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  • 1
    Electronic Resource
    Electronic Resource
    Morphology Evolutions of the Short Fatigue Crack Propagation of 1Cr18Ni9Ti Weld Metal (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 353-358 (Sept. 2007), p. 46-49 
    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: Surface and depth morphology evodslutions of short crack propagation of 1Cr18Ni9Tiweld metal are investigated. In accordance with the previous effective short fatigue crack (ESFC)criterion, attention is paid on the formation zone of the dominant ESFC (DESFC), which resultedfinally in the specimen failure, in micro-structural short crack (MSC) regime and then, the tip zone(s)ahead of the DESFC in physical short crack (PSC) regime. Results show that in MSC regime thesurface ESFCs were imitated from the distributed randomly delta ferrite bounds separated fromaustenite matrix. The initiated ESFCs on surface propagated perpendicularly to loading axle. But indepth direction, the initiated ESFCs grew first similarly to the surface behaviour but lately, tended tobe perpendicularly to the formation direction of the material columnar grain structure. When sizes ofsome longer ESFCs reached around the material maximum barrier size, coalescence occurred to forma true DESFC. In PSC regime the surface DESFC grew almost perpendicularly to loading axle. But indepth direction, it grew first perpendicularly to the formation direction of the columnar grain structureand then, tended to having 45 degree angle to the loading axle. Obviously, the evolutions werestrongly affected by interactions between the load and the microstructures, especially, the columnargrain structure
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/55/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.353-358.46.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Statistical Reconstruction of the One-Dimensional Mechanical and Fatigue Strengths (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 353-358 (Sept. 2007), p. 2493-2496 
    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 Monte-Carlo simulation method for the reconstruction of one-dimensional probabilisticmechanical and fatigue strengths is developed to realize reliability analysis at arbitrary probability andconfidence levels. This method is valid to the cases of the probabilistic parameters given at specialprobabilities (Ps) or probability-confidences (P-Cs). To overcome the shortage of commonsimulations with numerous samples which is out of true production practice, a simulation policy isnewly suggested with 7 to 20 samples for material small specimens and, at most 10 for structuralspecimens and 5 percentages for the error of simulated parameters fitting the original ones. Details ofthe method in practice are studied for the six possible statistical distributions i.e. normal, lognormal,three-parameter Weibull, two-parameter Weibull, maximum value, and minimum value ones. Thereconstructions of the fatigue limits of 10 Chinese engineering materials have indicated theavailability and feasibility of the present method
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/55/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.353-358.2493.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Reconstruction of the Material Probabilistic S-N Relations with Given Confidence (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 353-358 (Sept. 2007), p. 66-69 
    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: Because of the huge cost involved in data acquisition, probabilistic S-N relations should begiven on a wide applicable sense to perform the reliability analysis at arbitrary survivalprobability-confidence (P-C) level. However, some existent fatigue databases give the materialprobabilistic S-N relations only with several fixed P-C levels. To realize the reliability analysis on asense of arbitrary P-C level, a Monte Carlo simulation method is presented for reconstruction of therelations. Test data are re-gotten by a method under the new simulation policy that matchingproduction practice according to original statistical parameters. Details are given with respect to thepossible cases of known conditions. The relations are finally determined by maximum likelihoodestimation on a general model to realize the analysis at arbitrary P-C level. Reconstruction of therelations for 60Si2Mn spring steel has indicated the availability and feasibility of present method
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/55/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.353-358.66.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    The Influence of HAZ on Fatigue Life of 16Mn Steel (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 44-46 (June 2008), p. 323-328 
    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: In order to understand the influence of Heat-Affected Zone (HAZ) on fatigue properties of16Mn steel, a series of cyclic torsional tests were conducted on 16Mn weld metal, the base metal, andthe HAZ metal. The specimens of 2mm diameter were uniformly-spaced taken from a bulk 16Mnplate, which included a V-style welded joint in the center, and the space for each specimen was 4mm.From cyclic fatigue tests performed on specimens at different positions, one can observe that thefatigue damage evolution in the HAZ is faster than those in the weld and the base metal, i.e., HAZ hasa significant effect on fatigue life of 16Mn. In addition, the peak stress decline curves of HAZspecimens in different rows are considerably diversified, but the damage evolution and fatigueproperties of HAZ metal are similar in spite of their locations
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.44-46.323.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    Hybrid Fatigue Analysis Method for Railway Carbody Structure (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 44-46 (June 2008), p. 733-738 
    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: Railway vehicle structure fatigue life consumption monitoring can be used to determinefatigue damage by directly or indirectly monitoring the loads placed on critical vehicle componentssusceptible to failure from fatigue damage. The sample locomotive carbody structure was used forthis study. Firstly, the hybrid fatigue analysis method was used with Multi-Body System (MBS)simulation and Finite Element Method (FEM) for evaluating the carbody structure dynamic stresshistories. Secondly, the standard fatigue time domain method was used in fatigue analysis softwareFE-FATIGUE and MATLAB WAFO (Wave Analysis for Fatigue and Oceanography) tools. Andcarbody structure fatigue life and fatigue damage were predicted. Finally, and carbody structuredynamic stress experimental data was taken from this locomotive running between Kunming-Weishefor this analysis. The data was used to validate the simulation results based on hybrid method. Theanalysis results show that the hybrid method prediction error is approximately 30.7%. It alsoillustrates that the fatigue life and durability of the locomotive can be predicted with this hybridmethod. The results of this study can be modified to be representative of the railway vehicle dynamicstress test
