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  • 1
    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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  • 2
    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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  • 3
    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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  • 4
    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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  • 5
    Electronic Resource
    Electronic Resource
    Analyses on micro-fracture of crack tip under large deformation conditions (1990)
    Springer
    Acta mechanica solida Sinica 3 (1990), S. 13-26 
    Details
    ISSN: 0894-9166
    Keywords: void-containing material ; micro-fracture process ; constitutive equation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract In the present paper, Gurson's constitutive equation, which takes into account the development of voids, is used to study the behaviour of the material in the region near crack tip. Furthermore, the effect of void development on Young's modulus, which was not considered by Gurson, is taken into consideration. The analyses on void development, on stress distribution near crack tip, and on the variance of COD for the plane strain mode I problem are carried out with the large elastic-plastic deformation finite element method. The results are compared with those estimated from the Prandtl-Reuss constitutive equation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02205621
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  • 6
    Electronic Resource
    Electronic Resource
    Double-resonance spectroscopy of the high Rydberg states of HCO. V. Rovibronic interactions and l-uncoupling in the (010) manifold (2000)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 113 (2000), S. 5372-5383 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We report the ionization-detected absorption spectra of autoionizing Rydberg states converging to the (010) vibrational level of HCO+. Sharp second-photon resonances appear in transitions from first-photon-prepared originating states that have total angular momentum (less-spin) from N′=0 to 5, selected from the Σ+ and Σ− components of the (010) band of the 3pπ2Π Rydberg state. We systematically compare spectra in order to characterize observed resonances in terms of the good total angular momentum quantum number, N. Rydberg analysis establishes the convergence of series to detailed cation-core rotational quantum numbers, N+. Observed series are found to fit well with simulations employing a limited set of constant quantum defects (δ=1.062, 0.794, 0.606, 0.253, 0.015, 0.002, −0.027 and −0.076). The strengths of observed transitions as a function of initial and final total angular momentum provide a purely experimental indication of the appropriate assignment of the approximately good orbital angular momentum quantum number, l, for each series. Interactions between Rydberg orbital and core rotational angular momentum are found to conform with a coupling case intermediate between Hund's cases (b) and (d). Splitting patterns further assign certain features according to predominant case (b) composition. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1290032
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  • 7
    Electronic Resource
    Electronic Resource
    The profiles of the stokes parameters and the magnetic field vector
    Amsterdam : Elsevier
    Chinese Astronomy 4 (1980), S. 402-405 
    Details
    ISSN: 0146-6364
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0146-6364(80)90033-X
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  • 8
    Electronic Resource
    Electronic Resource
    On the use of seares' formulae in the determination of the direction of magnetic fields in sunspots
    Amsterdam : Elsevier
    Chinese Astronomy 3 (1979), S. 394-399 
    Details
    ISSN: 0146-6364
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0146-6364(79)90029-X
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  • 9
    Electronic Resource
    Electronic Resource
    On magnetic field gradients in sunspots
    Amsterdam : Elsevier
    Chinese Astronomy 4 (1980), S. 273-278 
    Details
    ISSN: 0146-6364
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0146-6364(80)90009-2
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  • 10
    Electronic Resource
    Electronic Resource
    Magneto-sensitive lines in the solar spectrum
    Amsterdam : Elsevier
    Chinese Astronomy 3 (1979), S. 258-272 
    Details
    ISSN: 0146-6364
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0146-6364(79)90015-X
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