STP640

    Effect of Aspect Ratio on Tensile Bond Strength for Butt Joint of Internal Fracture—Theoretical and Experimental Analysis

    Published: Jan 1978


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    Abstract

    A general formula for the tensile bond strength of a butt joint in the case of internal fracture is given in terms of a simplified model constructed from measurable parameters. The stress distribution under large plastic deformation is obtained from the stress equilibrium on the horizontal symmetry plane of the adhesive film. The yield condition of Mises or Tresca was employed. The theoretical formula shows good agreement with experimental results. The contraction ratio of lateral contractive strain to longitudinal tensile strain at yielding of the adhesive is given as a function of the aspect ratio and is independent of the adhesive materials used. The empirical relation between the bond strength and the contraction ratio is expressed by a single curve and also is independent of the adhesive materials used. The theoretical and empirical equations obtained indicate that the bond strength for the butt joint of internal fracture depends on both the yield strength and the aspect ratio of the adhesive.

    Keywords:

    butt joints, adhesion, thin films, internal fracture, tensile bond strength, stress analysis, aspect ratio, yield strength, contraction ratio


    Author Information:

    Masuoka, M
    Bachelor of science and doctor of science, Osaka Prefectural Industrial Research Institute, Enokojima Kamino-cho,

    Nakao, K
    Bachelor of science and doctor of science, Osaka Prefectural Industrial Research Institute, Enokojima Kamino-cho,


    Paper ID: STP38642S

    Committee/Subcommittee: C24.30

    DOI: 10.1520/STP38642S


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