Abstract

Abstract A series of combined tension-torsion-internal pressure tests, each with a different amount of torsion present, are discussed. The specimens were tested in such a manner that the principal directions of the increments of natural plastic strain were kept constant. These increments can be summed in various ways, the simplest of which would yield finite strains with fixed principal directions. The octahedral shearing-stress versus octahedral shearing-strain diagrams for the four specimens tested coincide quite closely. The principal directions of stress were measured at each increment of strain and found to agree well with those of the increments of strain.

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