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  • 1
    Electronic Resource
    Electronic Resource
    Numerical Simulation on Rolling Contact Fatigue with Dent at Rolling Surface (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 353-358 (Sept. 2007), p. 1094-1097 
    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 work has investigated the effect of spherical dent on rolling contact fatigue (RCF). A3-D finite element simulation model of bearing rolling contact incorporating critical plane approachhas been developed to study the fatigue failure location. It was found that the fatigue failure locationswere significantly influenced by the dent. The calculation results are in good agreement with theexperimental results and comparable with the results from the published literatures in which 2-Dmodels were generally used
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/55/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.353-358.1094.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    XPS Analysis of Silicon Oxycarbide Formed on the Surface of Rf-Sputter Deposited SiC Thin Films (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 353-358 (Sept. 2007), p. 1871-1874 
    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: Sputter deposited SiC films with and without annealing were characterized using X-rayphotoelectron spectroscopy (XPS). A complex transition layer, containing silicon oxycarbide(SiCxOy), between the SiO2 layer grown during extended exposure to ambient air or annealing andSiC substrate was investigated. Furthermore, the presence of excessive amorphous carbon wasdetected in the near-surface region for annealed sample. We justified the differences of compositionand chemical bonding in these two oxide layers in terms of different oxidation kinetics involved
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/55/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.353-358.1871.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Fatigue Property for the Powder Metallurgy Beryllium-Aluminum Composite Materials (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 353-358 (Sept. 2007), p. 207-210 
    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
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/55/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.353-358.207.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Experimental Study of the Effects of Surface Defects on Rolling Contact Fatigue Behavior (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 353-358 (Sept. 2007), p. 254-257 
    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: Rolling contact fatigue (RCF) cracks initiated from surface and subsurface defects aretypical failure modes of bearing systems. In this paper, the effects of surface defects on RCFbehavior of M50NiL and M50 steels were studied experimentally. Artificial dents were introducedon the rolling surface by using Rockwell hardness tester. The influences of dent shape and dentshoulders were examined by thrust-type RCF tests. Surface cracks initiation, propagation andspalling were monitored by scanning electron microscope (SEM) observation. The results showedthat artificial dents reduce RCF lives of M50NiL and M50 steels with mineral oil lubrication. Thefatigue failure initiates at the surface defect with the effects of dent shape and dent shoulder.M50NiL steel has higher contact fatigue resistance than M50. The features of surface andsub-surface cracks propagation during RCF tests were also observed
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/55/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.353-358.254.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    Flow-Induced Corrosion Simulation on a Plate by Finite Element Methods (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 353-358 (Sept. 2007), p. 3116-3119 
    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: Flow-induced localized corrosion is regarded as one of the main degradation mechanismsof materials. As an initial step of the simulation of a pipe, a plate is chosen to simplify the problem. Inthis paper, finite element method is used to simulate the corrosion process in the plate by employingnonlinear geometry and physics equations of the material to describe the quasi-static process. Anelastic modulus iterative procedure was performed to obtain the material parameters in considerationof the nonlinear physical properties of corrosion. The effect of corrosion is then considered byintroducing a criterion between depth and time, calculating corrosion depth at progressive given time.Dead and live finite elements are employed to consider the invalidation of the material. Thus themovable boundary conditions can be taken into account and the dynamic status of corrosion can besimulated. Stress corrosion process under flowing fluid condition is analyzed and then the results ofrepresentative examples are compared with published results
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/55/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.353-358.3116.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    Numerical Simulation of Void Growth Induced Creep Rupture in HAZ at Elevated Temperature (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 33-37 (Mar. 2008), p. 441-448 
    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 structural welded joints after long-term service under elevated temperature, fractureoccurred mainly in the heat affected zone (HAZ). Recently, the nucleation and growth of creep voidsin the fine-grained HAZ of weldments, recognized as Type IV fracture, has become an importantproblem for ferritic heat resisting steel. In this paper, a new computational model was presented toanalyse the void growth induced creep damage development in HAZ. The new constitutive modelbased on continuum damage mechanics (CDM) equations is combined with amicromechanism-based model in order to account for the void growth process, which is differentfrom the previous studies of creep damage. Material properties used for the creep damagecomputations are fitted from actual creep test data. Basic benchmark tests were performed to verifythe new computational model. Then the model was used to study the creep damage development inthe welded joints where four different material properties, base material, coarse-grained HAZ,fine-grained HAZ, and weld material, are taken into account. The numerical simulation results forcreep lifetimes agreed well with the experimental results
