Accession Number : ADA140714

Title :   Durability of Structural Adhesively Bonded Systems,

Corporate Author : TECHNION RESEARCH AND DEVELOPMENT FOUNDATION LTD HAIFA (ISRAEL)

Personal Author(s) : Ishai,O. ; Yaniv,G. ; Altus,E.

Report Date : NOV 1983

Pagination or Media Count : 126

Abstract : The present report deals with the mechanical behavior of the bonded system after curing and in service when exposed to different hygrothermal conditions. An analysis was developed which enable the prediction of adhesive residual thermal stresses after curing, their time-dependence on temperature and moisture conditions, and the resulting deformational behaviour of the bonded system. The non-linear viscoelastic behaviour of the adhesive under such circumstances was tackled by using advanced finite-element approach. The deformational behaviour of a non-symetrical bonded specimens were exmained through experimental investigation. Analytical results indicate a significant Hygrothermal effects on stress relaxation in the adhesive at the viscoplastic range. A mathematical tool was developed to deal with the effect of stresses on interlaminer crack propagation. This will, provide the first step toward the prediction of failure initiation and propagation within the bonded phases, which is the objective of the next stage of the present project.

Descriptors :   *Adhesive bonding, *Bonded joints, *Endurance(General), *Structural analysis, *Mathematical analysis, Adhesives, Mechanical properties, Stress analysis, Thermoelasticity, Crack propagation, Stress relaxation, Viscoelasticity, Adhesion, Moisture, Humidity, Life expectancy(Service life), Composite materials, Reinforced plastics, Carbon fibers, Laminates, Aluminum, Time dependence, Temperature, Finite element analysis, Mathematical models

Subject Categories : Adhesives, Seals and Binders
      Refractory Fibers
      Laminates and Composite Materials
      Fabrication Metallurgy
      Plastics

Distribution Statement : APPROVED FOR PUBLIC RELEASE