Date of Award

Fall 1989

Document Type

Thesis

Degree Name

Master of Science (MS)

Department

Mechanical & Aerospace Engineering

Program/Concentration

Engineering Mechanics

Committee Director

R. Prabhakaran

Committee Member

Mark J. Shuart

Committee Member

Zia Razzaq

Call Number for Print

Special Collections; LD4331.E57L67

Abstract

An analytical and experimental study to assess the effect of bending on the adhesive strain distributions in a stiffener-skin interface region is described. A one-dimensional beam analysis is derived using a variational approach. Parametric studies are conducted to assess the effects of stiffener, skin, and adhesive thickness and adhesive material nonlinearity on the adhesive layer extensional and shear strain distributions subjected to applied bending. Two experimental methods of measuring through-the-thickness extensional strains in an adhesive are investigated. One method involves measuring the changes in the resistance of a composite strain sensor subjected to applied tension and compression loads. The second method involves using small strain gages to measure the through-the-thickness extensional strains in the adhesive layer of an adhesively bonded specimen. Four adhesively bonded specimens were fabricated and tested in four-point bending. Two specimens were made of 6061-T6 aluminum alloy and two specimens were made from AS4/3502 graphite-epoxy. Experimental and analytical results for four adhesively bonded specimens are compared in this investigation. Good correlation between experimental and analytical trends of adhesive extensional strain distribution is found.

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DOI

10.25777/qb8r-8d43

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