Accession Number : ADP003190

Title :   Development of Lightweight Commercial Aircraft Windshields with New High Strength Glasses,

Corporate Author : PPG INDUSTRIES INC PITTSBURGH PA GLASS RESEARCH CENTER

Personal Author(s) : Gourley,W. E. ; Littell,H. E. , Jr

Report Date : DEC 1983

Pagination or Media Count : 24

Abstract : To evaluate the effect of increased surface compression on failure resistance, it was necessary to test instrumented windshields and measure surface stress versus velocity for different designs. A resulting test program included 164 bird impacts against 28 full-size, flat windshields incorporating different interlayers and glass plies of varying thicknesses at varying locations and temperature conditions. This paper presents the results of the program in the form of stress-velocity curves and pass-fail results for different designs. It also shows the evolution of a design which features a thick high strength thermally tempered core for load carrying and a thin chemically strengthened inboard ply to enhance fail-safe yet survive the stresses which occur during impact. The thick/thin high strength glass windshield met all bird impact qualification tests at Boeing and subsequent thermal-pressure certification. This design concept was also employed for lighter weight retrofit applications for other commercial aircraft windshields.

Descriptors :   Windshields, *Glass, *Laminated glass, Aircraft equipment, High strength, Lightweight, Commercial aircraft, Test methods, Bird strikes, Impact, Resistance, Symposia

Distribution Statement : APPROVED FOR PUBLIC RELEASE