Accession Number:

ADA064742

Title:

States of Stress and Strain in Adhesive Joints.

Descriptive Note:

Interim rept. 30 Sep 77-28 Sep 78,

Corporate Author:

BRISTOL UNIV (ENGLAND) H H WILLS PHYSICS LAB

Personal Author(s):

Report Date:

1978-09-29

Pagination or Media Count:

45.0

Abstract:

The swelling during water uptake by adhesive joints is strongly inhomogeneous. In particular, there exists a well defined shoulder between fully saturated and less than fully saturated adhesive. The principal stresses, introduced as a consequence of the mechanical constraint exerted by the adherends, include a normal stress that is compressive near the rim of the adhesive layer and tensile near its center. The magnitude of this stress has been measured, for joints involving aluminum as one adherend and a microscope cover slip as the other adherend by analyzing the pattern of Newtons rings created between the cover slip and on optical flat.

Subject Categories:

  • Fabrication Metallurgy
  • Plastics
  • Couplers, Fasteners and Joints
  • Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE