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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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EXECUTIVE SUMMARY
Pages 1-4

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 1...
... The steps required to characterize the aging responses of materials and the evaluation of structures include: · defining the service environment, · identifying probable degradation or failure mechanisms, characterizing the materials aging responses using accelerated methods and analytical models, · using test and model results to analyze and understand aging in structural components, and · validating predictions. As a general finding, the committee determined that several organizations have important roles in the characterization of materials aging in high-speed aircraft applications.
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From page 2...
... · The committee recommends that NASA emphasize fundamental work to characterize materials properties and, most important, to determine critical degradation and damage accumulation mechanisms over a broad range of environmental conditions. This work should allow determination of the mechanisms that are likely to have the greatest influence on component durability.
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From page 3...
... The committee recommends development of: · Accelerated exposure and test methods, with calibration to service conditions or end-of-life microstructural conditions, for critical degradation mechanisms. Testing and exposure approaches that allow incremental application of conditions to evaluate multiple, synergistic degradation mechanisms.
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From page 4...
... Chapter 3 identifies and describes the candidate structural materials for such aircraft applications. Chapter 4 describes critical degradation mechanisms for the various candidate materials.
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Key Terms

  • aging responses
  • materials properties
  • damage accumulation
  • service conditions
  • materials aging

  • structural materials
  • critical degradation
  • accelerated methods
  • candidate structural
  • using accelerated

  • accelerated aging
  • accelerated testing
  • accelerated exposure
  • damage mechanisms
  • fundamental materials

  • synergistic effects
  • performance metrics
  • failure modes
  • fundamental relationships
  • aging characterization

  • material responses
  • property metrics
  • analytical models
  • aircraft structures
  • analytical techniques

  • property test
  • modeling capability
  • exposure conditions
  • accelerated exposures
  • component performance


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