Accession Number:

AD0266556

Title:

FACTOR OF SAFETY CONSIDERATIONS FOR AERODYNAMICALLY HEATED STRUCTURES SUBJECTED TO HIGH CYCLIC STRESSES

Descriptive Note:

Final rept.

Corporate Author:

LOCKHEED MISSILES AND SPACE CO INC SUNNYVALE CA

Personal Author(s):

Report Date:

1961-10-01

Pagination or Media Count:

125.0

Abstract:

a parametric study was made from published lowcycle fatigue data showing the various effects on cycles-to-failure. Included are uniaxial and biaxial experimental results. True total strain range, ratio of minimum-to- maximum strain, and effects of geometry are the predominate parameters affecting fatigue life for mechanical cycling at room and elevated temperatures. Structural life was investigated in terms of the parameters for mechanical cyclic loading as well as for cyclic thermal straining. In the former case, expressions relating the parameters to structural life were found. However, in the latter case, no reliable expression between these parameters and structural life was found. A specific expression for conservatively predicting structural life or endurance is developed and applies to all materials, ratios of minimumto-maximum strains, temperatures, and states of stress. Also considered were single-cycle failures resulting from thermal shock.

Subject Categories:

  • Aircraft
  • Structural Engineering and Building Technology

Distribution Statement:

APPROVED FOR PUBLIC RELEASE