MODELS OF ULTIMATE STATE UNDER COMBINED LOADING WITH CYCLIC TENSION-COMPRESSION AND CYCLIC TORSION
DOI:
https://doi.org/10.20535/2305-9001.2013.68.36143Keywords:
solid cylindrical specimens, thin-walled tubular specimens, biaxial combined loading, cyclic tension-compression, cyclic torsion, fatigue failure, models of limiting state, classic fracture criteria.Abstract
The exact and approximate variations of ultimate state models of isotropic metallic materials under combined loading with cyclic tension – compression and cyclic torsion have been suggested. The relation between ultimate amplitudes of direct and shear stresses in exact models is given by the exponential transcendental functions. The approximate variations of the models have been obtained from the exact models by the expansion of the exponential transcendental functions in series and the containment of two or three series terms of the expansion. The models have been approved experimentally on problems of the ultimate state calculation of solid prismatic and thin-walled tubular specimens. The models of ultimate state proposed are compared with those constructed on the basis of classic fracture criteria.References
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