New and Improved Tests for Adhesion.

Abstract

Three methods are discussed for measuring the work G sub a required to break a bond: Outwater's double-torsion test for long plates, bonded together; a pull-off test for an elastic strip adhering to a rigid surfaces; and a blister test for an adhering elastic layer. The pull-off force F or blow-off pressure P is given by: F4(or P4) is directly proportional to KG sub a cubed where is the tensile stiffness of the detaching layer. This unusual dependence arises from the non-linear (cubic) relation between force or pressure and pull-off angle theta or blister height y. However, the products F theta and Py give direct measures of G sub a, independent of stiffness and the extent of detachment. Keywords: Adhesion, Blister test, Detachment, Elasticity, Fracture energy, Fracture mechanics, Non-linear elastic behavior, Pressure, Pull-off, Torsion.

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Document Details

Document Type
Technical Report
Publication Date
May 01, 1987
Accession Number
ADA179955

Entities

People

  • Alan Neville Gent

Organizations

  • University of Akron

Tags

Communities of Interest

  • Weapons Technologies

DTIC Thesaurus Topics

  • Adhesion
  • Adhesives
  • Air Force
  • Air Force Facilities
  • Biological Sciences
  • Engineering
  • Materials
  • Materials Science
  • Materials Testing
  • Measurement
  • Mechanics
  • Military Research
  • Physics
  • Physics Laboratories
  • Test Methods
  • United States
  • Weapons

Readers

  • Materials Science (Mechanical Engineering).
  • Structural Dynamics.
  • Surface Coatings Technology.