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  • 1
    Electronic Resource
    Electronic Resource
    Improved Damage Model of 2-D Delamination (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 324-325 (Nov. 2006), p. 439-442 
    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: This paper proposes an improved damage model and derives the shear correction factorsfor the model based on the Whitney[1] method. As the model is mainly used in the delamination front,the overly strong assumptions for geometric deformation in this region may be relaxed so that morerealistic displacement fields can be established
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/52/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.324-325.439.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Effects of Water Jet Peening on Fatigue Properties of SPA-H and SPCC Steel (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 324-325 (Nov. 2006), p. 1229-1232 
    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: An experimental study of high pressure water jet peening treatment on SPA-H and SPCCsteel was conducted to study the effects of cavitation impacts of high-speed water on fatigue crackinitiation and propagation of notched specimens. Pull-pull fatigue tests’ condition was 350 MPamaximum stress amplitude, 0.1 stress ratio and 10Hz frequency, while in-situ observation by SEMwas employed. It was found that fatigue life of water jet peening treated SPA-H specimens has beenobviously elongated by comparison with specimens without this treatment. However, for SPCCsteel specimens, by comparison with those without water jet peening treatment, fatigue life was alittle elongated, almost the same and obviously shortened corresponding to water jet peeningtreatment time of 5, 10 and 15 minute, respectively. High pressure water jet caused surfacecorrosion for SPCC low carbon steel, while with almost the same carbon content, copper, chromiumand nickel elements increased anti-corrosion properties of SPA-H steel. These resulted in thedifferent fatigue life of SPA-H and SPCC steel. In-situ observation on the crack tips approved aboveanalysis
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/52/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.324-325.1229.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Combustion Synthesis in Mn-Si-C-N Using Mn as a Surrogate for Am (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 26-28 (Oct. 2007), p. 919-924 
    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: The paper outlined here uses self-propagating high-temperature synthesis (SHS) orcombustion synthesis that employs more efficient and effective high reaction and cooling rates toproduce high quality, reproducible nitride fuels. The fundamental SHS processing parameters wasdetermined to produce Mn-Si-C-N ceramic compounds in which Mn is a surrogate for Am. Becausemanganese nitride has a relatively low heat of formation the reaction can not be self-sustaining whenSi was blended with Mn in the Si:Mn=0.25:1 ratio. The purity of MnSiN2 increases with an increaseof the Mn content in Mn-Si-N system. Pure MnSiN2 can be synthesized when Si was blended with Mnin the Si:Mn = 0.5:1 ratio. Volume expansion and porosity decreases, so density, strength andhardness increase as increasing the Mn content in Mn-Si-N system. The powders and sintered cake ofMnSiN2-Si3N4 or MnSiN2-Si3N4-SiC was produced by combustion synthesis. The sintered cake ofMnSiN2-Si3N4-SiC is attacked by atmospheric moisture to fall to a powder
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.26-28.919.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Microstructure and Mechanical Properties of A Ultra-High Carbon Steel (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 324-325 (Nov. 2006), p. 907-910 
    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: A ultrahigh carbon steels (UHCS) containing 1.6 wt pct carbon was studied. Throughspheroidizing process by divorced-eutectoid transformation (DET), the forged microstructure wasspheroidized and the microstructure was fine carbide particles distributed in ferrite matrix.Second-time heat treatment included two kinds of technologies: normalizing and quenching +tempering. Finally, the UHCS obtained ideal mechanical properties. The yield strength and tensilestrength of the UHCS were higher than that of 40CrNiMo, moreover plasticity of the UHCS wasequal to that of 40CrNiMo. So the UHCS was an excellent structural material
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/52/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.324-325.907.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    Combustion Synthesis of Magnesium Silicon Nitride Powders in the Mg-Si-N System (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 336-338 (Apr. 2007), p. 935-938 
    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: A combustion synthesis process was developed for the synthesis of magnesium silicon nitridepowders in the Mg-Si-N system. The effects of ammonium halide addition and the nitrogen presssure onthe phase composition and microstructure of the final product were discussed in detail. It was found thatammonium halides were helpful to enhance the nitrogen infiltration, decrease the agglomeration degreeand improve the nitridation reaction. Furthermore, the nitrogen presssure greatly influenced the reactionprocess and the properties of the final MgSiN2 products, especially the phase composition. MgSiN2powders with low level of impurities (MgO and free Si) could be synthesized through combustionsynthesis process in the Mg-Si-N system
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.336-338.935.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    Low-Pressure Preheating Combustion Synthesis of Silicon Nitride (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 26-28 (Oct. 2007), p. 441-444 
    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: Silicon nitride was prepared by means of low-pressure preheating combustion synthesis inthis paper. When N2 pressure is less than or equal to 2MPa, the lowest preheating temperature is about653K, reactant could make silicon nitride by combustion synthesis. The additive of ammoniumfluoride and ammonium chloride, as the reactive diluent, and Si react and make some usefulintermediate products to α -Si3N4 after thermal decomposition. The reactive diluent content must beappropriate. At the same time, with the improvement of Si3N4, as the inert diluent, content in reactant,the adiabatic flame temperature of system would reduce, and combustion reaction rate of Si alsodrops, so it is propitious to make high level of α -Si3N4
