microstructure and Properties of Al-Zn-Mg-Cu-Mn In Situ High Strength Alloy (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 561-565 (Oct. 2007), p. 957-960 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Al-Zn-Mg-Cu alloy containing 2%Mn was made using spray forming method and hotextrusion. XRD, OM, and SEM were used to investigate the microstructure. Results showed that afterbeing hot extruded and solid solution treated, the Al alloy matrix had uniformly fine recrystallizedgrain with an average size of 8μm. The particles of MnAl6 were formed during the spray formingprocess and distributed along the grain boundary. Deformation and spheroidization of MnAl6particles were occurred during post hot extrusion and solid solution treament, which would be benefitto the improvement of toughness of Al alloy. When aged at the T6 conditions, the tensile strength ofthe Al alloy was increased up to 775MPa with the elongation of 4.3%, the fracture surface consistedmainly of dimples with a size lower than 500nm
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/17/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.561-565.957.pdf
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  • 19
    Electronic Resource
    Electronic Resource
    Numerical Simulation and Structure Optimization of the Main-Control Reversing Valve of Electrical-Hydraulic Hammer (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 575-578 (Apr. 2008), p. 180-185 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Based on viscosity hydrodynamics and hydro-finite element theory, flow field of themain-control reversing valve of electrical-hydraulic hammer was simulated. The N-S equationswere discretized by the finite volume method. Hydraulic valve’s pressure and velocity distributionwere analyzed in the working process. Relationship between the structure of the flow field(velocity, pressure, flow separation and reattachment, appearing and disappearing of vortices) andthe energy loss and component performance was proposed. The design of the hydraulic valvestructure was optimized which turns out to be high-efficiency and energy-saving
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/18/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.575-578.180.pdf
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  • 20
    Electronic Resource
    Electronic Resource
    Investigation to the Damage Tolerance of Composite Cylinder for Vehicles by Numerical Simulation (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 575-578 (Apr. 2008), p. 198-203 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: As one type of the important alternative fuel containers, composite cylinders are widelyused in compressed natural gas vehicles (CNGV) all over the world. Compared to traditional metalcontainers, the performance of composite cylinders is more complicate because it is difficult toanalyze the material characteristics and the influence of manufacturing process. With the aid ofnumerical simulation, the damage tolerance of one type of composite cylinder was investigated inthis paper. Firstly, the usual damage modes and sizes that are generated in the serviced compositecylinders are classified to illustrate the dangerous parts in the composite cylinders. According to themanufacturing process of composite cylinders, the fiber material characteristics that account of theeffects of heat and resin are evaluated to conduct the numerical simulation. Under the damagemodes and sizes such as initial flaw, fiber fracture and delamination that are distributed in thecylinder in terms of the classification, the performance of composite cylinder are carried out. Withthe convenience of numerical simulation, the map of the dangerous sites under the elaboratedamage modes and sizes is given to evaluate the running condition of composite cylinders inpractice. The quantitative results are more useful to show the damage tolerance of compositecylinder than the traditionally qualitative check way and guarantee the running of CNGV
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/18/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.575-578.198.pdf
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