A Comparison of the Strengths of Metal-Metal and Metal-CFRP (Carbon Fibre Reinforced Plastics) Adhesive Bonded Joints at Various Test Temperatures.

Abstract

Tests on double lap joints bonded with a range of adhesives showed that differential thermal contraction of the adherends in metal-CFRP joints can greatly reduce strengths relative to metal-metal joints, particularly at low temperatures. However, the effect varied widely between adhesives, and relatively high strengths were obtained for an adhesive with a high strain to failure. Strengths of metal-CFRP joints were much higher when titanium was substituted for aluminum, as expected from the lower expansion coefficient of titanium. However, attempts to reduce thermal stress by lowering the stress-free temperature with the use of reduced cure temperatures were unsuccessful, possibly because the adhesives did not develop their full toughness. The low transverse tensile strength of CFRP also contributed in some cases to the reduced strength of metal-CFRP joints, relative to metal-metal joints.

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Document Details

Document Type
Technical Report
Publication Date
Oct 01, 1982
Accession Number
ADA130310

Entities

People

  • M. H. Stone

Organizations

  • Royal Aircraft Establishment

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Aluminum Alloys
  • Chemistry
  • Failure Mode And Effect Analysis
  • Fiber Reinforced Polymers
  • Material Degradation Processes
  • Materials
  • Materials Laboratories
  • Materials Processing
  • Materials Science
  • Materials Testing
  • Mechanical Properties
  • Modulus Of Elasticity
  • Plastics
  • Reinforced Plastics
  • Resins
  • Shear Stresses
  • Stress Strain Relations

Readers

  • Metallurgy
  • Reinforced Composite Materials
  • Surface Coatings Technology.