THE INFLUENCE OF FLEET VARIABILITY ON CRACK GROWTH TRACKING PROCEDURES FOR TRANSPORT/BOMBER AIRCRAFT

The purpose of this program is to provide generalized crack growth tracking procedures for transport/bomber aircraft. The study was composed of three major tasks, (1) an evaluation of the effects of usage parameters on crack growth, (2) the development of generalized tracking procedures and (3) an evaluation of the techniques for implementing the individual aircraft tracking program. The KC-135A tanker was selected as the baseline aircraft for this study. Approximately thirty tests were conducted to experimentally verify predictions made from analyses and to determine the crack growth rate characteristics of the specimen material. The results of the parametric and variability studies were used to develop analysis schemes for predicting the effects of usage variations on crack growth. Four tracking procedures were evaluated: (1) pilot logs with the use of parametric crack growth rate data, (2) pilot logs with the use of parametric stress exceedance data, (3) the Mechanical Strain Recorder (MSR) and (4) the crack growth gauge. The implementation of each tracking procedure was evaluated by developing a cost model to study relative life cycle costs. (Author)

  • Corporate Authors:

    BOEING COMPANY

    SEATTLE, WA  United States 

    Air Force Flight Dynamics Laboratory

    Wright-Patterson Air Force Base
    Dayton, OH  United States  45433
  • Authors:
    • Bryan, D F
    • Lambert, G E
  • Publication Date: 1978-11

Media Info

  • Pagination: 208 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00197830
  • Record Type: Publication
  • Source Agency: National Technical Information Service
  • Report/Paper Numbers: AFFDL-TR-78-158 Final Rpt.
  • Contract Numbers: F33615-76-C-3130
  • Files: TRIS
  • Created Date: Sep 15 2003 12:00AM