DARWIN® Roadmap for Cold Dwell Fatigue

Details

• Creators:
  Sobotka, James C ; Enright, Michael P ; McClung, R. Craig
• Corporate Creators:
  Southwest Research Institute
• Corporate Contributors:
  United States. Department of Transportation. Federal Aviation Administration. Policy & Standards Division ; Air Force Research Laboratory (Wright-Patterson Air Force Base, Ohio)
• Subject/TRT Terms:
  • Fatigue (Mechanics)
  • Tolerances (Engineering)
  • Time dependence
  • Crack propagation
  • Titanium
  • Cold dwell fatigue
  • Damage tolerance
  • DARWIN
  • Microtextured region
  • Fatigue crack growth
  More +
• Publication/ Report Number:
  DOT/FAA/TC-24/15
• DOI:
  https://doi.org/10.21949/1528275
• Resource Type:
  Tech Report
• Geographical Coverage:
  United States
• Edition:
  Final Report, January 2022-August 2022
• Contracting Officer:
  Galella, David; Golden, Patrick
• Corporate Publisher:
  United States. Department of Transportation. Federal Aviation Administration. William J. Hughes Technical Center
• Abstract:
  Cold dwell fatigue (CDF) is a time-dependent process in near-alpha titanium alloys at temperatures below 300°C that involves metal degradation in the presence of creep to produce cracking on low-energy fracture facets in preferentially oriented, hard-alpha grains. It can cause significant reductions in fatigue life, and experience has shown that it can potentially result in catastrophic rotor failure. Well established methods have not been developed to incorporate this failure mode into assessments of component life and fracture risk management.
• Format:
  PDF
• Funding:
  FA8650-23-C-5203
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/77135/dot_77135_DS1.pdf
• File Type:
  [PDF - 951.07 KB]
• Collection(s):
  FAA William J. Hughes Technical Center for Advanced Aerospace
• Main Document Checksum:
  urn:sha-512:0805919797e929f903b06323c5fac3f27d45aa9301c9f815d78189706f388da6d627ffaea7b700411ffb2afac41a93989fccec2a6dd4e7fbe38508da7028d56c