Abstract
This paper is concerned with certain new structural problems which result from flight of aircraft under variable stress and elevated temperature conditions arising from aerodynamic heating. Since creep is a governing factor in determining life expectancy under elevated temperatures, a review was made of test data under cyclic stress conditions at elevated temperatures. These data indicate that gust loadings under elevated temperature conditions may not materially affect the life expectancy of the aircraft. Furthermore, the total creep under cyclic loading conditions appears to result from the net time spent at a particular stress level. Based on these data, a cumulative creep hypothesis is suggested for use in analysis of life expectancy under variable stress and temperature conditions.
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