Abstract
Shadow visualization has been used to study the stress field, the strain field, and the Young's modulus field around a running crack tip in a strain-rate-sensitive body. A typical frequency is associated with the passing of the stress field of the running crack. Calculations of the caustics show that variations in the modulus do not much affect the stress distribution but change the strain distribution around the moving crack tip.
Résumé
On a utilisé la méthode de visualisation ombroscopique pour mettre en évidence les champs de contrainte, de déformation et de module d'élasticité local au sommet d'une fissure dont la vitesse de propagation varie. On a associé aux contraintes autour d'une fissure qui se propage un spectre de fréquence caractéristique. En tenant compte, dans le calcul de l'image ombroscopique, du module d'Young local variable en fonction de la vitesse du sommet de la fissure, on a montré que les variations du module modifient peu la distribution des contraintes mais changent la distribution des déformations autour du sommet de la fissure en propagation.
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Schirrer, R. The effects of a strain-rate-dependent Young's modulus upon the stress and strain fields around a running crack tip. Int J Fract 14, 265–279 (1978). https://doi.org/10.1007/BF00034688
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DOI: https://doi.org/10.1007/BF00034688