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  • 1
    Electronic Resource
    Electronic Resource
    Influence of Direct Current Field on Powder-Pack Boriding (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 118 (Dec. 2006), p. 167-172 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: The influence of direct current field (DCF) on powder-pack boriding has beeninvestigated by applying DCF between boriding agent and specimen during the soaking.Experimental results show that DCF has the function of heating the agent and the specimen and thusenhancing boriding. It is shown that the specimen’s side facing anode has the deepest boride casewhen the specimen is taken as cathode. It is proposed that DCF forces active boron-containingspecies to diffuse toward the specimen at the cathode. This makes boron concentration around thespecimen as cathode higher than that at the anode or other position and that in the conventionalpowder-pack boriding (CPB), which relatively decreases boron’s absorption by inner wall surfaceof the pack box and the non-working surface of the specimen. DCF’s physical effect of enhancingchemical reaction in the agent increases the activity and concentration of active boron atoms andboron-containing species, which overcomes the shortcoming that CPB can not produce enoughboron-containing species by conventional way of heating
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/22/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.118.167.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Experimental Study on Residual Stress of K24 Superalloy in Laser Cladding Zone by Laser Shock Processing (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 353-358 (Sept. 2007), p. 453-456 
    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 surface of K24 superalloy was processed with laser cladding & LSP (laser shockprocessing). Residual stress in the laser cladding zone by LSP was measured with X-ray stress testerX-350A, and the variational rule of residual stress in the cladding zone by tempering treatment of 8hours and 16 hours was measured, respectively. The experimental results show that compressiveresidual stress of K24 superalloy surface by laser cladding & laser shock processing is above-600MPa, which exceeds residual stress by mechanical peening treatment; and there is no clear effecton residual stress by tempering treatment at 600°C for 8 hours and 16 hours, respectively, which canimprove fatigue life of K24 superalloy
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/55/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.353-358.453.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Experimental Investigation on Residual Stress of Model S1100 of Crankshaft Chamfer Based on XRD (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 353-358 (Sept. 2007), p. 2301-2304 
    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: Residual stresses of model S1100 of crankshaft chamfer were measured by thetechnology of XRD. The distributions of residual stresses under mechanical peening, mechanicalrolling and isothermal quenching are measured, and the tests of fatigue life were conducted. Theresults showed that the distribution of residual stress by machining in the crankshaft chamfer iscomplicated, which is at the tensile-compressive status, and it is one of the main factors to affectfatigue life of the crankshaft; isothermal quenching improves the distribution of residual stress, andtensile stress of the crankshaft chamfer is changed into the compressive stress, which may satisfythe requests of fatigue testing for 5 × 106 cycles. Although the mechanical rolling improved theresidual stress distribution in the chamfer linked with the crank, tensile stresses in the chamferconnected with the linkage also increase, which influences the service life of the crankshaft
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/55/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.353-358.2301.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Investigation on Performance of QT700-2 Material by Laser Peening (2004)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 471-472 (Dec. 2004), p. 43-46 
    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: With the advent of high-power pulsed lasers, laser peening has emerged as a new and very promising technique to improve the resistance properties of materials to fatigue, wear and corrosion. In this paper, the effect of laser peening on the surface performance of QT700-2 materials was investigated, the parameters of laser peening were optimized by an artificial neural network (ANN) method. A series of experiments was carried out by using a high-power, Q-Switched, pulsed neodymium-glass laser. The microstructure features were analyzed with SEM and the hardness and residual stresses at the surface and in-depth were measured. The results indicate that the depth of hardened layer was about 0.31ı1.40mm for a different shot number of 1-4 times and the compressive residual stress at the surface increases with increasing laser pulse energy, from -165MPa for the lowenergy 12J to -410MPa for the higher energy 20J. Laser peening can restrain nucleation of fatigue cracks and improve the fatigue life of nodular cast iron materials
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/09/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.471-472.43.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    Preparation of CF/BR Composite Used for Electromagnetic Shielding (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 47-50 (June 2008), p. 980-983 
    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 carbon fiber (CF) reinforced butadiene rubber (BR) electromagnetic shieldingcomposite has been prepared by mechanical agitation and roll mixing methods. The compositeshave been characterized and tested. As shown in the experimental results, the mechanical propertieswas increased with the increase of CF, and the electromagnetic shielding effectiveness (SE) of BRbased composite with 15 wt% CF content has been tested, the maximum SE was about 60 dB
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/41/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.47-50.980.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    Study on the Testing Technology of Main Residual Stress of Metal Sheet Based on Soft X-Ray Diffraction Stress Analyzer (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 315-316 (July 2006), p. 264-268 
