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  • 1
    Electronic Resource
    Electronic Resource
    On the importance of direct resistance heating in thermo-mechanical fatigue (1990)
    Springer
    International journal of fracture 46 (1990), S. 257-270 
    Details
    ISSN: 1573-2673
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract A computationally efficient method of determining the temperature distribution and stress intensity factor induced by the resistance heating method of cycling temperature in thermo-mechanical fatigue is presented. It is further used to evaluate the importance of the singularity of the heat source caused by the electric current. Results indicate the thermally induced stress intensity factor of cracked components cycled by the direct resistance method of heating increases with the frequency of the thermal loading and may become quite large at higher frequencies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00037156
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Estimating the importance of cyclic thermal loads in thermo-mechanical fatigue (1991)
    Springer
    International journal of fracture 47 (1991), S. 161-180 
    Details
    ISSN: 1573-2673
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract A method for evaluating the effect of cyclic thermal loading on crack tip stress fields is developed. In its development, advantage is taken of the periodic nature of fatigue loading and only harmonic loadings are evaluated. Formulating the problem in this way permits the extraction of time as an explicit variable and replaces its role with a dependence on the frequency of the thermal loading. The means for evaluating the effect of periodic loadings on crack tip stress fields is the stress intensity factor which is calculated from numerically defined stress and displacement fields using a path independent integral. Results obtained indicate that stress intensity factors of cracked components exposed to thermal fatigue conditions have a significant dependence on the frequency of the thermal cycle and the crack geometry. Numerical estimates for mode I thermal stress intensity have been obtained using thermal fatigue test data for a titanium alloy and can be as high as 25 percent of the critical mode I mechanical stress intensity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00042574
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    On stress intensities induced by direct resistance heating (1987)
    Springer
    International journal of fracture 33 (1987), S. 135-144 
    Details
    ISSN: 1573-2673
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Résumé On calcule pour un problème de modélisation le champ de température et l'intensité de contrainte de Mode I provoqué par un chauffage par résistance. Les résultats indiquent que, pour un courant électrique constant appliqué, l'intensité de contraintes est proportionnelle à la longueur d'une fissure à la puissance 5/2. En conséquence, l'effet d'un chauffage local devient spécialement important lorsqu'on augmente la longueur de fissure, et peut, s'il est ignoré, induire des erreurs graves au cours d'essais de fatigue thermique de sévérité accrue qui recourent au chauffage direct par effect Joule.
    Notes: Abstract The temperature field and mode I stress intensity caused by resistance heating are calculated for a model problem. The results indicate that, for a constant far-field electric current, the stress intensity is proportional to the crack length to the power 5/2. Consequently, the effect of localized heating becomes especially important as the crack length increases and may, if ignored, cause significant errors during the more severe thermal fatigue tests that utilize direct resistance heating.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00033745
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    Paper (German National Licenses)
    Fulltext
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