Volume 2, Issue 7 (July 2005)

    Characterizing Dynamic Fracture Behavior of Adhesive Joints under Quasi-Static and Impact Loading

    (Received 12 October 2004; accepted 27 December 2004)

    Published Online: 2005

    CODEN: JAIOAD

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    Abstract

    An experimental evaluation of the dynamic fracture properties of an automotive epoxy is presented. Pronounced stick-slip behavior was observed in both quasi-static and impact tests of aluminum and composite adherends bonded with this adhesive. An experimental technique for conducting low speed impact of adhesively bonded automotive composite joints is presented. Based on the use of a modified drop tower, mode I, II, and mixed mode values for critical energy release rate were determined to create a fracture envelope for the composite/epoxy system. Because load measurements are erratic and unreliable at higher test rates, displacement-based relationships were used to quantify these energy release rates. Displacement data were collected with an imaging system that utilizes edge detection to determine displacement profiles, end displacements, and opening displacements where applicable. Because of the resolution of the image-based approach being used, determining crack length experimentally is difficult. As a result, numerical methods based on edge detection algorithms were developed to objectively determine the crack length based on the available experimental data in mode I, II, and mixed mode I/II configurations.


    Author Information:

    Simón, JC
    Mechanical Engineering, Virginia Tech, Blacksburg, VA

    Johnson, E
    Professor Emeritus of Aerospace and Ocean Engineering, Virginia Tech, Blacksburg, VA

    Dillard, DA
    Professor of Engineering Science and Mechanics, Virginia Tech, Blacksburg, CA


    Stock #: JAI12955

    ISSN: 1546-962X

    DOI: 10.1520/JAI12955

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    Author
    Title Characterizing Dynamic Fracture Behavior of Adhesive Joints under Quasi-Static and Impact Loading
    Symposium Advances in Adhesives, Adhesion Science, and Testing, 2004-10-06
    Committee D14