A Computer-Aided Image System for Analyzing Cracks Created by Nailing in Wood

    Volume 18, Issue 2 (March 1990)

    ISSN: 0090-3973

    CODEN: JTEOAD

    Page Count: 7


    Lau, PWC
    Research Scientist and Senior Technologist, Eastern Laboratory, Forintek Canada Corp., Ottawa, Ontario

    Tardif, Y
    Research Scientist and Senior Technologist, Eastern Laboratory, Forintek Canada Corp., Ottawa, Ontario

    (Received 12 September 1988; accepted 11 September 1989)

    Abstract

    Initial crack length is an important parameter in fracture mechanic studies. Driving a nail into wood causes cracks to form which are the bases for subsequent crack development as a result of loading or drying. This report describes a computer-aided image system with which the induced crack size and shape were characterized. Typical examples of measurements of cracks as affected by species, nail type, and initial wood moisture content are also presented. Comparisons between computer-generated images and a reference test pattern indicate that the method is accurate. Crack sizes and shapes were seen to be affected by all the parameters investigated. Crack propagation tends to be at its maximum near or at the nail-exit face but can occur anywhere within the crack profile.


    Paper ID: JTE12464J

    DOI: 10.1520/JTE12464J

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    Author
    Title A Computer-Aided Image System for Analyzing Cracks Created by Nailing in Wood
    Symposium , 0000-00-00
    Committee D07