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Reliability of Adhesive Bonds Under Severe Environments (1984) / Chapter Skim
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'INTERESTS AND ACTIVITIES OF THE DEPARTMENT OF DEFENSE AND THE NATIONAL AERONAUTICS AND SPACE ADMINISTRATION'
Pages 9-12

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From page 9...
... A multidisciplinary approach is necessary to design, fabricate, and test the joint to attain the required reliability and durability necessary for joining of structural components. The sizes of interest within an adhesive joint vary over seven orders of magnitude, from atomic distances of 10~^ micrometers, through the interphase region, latex toughener particles, primer thickness, scrim fabric thickness, surface roughness, voids, and flaws to bondline thicknesses of 1CH micrometers.
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From page 10...
... Adhesive bonding will be a generally accepted method of joining structural members only after analytical models have been developed that can predict the long-term life of a joint following moisture intrusion, matrix aging, bond displacement, stress relaxation, and damage accumulation. The needs and interests of DOD and NASA involve the disciplines of mechanics, materials science, and chemistry to achieve the requisite long-term adhesive joints.
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From page 11...
... The various steels have different alloy compositions and heat treatments; if grit-blasting is to be avoided as a surface-preparative technique, special physical or chemical techniques have to be developed; the acid or base character of the steel surface will be highly variable; and a variety of conversion coatings are available. Thus each specific joint must be separately tailored for the specified materials and the environmental stresses to which it will be exposed.
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From page 12...
... Unfortunately, these various groups tend to be less stable than the aromatic backbone. Improvements in high-temperature adhesives may be possible by invoking some creative chemistry to look for new synthetic routes to intermediates, new toughening agents or systems, new coupling agents or systems, and new addition-type monomers that can produce thermally stable polymers.
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Key Terms

  • adhesive joints
  • adhesive bonding
  • adhesively bonded
  • material properties
  • joining structural

  • surface preparation
  • structural components
  • commercial aircraft
  • adhesive debonding
  • thixotropic adhesive

  • adhesive joining
  • utilize adhesive
  • minimize adhesive
  • toughener particles
  • thick sections

  • cryogenic temperature
  • failures attributed
  • design lives
  • nondestructive testing
  • temperature excursions

  • sections cool
  • aluminum components
  • nasa involve
  • certification processes
  • weaker hydroxides

  • coupling agents
  • glass transition
  • convert strong
  • primer thickness
  • nadimide terminated


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