Journal Published Online: 01 January 1990
Volume 18, Issue 1

Applicability of Modified as a Fracture Parameter for Polycarbonate

CODEN: JTEVAB

Abstract

The applicability of modified J-integral, JM, as a fracture parameter for plain and impact-modified polycarbonate was examined. Specific issues were:

1. Influence of the non-unique tensile stress-strain behavior, which is characteristic of these materials, on the applicability of JM.

2. Methods of estimating JM in fracture specimens given the load—load-point deflection diagram.

3. Fracture mechanisms that cause ductile and brittle crack growth in this class of materials.

Crack growth resistance (JM-R) curves were obtained from compact-type (CT) specimens of multiple sizes and specimens of another geometry (single edge notch [SEN]). The JM-R curves were consistent for crack extensions up to 2.5 mm for CT specimens of various sizes and were independent of geometry for crack initiation and a limited amount of crack growth (1.5 mm). The JM-R curve for toughened polycarbonate showed a considerably higher resistance to ductile tearing than that of the plain polycarbonate. The fracture mechanisms in both types of materials were characterized using a scanning electron microscope.

Author Information

Wert, MJ
Mechanical Properties Research Laboratory, School of Materials Engineering, Georgia Institute of Technology, Atlanta, GA
Saxena, A
Mechanical Properties Research Laboratory, School of Materials Engineering, Georgia Institute of Technology, Atlanta, GA
Ernst, HA
School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA
Pages: 13
Price: $25.00
Related
Reprints and Permissions
Reprints and copyright permissions can be requested through the
Copyright Clearance Center
Details
Stock #: JTE12446J
ISSN: 0090-3973
DOI: 10.1520/JTE12446J