STP593

    Rate and Time Dependent Failure of Structural Adhesives

    Published: Jan 1975


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    Abstract

    Studies on two adhesives (Metlbond 1113 and 1113-2) identified as having important applications in the bonding of composite materials are presented. A testing program to ascertain stress-strain, strain-rate, time, yield, and/or failure behavior of these materials in bulk form using uniaxial tensile constant strain-rate, creep, and relaxation tests is described. The stress-strain behavior of each material is shown to be significantly rate dependent. Further, it is shown that a rate dependent stress whitening (crazing) phenomenon occurs prior to either yield or fracture. A region of linear elasticity, a region of viscoelasticity, and the onset of yielding are identified in the stress-strain behavior. The linear elastic limit and the yield point are shown to be rate dependent and agree well with an empirical equation proposed by Ludwik. A creep to failure phenomenon is shown to exist and is correlated with a delayed yield equation proposed by Crochet. Analytical predictions based on a modified Bingham model are shown to agree well with experimental stress-strain strain-rate data. Analytical predictions based on a modified Ramberg-Osgood equation are also shown for comparison purposes. Information regarding rate and time dependent Poisson's ratios is also presented.

    Keywords:

    fracture properties, composite materials, stresses, adhesives, bonding strength


    Author Information:

    Brinson, HF
    Associate professor, research assistant, and associate professor, Virginia Polytechnic Institute and State University, Blacksburg, Va.

    Renieri, MP
    Associate professor, research assistant, and associate professor, Virginia Polytechnic Institute and State University, Blacksburg, Va.

    Herakovich, CT
    Associate professor, research assistant, and associate professor, Virginia Polytechnic Institute and State University, Blacksburg, Va.


    Paper ID: STP34798S

    Committee/Subcommittee: D30.04

    DOI: 10.1520/STP34798S


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