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  • 2005-2009  (600)
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  • 11
    Electronic Resource
    Electronic Resource
    Effect of Heat Treatment and Transformation on Bending Angle in Laser Forming of Titanium Foils (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 344 (July 2007), p. 243-250 
    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: Pure titanium foils were bent by laser forming and the effect of c-d transformation andhistory of heat treatment of specimen on bending angle was investigated. The thickness of specimenswas changed from 40 to 100om, the length of them was 20mm and the width of them was 10mm. Thespecimens were annealed at 600-1100oC for 30 minutes in argon atmosphere. A 20W YVO4 laser wasemployed and laser power was changed from 2 to 16W. From the experimental results, when laserpower was increased, bending angle also increased and it was dramatically changed at the laserpowers occurring c-d transformation and melting. Bending angle increased as grain size increasedand it jumped up when grain size exceeded the foil thickness and then became constant. Bendingangle decreased by annealing after forming and degree of decrease was greater when the annealingtemperature before forming was lower
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/54/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.344.243.pdf
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  • 12
    Electronic Resource
    Electronic Resource
    Elastic-Plastic Constitutive Equation Accounting for Microstructure (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 340-341 (June 2007), p. 1037-1042 
    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 study, we focus on the modeling of solid structures that include microstructuresobserved in particle-dispersed composites. The finite element modeling can be used to clarify how themacroscopic behaviors of solid structures are influenced by the microstructures. In such a case, if thewhole structure including the microstructures is modeled by the finite elements, an enormous numberof finite elements and enormous amount of computational time are required. To overcome suchdifficulties, we propose a new method for modeling microstructures. In this method, an explicit formof the stress-strain relation covering both elastic and elastic-plastic regions is derived from theequivalent inclusion method proposed by Eshelby that provides mathematical solutions for stress andstrain at an arbitrary point inside and outside the inclusion. The derived elastic-plastic constitutiveequation takes account of the microstructures, so that the effect of microstructures on the macroscopicbehaviors can be obtained from the conventional finite element method by using such a constitutiveequation without modeling microstructures in the finite element analysis. The effectiveness of theproposed constitutive equation is verified for a simple problem by comparing the results of theone-element finite element analyses using the proposed constitutive equation with those of thedetailed finite element analyses using multi-element finite element modeling
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/54/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.340-341.1037.pdf
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  • 13
    Electronic Resource
    Electronic Resource
    Patterning of Self-Oriented Nanocrystals in an Amorphous Alloy under Focused Ion Beam Irradiation (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Journal of metastable and nanocrystalline materials Vol. 24-25 (Sept. 2005), p. 483-486 
    Details
    ISSN: 1422-6375
    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/2011/0528/01/43/transtech_doi~10.4028%252Fwww.scientific.net%252FJMNM.24-25.483.pdf
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  • 14
    Electronic Resource
    Electronic Resource
    Evaluation Method for Fracture Mechanics-Based Material Toughness from Charpy Impact Test (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 512 (Apr. 2006), p. 61-66 
    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/2011/0528/02/12/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.512.61.pdf
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  • 15
    Electronic Resource
    Electronic Resource
    In Situ Observations of Sintering Process during Pulsed Current Sintering of Al〈sub〉2〈/sub〉O〈sub〉3〈/sub〉, ZnO and WC Alloy (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 534-536 (Jan. 2007), p. 541-544 
    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: Pulsed Current Sintering (PCS) process possesses some problems that need to beresolved. We, therefore aims at understanding phenomena of PCS process by presenting some basicdata on in situ sintering behavior of PCS. In order to observe in situ sintering behavior of PCS, aspecial graphite mold equipped with thermo couple and electrodes were designed to measure thetemperature, electric current and voltage inside the powder during PCS process. We apply threetypes of raw materials, especially for ZnO (thermoelectric material) as semiconductor, Al2O3 asnon-conductor and WC (Tungsten Carbide) as good conductor. The observation succeeded andsome valuable data were obtained. The results showed that the temperature in the Al2O3 powder is100 K higher than the graphite mold at the temperature of 1473K and ZnO powder is 150 K higherthan the graphite mold at the temperature of 1373K. The electric current and voltage were measuredfor each powder during PCS process. In addition, their electric resistance properties were calculated.The electric resistance showed different behavior
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/14/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.534-536.541.pdf
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  • 16
    Electronic Resource
    Electronic Resource
    Wear Resistance Properties of Tungsten Carbide/Stainless Steel Composite Materials Prepared by Pulsed Current Sintering (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 534-536 (Jan. 2007), p. 1573-1576 
    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: Austenitic stainless steel has been used as a corrosion resistance material in toughcorrosive circumstance. However, austenitic stainless steel has poor wear resistance property due toits low hardness. Tungsten Carbide alloys (WC) are widely used as tooling materials, because oftheir high hardness and excellent wear resistance property. In this investigation, we apply powdercomposite process to obtain hard layer of Stainless steel. The composite material was fabricatedfrom planetary ball milled WC powder and SUS316L stainless steel powder and sintered by PulsedCurrent Sintering (PCS) method. We also added TiC powder as a hard particle in WC layer.Evaluations of wear properties were performed by pin-on-disk wear testing machine, and aremarkable improvement in wear resistance property was obtained. The weight loss rate of thecomposite was 1/10 of SUS316L. In addition, it was found that TiC hard particle addition has apositive effect on the wear resistance property. EPMA investigation showed good dispersion of WChard phase and TiC hard particle with SUS316L matrix
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/14/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.534-536.1573.pdf
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  • 17
    Electronic Resource
    Electronic Resource
    Repeated injections of energy in the first 600 ms of the giant flare of SGR 1806–20 (2005)
    [s.l.] : Macmillian Magazines Ltd.
