USAF (U. S. Air Force) Durability Design Handbook: Guidelines for the Analysis and Design of Durable Aircraft Structures
Abstract
Objectives of this handbook are to: 1) summarize and interpret the essential USAF durability design requirements for metallic airframes; 2) provide durability analysis criteria for economic life and durability-critical parts; 3) provide state-of-the-art durability analysis concepts and methods for determining the initial fatigue quality of fastener holes, the probability of distribution of service time to reach any specified crack size; 4) provide guidelines and design process and for making design tradeoffs. The method accounts for the initial fatigue quality variation, crack growth damage accumulation in a population of structural details (e.g., fastener holes, lugs, fillets, cutouts, etc.), load spectra and structural properties. During manufacturing and assembly, flaws of various types, are produced in structural details. The initial fatigue quality of such details is represented by an equivalent initial flaw size distribution (EIFSD). An equivalent initial flaw size (EIFS) is an artificial crack size which results in an actual crack size at an actual point in time when the initial flaw is grown forward. EIFSs are determined by back-extrapolating fractographic results.
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 20, 1989
- Accession Number
- ADA206286
Entities
People
- J. N. Yang
- S. D. Manning
Organizations
- General Dynamics