Abstract
The stress-microstrain relationship is derived for metal crystals prestrained in easy glide from a modified form of the dislocation model proposed by Van Bueren [ IS]. The calculation is based on the elastic interaction of a constant density of moving dislocations which occur in groups on parallel glide planes. The unidirectional stress cycle damping loops can be described by the resulting relationships. The energy loss, the decrement and the frictional stress are calculated phenomenologically with respect to their depedence upon the stress amplitude. Microstrain measurements were made at room tempcrature and at 77 degrees K on a 99.999% pure Mg crystal. An analysis of the experimental data for Mg and other published data for Zn yields values for the mobile anelastic dislocation density and the internal stress affecting this dislocation motion.