Pressure Cycling Fatigue Tests of F-111 Crew Module Glass Transparencies
Abstract
The F-111 Crew Module Transparencies Fatigue Test Program was initiated to resolve questions on the effects of complete pressure reversals combined with thermal cycling on the fatigue life of the transparencies. A ship- set of transparencies were mounted in a crew escape module and subjected to a simulated flight heating, cooling and pressure environment. The test specimens successfully completed four lifetimes of testing and had residual static strength in excess of the design ultimate load of the escape module. An ambient temperature fatigue test was added to the program to investigate the propagation characteristics of debonded areas in the transparency edge members which were occurring in service. A ship-set of transparencies with debonded areas large enough to require replacement under applicable technical orders were mounted in an escape module and subjected to simulated subsonic flight usage. The test specimens successfully completed four life times of testing with no failures of the glass and only very small growth of some of the debonded areas.
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 01, 1977
- Accession Number
- ADA049625
Entities
People
- George R. Holderby
Organizations
- Flight Dynamics Laboratory