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.33-37.441.pdf
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  • 7
    Electronic Resource
    Electronic Resource
    Experimental Investigation of the Size Effects on the Fracture Toughness and Tearing Modulus (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 33-37 (Mar. 2008), p. 35-40 
    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: Detailed experiments of fracture toughness in which SENB specimens of five differentthicknesses were included were carried out to investigate the size effect in the ductile to brittletransition temperature region. It is found that the fracture toughness of the upper shelf increases withthe thickness of the specimens with the similar geometry. While the fracture toughness of the lowershelf decreases with the thickness in the range of 4mm to 12mm and then drops up from 12mm to16mm with the appearance of shear lips which present the shearing fracture under the plane stressstate. The tearing modulus dJ/da which determines the resistance to stable crack growth increaseswith the increment of thickness and the reduction of the temperature. The results of the stresstriaxiality increasing with the reduction of the thickness explain well the experimental results
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.33-37.35.pdf
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  • 8
    Electronic Resource
    Electronic Resource
    Fatigue Behaviors of a NiCrAlYSi Coated Directionally Solidified Nickel Base Superalloy (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 33-37 (Mar. 2008), p. 229-236 
    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 fatigue behaviors of a directionally solidified (DS) nickel base superalloy, coated witha MCrAlY coating (NiCrAlYSi) were studied. Two kinds of tests were performed. One kind of testsare low cycle fatigue (LCF) test under strain control at different temperatures, another kind of testsare stress controlled LCF test with SEM-servo hydraulic testing machine for in situ crackingobservation. The results show that the effect of coating on LCF life of coating/substrate system wasrather different according to different strain levels and temperatures. The coating has no or less effecton LCF life under high strain range and the LCF life is governed by fatigue behavior of substrate inspite of the difference of temperature. However, when strain range is smaller, crack initiation andpropagation are observably affected by temperature, which leads to a shorter LCF life ofcoating/substrate system at 500ºC and a longer LCF life at 760ºC or 980ºC. This means the failure ofcoating/substrate system is dominated by the cracking of surface coating under low strain range. Thebrittleness at 500ºC lower than DBTT results in rapid stage II crack propagation. The crack initiationfrom coating surface was in situ observed at room temperature and 700 ºC and it was found thatcracks usually initiated from the surface roughness of coating and then propagate to failure. Thebrittleness and surface roughness are the basic acceptable causes leading to the early damage of acoating/substrate system
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.33-37.229.pdf
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  • 9
    Electronic Resource
    Electronic Resource
    The Analysis on the Low Cycle Fatigue Behavior of a Directionally Solidified Superalloy with Recrystallized Surface Layers (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 44-46 (June 2008), p. 43-50 
    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: Specimens of a directionally solidified superalloy with different shot peening pressurewere annealed at 1220oC in vacuum condition to get recrystallized surface layers with differentmicro-structures. Low cycle fatigue tests of these specimens were performed at room temperature and400oC by using an electrohydraulic load frame in the SEM system for real-time observation. Theinitiation and propagation of cracks were inspected and the influence of the micro-structure of therecrystallized layer on the material fatigue behavior was analyzed. The low cycle fatigue life of thespecimens depends mainly on the characteristics of the recrystallized layer. When the shot peeningpressure is lower, the recrystallized layer is thin and not integrated, and the fatigue life decreasesobviously in comparison with that of the specimen without recrystallized surface layer. When the shotpeening pressure increases, the recrystal grains are more integrated, and the fatigue life rises. Acomparison of the recrystallized layers between the blade surface and the specimen surface has beendone and it points that the incompact surface recrystal layer is very dangerous to gas turbine blades
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.44-46.43.pdf
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  • 10
    Electronic Resource
    Electronic Resource
    Damage Analysis of High Temperature Isothermal and Thermomechanical Fatigue on a TZM Alloy (1997)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 145-149 (Oct. 1997), p. 649-654 
    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
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/44/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.145-149.649.pdf
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