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On stress intensities induced by direct resistance heating

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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.

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.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Carnegie Mellon University, 15213, Pittsburgh, PA, USA

    S. E. Cunningham, J. H. Griffin & G. B. Sinclair

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  1. S. E. Cunningham
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  2. J. H. Griffin
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  3. G. B. Sinclair
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Cunningham, S.E., Griffin, J.H. & Sinclair, G.B. On stress intensities induced by direct resistance heating. Int J Fract 33, 135–144 (1987). https://doi.org/10.1007/BF00033745

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  • DOI: https://doi.org/10.1007/BF00033745

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