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A Comparative Analysis of Brittle Fracture in Amorphous and Polycrystalline Materials

Published online by Cambridge University Press:  26 February 2011

A. Calomino ,
D. Brewer ,
A. Kim  and
A. Chudnovsky
D. Brewer
Affiliation:
NASA Lewis Research Center, Structures Division, Cleveland, OH 44135
A. Chudnovsky
Affiliation:
University of Illinois at Chicago, CEMM Department, Chicago, IL 60601
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Abstract

The fracture results of an amorphous epoxy resin and polycrystalline silicon nitride tested under monotonically increasing crack mouth opening displacements were compared. A conventional compact tension specimen was used for the epoxy. A new loading system and specimen was designed for the ceramic to permit stable crack growth. Tests conducted on both materials revealed multiple events of subcritical crack growth, dynamic initiation, dynamic growth, and subsequent arrest. The elastic energy release rate at initiation, G11, and arrest, G1a, was evaluated for each event. The value of G11 was found to be higher than G1a for both materials.

Also common was the systematic existence of slow growth prior to dynamic initiation. Additionally, both materials showed differences between the fracture surface morphology for slow, 10-6 m/s, and fast, 103 m/s, growth. Although a constant G1a was recorded for the epoxy, large scatter and a possible trend was recorded for G1a in the ceramic.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 278: Symposium W – Computational Methods in Materials Science , 1992 , 165
Copyright
Copyright © Materials Research Society 1992

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