Accession Number:

ADA167596

Title:

Durability under Repeated Buckling of Stiffened Shear Panels,

Descriptive Note:

Corporate Author:

TECHNION - ISRAEL INST OF TECH HAIFA DEPT OF AERONAUTICAL ENGINEERING

Personal Author(s):

Report Date:

1983-03-01

Pagination or Media Count:

50.0

Abstract:

An experimental investigation was carried out on the durability of thin webbed beams subjected to repeated shear bucklings. Although the repeated loading exceeded the initial buckling load several times, it was in the range of 25 to 50 of the ultimate loads, which is well within the flight envelope of many airframes. Initiation and propagation of fatigue cracks up to complete failure was followed during the tests. An empirical life prediction formula based on this test series was developed and will be updated by further testing. The experimental investigation was supplemented by numerical analysis using the STAGS computer program. The number of load cycles to crack initiation, N sub i, and the fatigue failure N sub f, ranged in this test series from about 20,000 cycles to about 200,000 cycles. It appears that the most significant parameter affecting N sub f was the ratio of ultimate to cycling loads. Keywords Israel Aeronautical engineering. Author

Subject Categories:

  • Aircraft
  • Structural Engineering and Building Technology
  • Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE