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  • 1
    Electronic Resource
    Electronic Resource
    The Investigation of High Temperature Substeady Creep in Pure Aluminium by Positron Annihilation (1994)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 175-178 (Nov. 1994), p. 443-446 
    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
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/00/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.175-178.443.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    FE Simulation of Diamond Turning with Different Friction Coefficients (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 339 (May 2007), p. 72-77 
    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 work, a coupled thermo-mechanical plane-strain large deformation FE cuttingmodel is developed to simulate diamond turning based on the updated Lagrangian formulation. Asexpected, the effects of friction coefficient on cutting forces, chip deformation, cutting temperature,flow stresses and shearing angle are investigated by FE simulations. The simulated results can beadopted as a reference to select the reasonable friction coefficient in diamond turning process
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.339.72.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Experimental Investigation on 2D and 3D Braided C/SiC Composites (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 326-328 (Dec. 2006), p. 1685-1688 
    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: Tensile tests of two-dimensionally braided C/SiC composites and three-dimensionallybraided C/SiC composites had been carried out at room temperature. Some specimens had beenunloaded during experiments. Acoustic Emission signals also had been collected duringexperiments. The following conclusions were arrived. The stress-strain curves of these twomaterials were of nonlinear characters, and there were no obvious linear segments on those curves.Failure characters of these two materials were different: There appeared ply pull-out for 2D braidedC/SiC specimens and there appeared zigzag shape for 3D braided C/SiC specimens. Stress-straincurves of loading-unloading tests and Acoustic Emission signals of those two materials showeddamage evaluation during tests. There were different AE counts and AE energy characters betweentwo materials
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/52/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.326-328.1685.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Microstructure and Damage Evolution of Ceramic Matrix Composite (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 326-328 (Dec. 2006), p. 1177-1180 
    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 tensile damage evolution of 2D plain woven C/SiC composites strengthened with 1Kand 3K carbon fiber bundles and microstructure’s influence on material’s damage evolution wereinvestigated using the Acoustic Emission technology (AE) and failure observation. Experimentalresults reveal that damage evolution of these two kinds of composites is a gradual procedure andthis procedure consists of three phases. There is no damage during the first phase. During thesecond phase, the damage, mainly consisting of matrix microcrack cracking, interface debonding offiber and joining of microcrack, random takes place in the whole area of specimen. During the thirddamage phase, the damage, mainly consisting of macrocrack cracking, fibers breaking and fiberspulling out, mainly takes place in the local failure area of specimen. Because the microstructures ofcomposites with 1K and 3K carbon fiber bundles are different, their damage mechanisms aredifferent. Composite strengthened with 1K carbon fiber bundles get in second phase at 90% failurestress, and their main energy dissipation occurred during the second damage phase. WhileComposite strengthened with 3K carbon fiber bundles get in second phase at 80% failure stress, andtheir main energy dissipation occurred during the third damage phase
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/52/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.326-328.1177.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    The Study of Collateral Damages in the Process of Femtosecond Laser Micromachining Single-Crystalline Silicon (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 532-533 (Dec. 2006), p. 560-563 
    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: Femtosecond laser pulses are irradiated on a single-side polished single-crystalline siliconwafer. Metamorphic zone appears around the ablated zone and the morphology changes gradually inthe metamorphic zone. Typical phenomena of thermal ablation such as melt-resolidification andsubtransparent glassy materials occur in the marginal area of the ablated zone. No apparent changesare found among microscopic morphologies of the ablated, metamorphic and unirradiated zones.There are flaws and spallations on the smooth back surface of the wafer, which are caused by thestress inside the sample. Nanomechanical properties of the sample surface hardly change in the smallscope of the backside around the ablated zone. While regular changes occur in large scope, which isthe conjunct result of such stresses caused by many different collateral damages
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/14/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.532-533.560.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    Application of Atmospheric Pressure Plasma in the Ultrasmooth Polishing of SiC Optics (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 532-533 (Dec. 2006), p. 504-507 
