SYMPOSIA PAPER Published: 01 January 1978
STP38642S

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

Source

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.

Author Information

Masuoka, M
Osaka Prefectural Industrial Research Institute, Enokojima Kamino-cho, Japan
Nakao, K
Osaka Prefectural Industrial Research Institute, Enokojima Kamino-cho, Japan
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Developed by Committee: C24
Pages: 342–361
DOI: 10.1520/STP38642S
ISBN-EB: 978-0-8031-5546-6
ISBN-13: 978-0-8031-0272-9