0

Full Content is available to subscribers

Subscribe/Learn More  >

F-22 MECSIP Lessons Learned: Risk Based Fatigue Scatter Factors High Durability Margin Analysis Using Miner’s Rule and Weibull Analysis

[+] Author Affiliations
Stefan M. Glista, Weibe Postema

Lockheed Martin, Marietta, GA

Lily Arcusa

F-22 System Program Office, Wright-Patterson AFB, OH

Brad Clark

F-22 System Support Office, Hill AFB, UT

Paper No. IMECE2011-63753, pp. 593-610; 18 pages
doi:10.1115/IMECE2011-63753
From:
  • ASME 2011 International Mechanical Engineering Congress and Exposition
  • Volume 9: Transportation Systems; Safety Engineering, Risk Analysis and Reliability Methods; Applied Stochastic Optimization, Uncertainty and Probability
  • Denver, Colorado, USA, November 11–17, 2011
  • Conference Sponsors: ASME
  • ISBN: 978-0-7918-5495-2
  • Copyright © 2011 by ASME

abstract

A top-level safety requirement for aircraft is that the probability of structural failure, resulting in the loss of aircraft, shall be less than 1 × 10−7 per flight hour. A reasonable approach to justify fatigue scatter factors is to derive them from this top-level safety requirement. The minimum scatter factor that can be justified using Weibull analysis is a function of the material data and stress level. Typical results at realistic stress levels range from 8 to 16 lifetime analytical margin to the characteristic life of the S-N data set. Weibull analysis results demonstrate that a 4-life time test provides high probability of detecting a design margin shortfall. Scatter Factors are also derived for design loads and life tracking loads. The analysis discussion addresses single-point-failure safety critical structure; however, a Weibull based probability analysis for multiple-load-path structure with dependent failure mechanisms is also included. Graphical and statistical proofs justify the material scatter factors. The F-22 program uses Weibull based probability analysis for design margins, testing, certification and life management. We call the risk based scatter factor approach High Durability Margin Analysis (HDMA).

Copyright © 2011 by ASME

Figures

Tables

Interactive Graphics

Video

Country-Specific Mortality and Growth Failure in Infancy and Yound Children and Association With Material Stature

Use interactive graphics and maps to view and sort country-specific infant and early dhildhood mortality and growth failure data and their association with maternal

NOTE:
Citing articles are presented as examples only. In non-demo SCM6 implementation, integration with CrossRef’s "Cited By" API will populate this tab (http://www.crossref.org/citedby.html).

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In