MULTIAXIAL CREEP STUDIES ON INCONEL AT 1500 F
The effect of multiaxial stresses on the creep rate and rupture life of inconel at 1500 deg F was investigated. A large range of principal-stress ratios in tension-tension and tension-compression states was studied using axially loaded pressurized tubes. The creep-rate results were compared with both the von Mises (distortion energy) and the Tresca (maximum-shear-stress) criteria. Correlation of the creep-rate results was slightly better using the von Mises criterion; however, the simpler and more conservative Tresca criterion appears to be quite adequate for design considerations The results of the rupture tests appear to support the maximum principal-stress criterion for time-dependent fracture under multiaxial stress conditions. It was shown, however, that in applying this criterion it is important to compensate for the reduction in rupture life caused by changes in the stress state associated with deformation. Rupture strains were found to be directly related to the deviatoric stresses for constant maximum principal stress. The shear strain at rupture was found to be constant for the same maximum principal stress in tension-tension stress states, thus showing that under these conditions the total ductility of the metal was not impaired by increasing the hydrostatic stress. In tension-compression states, the material sustains greater shear strain before rupture. (auth)
- Research Organization:
- Oak Ridge National Lab., Tenn.
- NSA Number:
- NSA-14-004562
- OSTI ID:
- 4221382
- Journal Information:
- Journal of Basic Engineering (U.S.) Divided into J. Eng. Mater. Technol. and J. Fluids Eng., Vol. Vol: 81; Other Information: Orig. Receipt Date: 31-DEC-60
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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