Abstract
A refined optimal method consisting of the tandem application of frozen stress photoelasticity and high density moire interferometry for studying three dimensional effects in cracked bodies is briefly reviewed. It is then employed to measure the dominant eigenvalue at the right angle intersection of a straight front crack with a free surface under mode I loading. The variation of the eigenvalue through a transition zone near the free surface is also determined. The free surface result is found to be in agreement with analytical results.
Résumé
On expose brièvement une méthode optique consistant à appliquer en parallèle la photo-élasticité sous contraintes figées et l'interférométrie sur bandes de Moiré à hautes densités, pour l'étude des effets tridimensionnels dans les solides fissurés. On utilise ensuite cette méthode à la mesure de l'eigenvalue dominante à l'intersection suivant un angle droit d'un front de fissure droit avec une surface libre, sous une sollicitation de Mode I. On détermine également la variation de l'eigenvalue dans une zone de transition au voisinage de la surface libre. Le résultat relatif à cette dernière est en bonne concordance avec les résultats analytiques.
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Smith, C.W., Epstein, J.S. & Rezvani, M. Measurement of dominant eigenvalues in cracked body problems. Int J Fract 39, 15–24 (1989). https://doi.org/10.1007/BF00047436
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DOI: https://doi.org/10.1007/BF00047436