Table of Contents
Indian Journal of Materials Science
Volume 2013, Article ID 187802, 4 pages
Research Article

Fracture Toughness Reliability in Polycarbonate: Notch Sharpening Effects

1DIMME, Departamento de Tecnología Mecánica, Escuela Superior de Ciencias Experimentales y Tecnología, Universidad Rey Juan Carlos, C/Tulipán, s/n, Móstoles, 28933 Madrid, Spain
2Centre Català del Plàstic, Universitat Politècnica de Catalunya, C/Colom 144, Terrassa, 08222 Barcelona, Spain

Received 10 October 2013; Accepted 27 November 2013

Academic Editors: W. Cantwell and A. Kajbafvala

Copyright © 2013 A. Salazar et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


The effect of the notch sharpening on the fracture toughness obtained under linear elastic fracture mechanics has been analyzed in an amorphous polycarbonate. The samples for fracture characterization were sharpened via the traditional contact steel razor blade technique and the noncontact femtosecond laser ablation technique. The values of the fracture toughness of the specimens sharpened through femtosecond laser ablation were lower than those measured on samples sharpened using a steel razor blade. Moreover, the former was in plane strain state, but the latter did not verify the size criterion. The damage produced ahead of the crack tip through plastic deformation in the steel razor blade sharpened samples over the lack of damage in the femtolaser sharpened specimens explains the differences in the fracture toughness. It has been proven that there is a relationship between the plastic deformation at the crack front and the stress state. This has been assessed through the application of a fracture criterion for dissipative systems with small scale yielding.