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.44-46.733.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    Progresses on the Fatigue Reliability Research of China Railway Vehicles in Recent Decade (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 44-46 (June 2008), p. 1-14 
    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: Main progresses are reviewed and prospected from four elements on the fatigue reliabilityanalysis research of China railway vehicles during recent decade. First, material fatigue database hasbeen moderately developed and an emphasis was placed on the systemized fatigue properties. Second,a great of on-line inspections have been performed on the wheel-track contact forces and servicestresses of key structures. A reliable vehicle dynamics simulation technique has been developed forsimulating the contact forces and a multi-variable quadratic regression approach has been proposed tocalculate the service stresses for recuing imperfect inspections. Third, systemized fatigue reliabilityresearches have been made on improved fatigue limit measurement, probabilistic S-N curves,scale-deduced fatigue behavior, design Goodman-Smith diagram, and reliability analysis approach toaddress on the real super-long life of railway vehicle’s structures. Fourth, a critical safety state theoryis established to address the time-dependent off-round wheel wear and the interactive fatigue damagebetween components. Fatigue cracking threshold measurement is improved. And a fatigue crackgrowth modeling is developed to cover entire physical process from the threshold to the fracture. Theaxle critical safety sizes are determined under considering the off-round wheel and the wheel criticalsafety wear sizes are measured to ensure the axle expected safety life. All researches are valuable tobe further studied
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.44-46.1.pdf
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  • 7
    Electronic Resource
    Electronic Resource
    Fatigue Fracture Behavior of Bearing Steel GCr15 in Very High Cycle Regime (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 44-46 (June 2008), p. 119-126 
    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: In order to investigate the fatigue behaviors in very high cycle fatigue regime of bearingsteel GCr15 (Chinese standard), cantilever-type rotary bending fatigue test was carried out, by usingan hourglass-shaped specimen. As a result, the S-N data were classified into surface grinding flawor inclusion induced fracture mode, subsurface inclusion without ‘granular-bright-facet’ (GBF) areainduced fracture mode and subsurface inclusion with GBF area induced fracture mode. Formationof a GBF area was clearly observed in the vicinity of subsurface inclusion on the fracture surfaceruptured at high- cycle fatigue regime. The cause of the S-N curves of GCr15 obtained by thisexperiment continuously decreased, which is different from the common ‘duplex S-N’ curve.Experiments on fracture surface was carried out based on the ‘dispersive decohesion of sphericalcarbide’ model aimed to clarify the mechanism of the formation of GBF area
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.44-46.119.pdf
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  • 8
    Electronic Resource
    Electronic Resource
    A Short Fatigue Crack Growth Law for 1Cr18Ni9Ti Weld Metal (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 324-325 (Nov. 2006), p. 571-578 
    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 series of uniaxial-compression tests were conducted on some representative brittle rockspecimens, such as granite, marble and dolerite. A multi-channel, high-speed AE signal acquiringand analyzing system was employed to acquire and record the characteristics of AE events anddemonstrate the temporal and spatial distribution of these events during the rupture-brewingprocess. The test result showed that in the primary stage, many low amplitude AE events weredeveloped rapidly and distributed randomly throughout the entire specimens. In the second stage,the number of AE increased much slower than that in the first stage, while the amplitude of mostAE events became greater. Contrarily to the primary stage, AE events clustered in the middle areaof the specimen and distributed vertically conformed to the orientation of compression. The mostdistinct characteristic of this stage was a vacant gap formed approximately in the central part of thespecimen. In the last stage, the number of AE events increased sharply and their magnitudeincreased accordingly. The final failure location coincidently inhabited the aforementioned gap. Themain conclusion is that most macrocracks are developed from the surrounding microcracks existedearlier and their positions occupy the earlier formed gaps, and the AE activity usually becomesquite acute before the main rupture occurs
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/52/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.324-325.571.pdf
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  • 9
    Electronic Resource
    Electronic Resource
    Reconstruction of the Material Probabilistic S-N Relations under Fatigue Life Following Lognormal Distribution I-without Given Confidence (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 324-325 (Nov. 2006), p. 1043-1046 
    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: Fatigue reliability theory has recently verified that the sampling size related effect shouldbe taken into account by confidence (C). However, most of the historic probabilistic S-N curves aregiven to only consider the scattered regularity effect by survival probability (P). Therefore, areconstruction method of the historic curves is investigated to consider the sampling size effect. Aneffort is made on addressing the true production that the sampling size is less than 20 for materialspecimens and 10 for structural component specimens. A Monte Carlo simulation approach is firstestablished to reconstruct the test S-N data. And then, the P-C-S-N curves are reconstructed with ageneral maximum likelihood principle. The practice for 40Cr steel has clearly indicated that, beyondall doubt, the reconstructed curves has overcome the shortages of the historic data
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/52/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.324-325.1043.pdf
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  • 10
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    Unknown
    Quantum defect theory of the molecular photoabsorption process: NO spectra in the energy region 9.3–22.0 eV (2000)
    American Institute of Physics
    Details
    Publication Date: 2000-07-01
    Print ISSN: 0021-9606
    Electronic ISSN: 1089-7690
    Topics: Chemistry and Pharmacology , Physics
    Published by American Institute of Physics
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