Abstract
The R-curve method was used to characterize the stable crack growth and the unstable ductile fracture of 3 mm thick polycarbonate sheets. In order to delimit the field of application of this method, several parameters describing the crack growth resistance were employed. The effect of specimen size and geometry was also studied. Besides limitations linked to test specimens size, the different parameters used are shown to aptly describe the tearing process of this material. When the plane stress region is dominant, the J-integral appears to be as a parameter well adapted to characterize ductile fracture.
Résumé
On a utilisé la méthode de la courbe R pour caractériser la croissance stable d'une fissure et la rupture ductile instable dans le cas de feillards de polycarbonate de 3 mm d'épaisseur. Afin de délimiter le champ d'application de cette méthode, on a utilisé divers paramètres décrivant la résistance à la propagation de la fissure. Les effets de la taille de l'éprouvette et de sa géométrie ont été également étudiés. On montre que les différents param`etres utilisés indiquent les limitations propres à la taille des éprouvettes et décrivent bien le processus d'arrachement qui caractérise le comportement de ce matériau. Lorsqu'il y a prédominance d'une région d'état plan de tension, l'intégrale J apparaît être un paramètre bien adapté à la caractérisation d'une rupture ductile.
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Schmit, F., Bouvart, D. & Francois, D. Ductile fracture characterization of polycarbonate by the R-curve method. Int J Fract 43, 83–96 (1990). https://doi.org/10.1007/BF00036178
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DOI: https://doi.org/10.1007/BF00036178