    Nature 434 (2005), S. 1110-1111 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The massive flare of 27 December 2004 from the soft γ-ray repeater SGR 1806–20, a possible magnetar, saturated almost all γ-ray detectors, meaning that the profile of the pulse was poorly characterized. An accurate profile is essential to determine physically what ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/nature03573
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  • 18
    Electronic Resource
    Electronic Resource
    Fracture tests of microsized TiAl specimens (2005)
    PO Box 1354, 9600 Garsington Road, Oxford OX4 2XG, UK. : Blackwell Science Ltd
    Fatigue & fracture of engineering materials & structures 28 (2005), S. 0 
    Details
    ISSN: 1460-2695
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: γ-TiAl-based materials have the ability to provide superior creep strength, high yield strength and Young's modulus at temperatures as high as 700 °C. This has led to the consideration of γ-TiAl-based materials for use in microelectromechanical systems (MEMS) intended for application at elevated temperatures. One γ-TiAl-based material under consideration for these applications is the composition known as Alloy 7/Ti–46Al–5Nb–1W (at%). In this case, this material is tested in the as-wrought form with a fully lamellar structure and a colony size ≈75 μm. The effect of loading volumes of this material smaller than conventional samples is investigated. This is carried out in order to improve understanding of the fracture toughness behaviour, which ultimately will be required of components of this material with a cross-section ≈18 × 6 μm. Here, we focus upon a specially developed machine, which provides accurate loading of microsized cantilever beams through a diamond tip. The directional nature of the fracture toughness properties of this material is considered in relation to the local orientation of the lamellar microstructure and the resulting failure modes occurring.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1460-2695.2005.00893.x
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  • 19
    Electronic Resource
    Electronic Resource
    Micromechanical testing of SU-8 cantilevers (2005)
    PO Box 1354, 9600 Garsington Road, Oxford OX4 2XG, UK. : Blackwell Science Ltd
    Fatigue & fracture of engineering materials & structures 28 (2005), S. 0 
    Details
    ISSN: 1460-2695
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: SU-8 is a photoplastic polymer with a wide range of possible applications in microtechnology. Cantilevers designed for atomic force microscopes were fabricated in SU-8. The mechanical properties of these cantilevers were investigated using two microscale testing techniques: contact surface profilometer beam deflection and static load deflection at a point on the beam using a specially designed test machine. The SU-8 Young's modulus value from the microscale test methods is approximately 2–3 GPa.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1460-2695.2005.00873.x
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  • 20
    Electronic Resource
    Electronic Resource
    Fatigue and fracture of a Ni–P amorphous alloy thin film on the micrometer scale (2005)
    PO Box 1354, 9600 Garsington Road, Oxford OX4 2XG, UK. : Blackwell Science Ltd
    Fatigue & fracture of engineering materials & structures 28 (2005), S. 0 
    Details
    ISSN: 1460-2695
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Fracture and fatigue tests have been performed on micro-sized specimens for microelectromechanical systems (MEMS) or micro system technology (MST) applications. Cantilever beam type specimens with dimensions of 10 × 12 × 50 μm3, approximately 1/1000th the size of ordinary-sized specimens, were prepared from a Ni–P amorphous thin film by focused ion beam machining. Fatigue crack growth and fracture toughness tests were carried out in air at room temperature, using a mechanical testing machine developed for micro-sized specimens. In fracture toughness tests, fatigue pre-cracks were introduced ahead of the notches. Fatigue crack growth resistance curves were obtained from the measurement of striation spacing on the fatigue surface, with closure effects on the fatigue crack growth also being observed for micro-sized specimens. Once fatigue crack growth occurs, the specimens fail within one thousand cycles. This indicates that the fatigue life of micro-sized specimens is mainly dominated by a crack initiation process, also suggesting that even a micro-sized surface flaw may be an initiation site for fatigue cracks which will shorten the fatigue life of micro-sized specimens. As a result of fracture toughness tests, the values of plane strain fracture toughness, KIC, were not obtained because the criteria of plane strain were not satisfied by this specimen size. As the plane strain requirements are determined by the stress intensity, K, and by the yield stress of the material, it is difficult for micro-sized specimens to satisfy these requirements. Plane-stress- and plane-strain-dominated regions were clearly observed on the fracture surfaces and their sizes were consistent with those estimated by fracture mechanics calculations. This indicates that fracture mechanics is still valid for such micro-sized specimens. The results obtained in this investigation should be considered when designing actual MEMS/MST devices.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1460-2695.2005.00923.x
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