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Accelerated Aging of Materials and Structures The Effects of Long-Term Elevated-Temperature Exposure (1996) / Chapter Skim
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2 AIRCRAFT OPERATING ENVIRONMENT
Pages 7-10

The Chapter Skim interface presents what we've algorithmically identified as the most significant single chunk of text within every page in the chapter.
Select key terms on the right to highlight them within pages of the chapter.


From page 7...
... flight profile involving sustained cruising speed above Mach 2.0, was described by Harpur (1968~. Like subsonic aircraft, the Concorde experiences variations in stress and tem perature during flight; however, the airframe temperature va~i ations are much more significant than for subsonic aircraft due to the effect of aerodynamic heating at supersonic speeds.
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From page 8...
... Chemicals encountered in aircraft servicing, including cleaning fluids, fuel, de-icing and anti-icing fluids, paint strippers, and hydraulic oils, need to be identified and the effect on finishes and components assessed. Another consideration is the integrity of repairs that are made to structural components during airline service.
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From page 9...
... To fully characterize thermal exposures, thermal and optical properties of the candidate structural materials and surface finishes as well as heat-transfer behavior characteristics must be understood. In addition to mechanical load conditions encountered in flight, designers must also account for thermal expansion 9 effects and thermal expansion mismatches between adjacent structures.
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From page 10...
... Emphasis should be placed on the analysis of aerothermal and chemical interactions and heat transfer to better define component temperature and thermal gradients and on characterization of ambient exposure conditions throughout the typical flight regimes. The range of thermal, mechanical, and environmental conditions described in this chapter and the complex interactions among them makes the HSCT an instructive case study in the examination of materials aging responses.
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Key Terms

  • aerodynamic heating
  • flight cycle
  • current commercial
  • subsonic aircraft
  • commercial aircraft

  • structural materials
  • ambient environmental
  • speed increases
  • typical service
  • supersonic cruise

  • operating temperatures
  • skin temperature
  • severe service
  • duty cycle
  • thermal expansion

  • fluid exposures
  • ground handling
  • cruise conditions
  • altitude increases
  • exposure conditions

  • conditions described
  • external surface
  • flight exposure
  • model expected
  • oxygen concentration

  • cycle represents
  • cruising speed
  • requiring repair
  • expected temperatures
  • surface emissivity


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