Fracture behaviour of thermosetting polymers for ophthalmic lenses

In the worldwide market we found strongly positioned two thermosetting materials for ophthalmic lenses: CR-39 and Superfin. In this work, the fracture behaviour of both materials is studied through the application of Linear Elastic Fracture Mechanics (LEFM) using two geometries: double torsion and t...

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Bibliographic Details
Published in:Engineering failure analysis 2010, Vol.17 (1), p.4-10
Main Authors: Martinez, A B, Artus, P, Dursteter, J C, Arencon, D
Format: Article
Language:English
Subjects:
Double torsion
LEFM
Ophthalmic lenses
SENB
Thermosetting polymers
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Summary:In the worldwide market we found strongly positioned two thermosetting materials for ophthalmic lenses: CR-39 and Superfin. In this work, the fracture behaviour of both materials is studied through the application of Linear Elastic Fracture Mechanics (LEFM) using two geometries: double torsion and three point bending. The fracture toughness has been determined by the double torsion technique. CR-39 showed a continuous and stable crack propagation, whereas Superfin exhibited a stick-slip behaviour whose instability decreased when the strain rate increased. The values at crack initiation agreed with the fracture toughness results of single edge notched tests in bending geometry.
ISSN:1350-6307
1873-1961
DOI:10.1016/j.engfailanal.2008.11.002