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Results are presented of rapid-heating tests to deternine the tensile strength of lnconel and RS-120 titanium-alloy sheet heated to failure at uniform temperature rates from 0.2 F to 100 degrees F per second under constant load condltions. Yield and rupture stresses, obtained by rapid heating, are compared with yield and ultimate stresses from elevated-temperature tensile stress-strain tests for 1/2-hour exposure. The applicability of master curves and temperature-rate parameters to the prediction of yield and rupture stresses and temperatures under rapid-heating conditions was investigated.
Results are presented of some rapid-heating tests of some sheet materials - 7075-T6 and 2024-T3 (formerly 75S-T6 and 24S-T3, respectively) aluminum alloys, Inconel, and RS-120 titanium alloy - which are part of an investigation of a number of structural materials. The materials were tested at temperature rates from 0.2 degree F to 100 degrees F per second under constant-load conditions.
The linearized attenuation theory of NACA Technical Note 3375 is modified in the following manner: (a) an unsteady compressible local skin-friction coefficient is employed rather than the equivalent steady-flow incompressible coefficient; (b) a nonlinear approach is used to permit application of the theory to large attenuations; and (c) transition effects are considered. Curves are presented for predicting attenuation for shock pressure ratios up to 20 and a range of shock-tube Reynolds numbers. Comparison of theory and experimental data for shock wave strengths between 1.5 and 10 over a wide range of Reynolds numbers shows good agreement with the nonlinear theory evaluated for a transition Reynolds nuniber of 2.5 million.
The frequency characteristics and statistical properties of the buffet loads measured on the unswept wing and tail of a fighter airplane have been studied in the stall and in the shock regime. The results indicate that the wing loads in buffeting can be treated as the Gaussian response of a simple elastic system. The tail loads appear to represent a more complicated pattern.