An Experimental Evaluation of the Mechanical Response Characteristics of Rene 95.
Interim rept. Sep 78-Apr 80,
CINCINNATI UNIV OH DEPT OF AEROSPACE ENGINEERING AND APPLIED MECHANICS
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The mechanical responses of thermomechanically processed cast and wrought Rene 95 at 650C 1200 F was studied. The experimental program included tensile and compressive tests at different constant strain rates, creep in tension at and compression at twelve stress levels, strain recovery, stress relaxation, creep response to a sequence of step stress histories and fatigue under load control. The results are important for the understanding of the material response characteristics and for the development of a realistic constitutive model. Most of the tests were done in tension and data was used to evaluate various constitutive assumptions. It was shown that the engineering stress-strain response is relatively insensitive to changes in strain rate at rates above 5min. It was also shown that the compressive stress-strain response is about 10 stiffer than the tensile response and the minimum creep rate in compression. The hysteresis loop developed a mean tensile strain. It was found that the logarithm of the minimum creep rate is linear in the true stress and that creep and stress relaxation can be correlated using isochronous creep curves. The minimum creep rate is also independent of step changes in the stress history. Author
- Metallurgy and Metallography