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.26-28.441.pdf
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  • 7
    Electronic Resource
    Electronic Resource
    An Evaluation of the Effective Block Approach for Predicting Crack Growth under an Untested Spectrum Using P-3C and F-111 Test Data (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 41-42 (Apr. 2008), p. 189-197 
    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: Recently an effective block approach has been proposed to address the experimentallyobserved high growth rates of fatigue cracks at the critical locations on F/A-18 airframes. Thisapproach treats a spectrum block as one equivalent constant amplitude cycle. Hence, the crackgrowth rate may be represented by a Paris-type equation, with the model parameters dependent onthe load spectrum. This approach has been applied to the F/A-18 crack growth analysis, with goodcorrelation to experimental data. In this paper, we summarise recent evaluation work of theapproach using experimental data obtained under P-3C and F-111 spectra. An improved method fortransferring the model parameters from a tested spectrum to an untested spectrum, suggested by thefirst author of the current paper, has been evaluated in comparison to the original procedureproposed. The soundness of relying on third-party tools based on constant amplitude model for theprediction of relative severity of spectra is also discussed. Finally, the advantages and limitations ofthe effective block approach are highlighted
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.41-42.189.pdf
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  • 8
    Electronic Resource
    Electronic Resource
    Skin-Core Micro-Structure and Surface Orientation of Carbon Nanotube Composites by Injection Molding Process (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 136 (Feb. 2008), p. 51-56 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: Multi-walled carbon nanotube (MWNT) was filled into poly (ethylene terephthalate)(PET) matrix and MWNT/PET composite was prepared by injection molding process. Themicrostructure and electrical conductive property were investigated carefully. After injectionmolding, the electrical conductivity of injected sample decreased sharply because of the orientationof CNT due to strong shearing force. The electrical conductive network of CNT had been destroyedafter orientation of CNT. Because of the difference of shearing rate between the surface and thebody center during the injection molding process, a skin-core structure emerged. Near the surface,the injected sample has higher degree of orientation of CNT and higher electrical resistance
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/24/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.136.51.pdf
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  • 9
    Electronic Resource
    Electronic Resource
    Mechanisms of Heat Transfer in Rotary Shaft of Rotating Machine with Nano-Sized Particles Lubricant (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 505-507 (Jan. 2006), p. 31-36 
    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: This study presents an analysis of surfactant added by CuO and Al2O3 nano-sized particles of different percentages. After adding suspending nanocrystalline particles into lubricant of machines, the nano-sized particles will augment the heat transfer characteristics of fluids. Some former studies showed that such liquids pose a great potential for heat transfer enhancement. By applying nanofluids to heat transfer of machine lubricant, this paper attempts to explore dominating factors of heat transferperformance from various weight concentrations of nano-sized particles, the correlation among wall temperature, heat flux, rotational Reynolds number, Nusselt number, Grashof number and rotational Grashof number of four different concentrations. The results show that nano-sized particle lubricantoffer a better heat transfer performance than typical lubricants. Since random movement and diffusing effect of nano-sized particles are one crucial factor for an increased heat transfer coefficient, adding 3.5% weight concentration nano-sized particle lubricant will produce an optimum heat transfer performance among Case I~IV
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/11/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.505-507.31.pdf
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  • 10
    Electronic Resource
    Electronic Resource
    Plastic Behaviour of Copper Polycrystal Subjected to Fatigue-Tension Sequential Loading Tests (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 514-516 (May 2006), p. 897-900 
    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: Sequences of fatigue-tension tests were performed on copper polycrystal sheet, with32µm mean grain size. The effect of strain path change on subsequent reloading yield stress as well as work hardening rate has been investigated. Dislocation microstructure was observed by transmission electron microscopy after mechanical tests. Under present conditions, it was found that fatigue prestraining caused the increase of reloading yield stress, larger amplitude of strain path change resulted in higher reloading yield stress and lower work hardening rate. Reloading tensilecurves are independent of predeformation plastic strain amplitudes in both cases. Many isolated dislocation lines between cell walls have been detected for Φ=0° case when the subsequent tension strain amount is 5%, this can be well understood from the microscopic dislocation slip mechanisms. When the reloading tension tests have been done until rupture, dislocation structures become typical of monotonic tension without preloading. The correlation of mechanical properties and microstructural observations was discussed in this paper
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/12/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.514-516.897.pdf
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