Title page for ETD etd-07132000-14580030


Type of Document Master's Thesis
Author Williams, NuRocha Lyn
URN etd-07132000-14580030
Title Elastic Analysis of the Loop Tack Test for Pressure Sensitive Adhesives
Degree Master of Engineering
Department Civil Engineering
Advisory Committee
Advisor Name Title
Plaut, Raymond H. Committee Chair
Dillard, David A. Committee Member
Holzer, Siegfried M. Committee Member
Keywords
  • Pressure Sensitive Adhesive
  • Adhesion
  • Elastica
  • Loop Tack Test
Date of Defense 2000-06-29
Availability unrestricted
Abstract
The loop tack test measures the tack (instant grip) of an adhesive. An analytical model of

this test seems to be lacking and is the subject of this research. The strip is investigated

using several mathematical formulations, and the solutions are obtained numerically.

The loop is created from a flexible elastic strip that is bent into a teardrop shape, with its

ends clamped together. The strip is tested in a cycle, in which the loop is first pushed

onto the surface, compressing the adhesive. Then the loop is pulled up, and gradually

debonds from the substrate. The loop is assumed to be nonlinearly elastic and

inextensible.

The mechanics of the loop tack test are studied in order to determine the impact of

various factors on adhesive performance. These factors include the stiffness of the

backing, the stiffness and thickness of the adhesive, the elongation of the adhesive before

debonding, and the contact time.

The relationship between the applied force and the vertical deflection of the loop's ends

is determined, as well as that between the applied force and the contact length. Also, the

maximum "pull - off" force needed to remove the substrate from the loop is obtained

from the results. Shapes of the loop during the cycle are found.

This research will increase understanding of the behavior of the adhesive and backing

during the loop tack test. With the computer model that has been developed, any set of

parameters and conditions can be analyzed, and improvements can be made in the test

procedure.

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