    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 paper presents a novel, rapid and damage-free method to polish the ultra-smoothsurface of the SiC optics. First, the basic philosophy of this method is introduced, which uses theactive radicals got from CF4 in the atmospheric pressure plasma zone to react with the SiC material atthe optics surface to generate the vaporization of SiF4. Then, the design of the atmospheric pressureplasma jet and the corresponding prototyping polishing facility are introduced. The theoreticalanalysis on the necessary conditions to generate the excited radicals is also presented in this part. Toverify the effectiveness of this novel polishing method, experiments on the generation of atmosphericpressure plasma and the SiC optics polishing are carried out with our prototyping facility. Theexperiment results show that plasma discharge is stable at the atmospheric pressure andsub-nanometer roughness of the polished SiC surface can be obtained
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/14/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.532-533.504.pdf
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  • 7
    Electronic Resource
    Electronic Resource
    Defects in Electron Irradiation Te-Doped GaSb Studied by Positron Lifetime Spectroscopy (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 607 (Nov. 2008), p. 140-142 
    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: Defects induced by electron irradiation in Te-doped liquid-encapsulated Czochralski–grown GaSb were studied by the positron lifetime spectroscopy. The lifetime measurements under room temperature indicated there were VGa-related defects with a characteristic lifetime of 298 ps in the heavily Te-doped as-grown GaSb samples. The average lifetime increased with the increase of irradiation dose in lightly Te-doped GaSb,but the behavior was opposite in the heavily Te-doped samples. It should be due to the shift of Fermi level in heavily Te-doped GaSb and the occurrence of gallium vacancies in different charge states. In the temperature dependence measurements carried out on heavily Te-doped samples, we observed positron shallow trap, and this shallow trap should be attributed to positrons forming hyrogenlike Rydberg states with GaSb antisite defects
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/20/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.607.140.pdf
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  • 8
    Electronic Resource
    Electronic Resource
    Investigation of Free Volume in Epoxy Resins Studied by PALS (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 607 (Nov. 2008), p. 82-84 
    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: The influences of curing agents and the water absorption on the microstructure have been studied by positron annihilation lifetime spectroscopy (PALS) and gravimetric measurement for epoxy resins DER331 (E51). We found that the o-Ps lifetime 3τ dramatically decreases with the immersion time from 0h to 6h, and then reaches a saturate level in higher water absorption, while the o-Ps intensity almost remains a constant for all samples. This fact indicated that the water was first filled into free volume holes at low water content. The observation of the constant of I3 suggested that the free volume concentration was not affected by the water sorption. Experimental results indicated that both chemical reaction between the positronium and chlorines and electronegative chlorines attracting positrons can reduce the positronium formation
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/20/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.607.82.pdf
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  • 9
    Electronic Resource
    Electronic Resource
    Positron Annihilation and Chemistry of Groups in Hyperbranched Polymers (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 607 (Nov. 2008), p. 85-87 
    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: In this paper, both lifetime and intensity in hyperbranched polymers were measured by using positron annihilation lifetime spectroscopy (PALS) measurements. Ortho-positronium properties upon the degree of branching (DB) have been studied; o-Ps lifetimes maintain a constant while an increase in o-Ps intensities has been detected with DB increasing. Which is inconsistent with author’s prediction and indicate that interactions between positronium and the free-volumes are strongly depend on not only the free-volume size properties but also its chemistry environment, due to the variations in the distribution of the different ending groups: –OH and -CH3, caused by DB changes in hyperbranched polymers. The present works demonstrate that in the polar-polymeric application of PALS, effects of the distribution of polar groups should be properly taken into consideration
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/20/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.607.85.pdf
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  • 10
    Electronic Resource
    Electronic Resource
    Influence of Free Volume on Damping Properties for CIIR and CIIR/PEA Investigated by Positron (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 607 (Nov. 2008), p. 91-93 
    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: The effect of the free volume on damping properties for CIIR (Chlorinated isoprene-isobutylene rubber) and CIIR/PEA (polyethylacrylate) were investigated by positron annihilation lifetime spectroscopy and DMA, respectively. The DMA results indicate that the tanδ peaks of CIIR and CIIR/PEA both have very broad covering temperature range. The tanδ peak of CIIR/PEA shifts to higher temperature region which indicates that the CIIR/PEA has better damping property in high temperature region that CIIR. From PALS results, we found that the lifetime of o-Ps in CIIR and CIIR/PEA both exhibit broad glass transition. It is interestingly that the glass transition region of CIIR/PEA also shifts to higher temperature than CIIR. This character of the free-volume is well in agreement with the damping properties obtained by DMA. It indicates that the free volume has close relationship with damping mechanism for CIIR and CIIR/PEA
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/20/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.607.91.pdf
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