    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: For the characteristics of soft X-ray stress testing technology, a formula to resolve mainresidual stress is deduced based on analyzing the relationship between main residual stress andnormal stress of different sections. The distribution of main stress of laser shock forming TA2 metalsheet is studied combined with the experimental study on the determining residual stress with soft Xray diffraction analyzer. The result shows that testing and calculating main residual stress is animportant approach to study the deformation law of sheet metal material
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/51/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.315-316.264.pdf
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  • 7
    Electronic Resource
    Electronic Resource
    Study of Interfacial Bonding Strength of Coat Based on XRD (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 532-533 (Dec. 2006), p. 9-12 
    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/2011/0528/02/14/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.532-533.9.pdf
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  • 8
    Electronic Resource
    Electronic Resource
    Laser Marking System of 3D Nondestructive Anti-Counterfeiting Identifiers Based on Liquid Crystal Mask (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 532-533 (Dec. 2006), p. 600-603 
    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 theoretical researches on fabrication, measurement and identification of lasermarking system of 3D(three-dimension) anti-counterfeiting identifiers have been done in this paper.3D identifiers were fabricated and 3D identifiers’ modelings were reconstructed, and binary codingof gray images were encoded by programmable control of liquid crystal mask, spatial modulating oflaser beam and photolithography fabrication technics. We regarded the depth of 3D identifiers asanti-counterfeiting information, and the original marking data and anti-counterfeiting informationare saved in remote database server by database technology and computer network technology，sotrue produces can be distinguished from fake through network. The basic theory of 3Dnondestructive anti-counterfeiting identifiers based on liquid crystal mask was built, and a newtechnology of creating 3D anti-counterfeiting identifiers by laser shock wave was set up, whichdiffers entirely from marking by laser ablation (or laser thermal effect). A new high-efficiencytheory of detecting and identifying on 3D anti-counterfeiting identifiers by 3D identifiers’reconstruction and binary coding was set up. The study enriches dynamic plastic deformation theoryof partial high-strain-rate and anti-counterfeiting design & manufacturing theory which is also ahighlight based on advanced manufacturing theory of mechanical effect on laser shock wave
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/14/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.532-533.600.pdf
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  • 9
    Electronic Resource
    Electronic Resource
    Study on Mechanism and Experiment of Engine Cylinder by Laser Honing (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 329 (Jan. 2007), p. 315-322 
    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 diesel engine cylinder was processed by laser honing (LH) device, the structuremorphology was observed with scanning electric mirror (SEM), and lubricant consumes and wearperformances were measured, at the same time the mechanism of LH and effects of laser parameterson LH results were analyzed. The experimental results are shown that LH is a kind of phasetransformation treatment by laser, which processes a hardening belt in the certain distributing formon the work-piece surface, and forms the hardness distribution of soft and hard materialalternatively; LH may lower the engine oil consumes 30%-60%, and reduce the pollution of thecatalyst machine, and lower the grain let of the engine oil 25%-30%. LH intentionally machines thegrain cave, which has the certain angle, depth, and width etc.. The surface microcosmic sculptinghas the lubricating function for usage process, and storage and transport lubricant, which improvesthe rubbing condition, then lower the part wear and increase the other performances. Theshort-wave laser is more applicable to the LH process, which improves the lubrication condition,and increases the service life of the engine and the efficiency, and lowers the engine oil consumes
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/52/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.329.315.pdf
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  • 10
    Electronic Resource
    Electronic Resource
    Nonstationary pandom vibpation analysis of linear elastic structures with finite element method (1982)
    Springer
    Applied mathematics and mechanics 3 (1982), S. 817-826 
    Details
    ISSN: 1573-2754
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Mathematics , Physics
    Notes: Abstract At present, the finite element method is an efficient method for analyzing structural dynamic problems. When the physical quantities such as displacements and stresses are resolved in the spectra and the dynamic matrices are obtained in spectral resolving form, the relative equations cannot be solved by the vibration mode resolving method as usual. For solving such problems, a general method is put forward in this paper. The excitations considered with respect to nonstationary processes are as follows: $$P(t) = \left\{ {P_1 (t)} \right\},{\text{ }}P_1 (t) = a_1 (t)P_1^0 (t),$$ a1(t) is a time function already known. We make Fourier transformation for the discretized equations obtained by finite element method, and by utilizing the behaviour of orthogonal increment of spectral quantities in random process[1], some formula of relations about the spectra of excitation and response are derived. The cross power spectral denisty matrices of responses can be found by these formulas, then the structrual safety analysis can be made. When a(1)=1 (i=1.2, ...,n), the method stated in this paper will be reduced to that which is used in the special case of stationary process.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01895336
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