Date of Award

Spring 1980

Document Type

Thesis

Degree Name

Master of Science (MS)

Department

Mechanical & Aerospace Engineering

Program/Concentration

Engineering Mechanics

Committee Director

Earl A. Thornton

Committee Member

R. Prabhakaran

Committee Member

W. B. Fichter

Call Number for Print

Special Collections; LD4331.E57E86

Abstract

One of the possible failure modes in adhesively bonded joints is cyclic debonding -- progressive separation of the adherends by cyclic failure of the adhesive bond. In this study cyclic debonding in an adhesively bonded crack-lap shear specimen has been investigated by means of a linear elastic finite-element analysis and a series of constant­ amplitude axial fatigue tests. The primary purpose of this study was to test the hypothesis that cyclic debonding is due largely to tensile peel stresses in the adhesive.

The results of this study have indicated that not all of the tensile peel stresses in the adhesive have to be over­ come in order to stop cyclic debonding, i.e., a threshold value of the peel stress exists, Since the test series in­ volved only one cyclic load level, and since the finite­ element analysis did not include potentially significant nonlinear material and geometric effects, definite conclusions about a peel stress threshold must await a more re­ fined stress analysis as well as cyclic debond tests at additional load levels.

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DOI

10.25777/5w2y-ja98

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