Abstract
A method of tabulating resolved shear stresses for any type of slip system has been devised. Diagrams of maximum resolved shear stress for torsion and tension as functions of orientation have been drawn both for the case of aluminium, with slip plane of type (111) and slip direction of type (110), and for the case of iron with slip direction of type (111) and any slip plane. Similar diagrams of harmonic mean stress in torsion also have been drawn. The effect of different criteria of failure in indicating the failure of polycrystalline specimens has been investigated. If elastic failure of polycrystalline specimens is determined entirely by the maximum resolved shear stress developed locally, the ratio of the yield in torsion to the yield in tension should be 0.500; whereas if elastic failure is determined by the complete yield of all the crystals of the specimen, the value of this ratio should be about 0.577.
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