Volume 18, Issue 1 (January 1990)

    Applicability of Modified J as a Fracture Parameter for Polycarbonate

    (Received 24 February 1989; accepted 22 June 1989)

    CODEN: JTEOAD

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    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
    Graduate Research Assistant and Professor, Mechanical Properties Research Laboratory, School of Materials Engineering, Georgia Institute of Technology, Atlanta, GA

    Saxena, A
    Graduate Research Assistant and Professor, Mechanical Properties Research Laboratory, School of Materials Engineering, Georgia Institute of Technology, Atlanta, GA

    Ernst, HA
    Associate Professor, School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA


    Stock #: JTE12446J

    ISSN: 0090-3973

    DOI: 10.1520/JTE12446J

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    Author
    Title Applicability of Modified J as a Fracture Parameter for Polycarbonate
    Symposium , 0000-00-00
    Committee E08