AN EXPERIMENTAL INVESTIGATION OF TENSILE DEFORMATION OF ROUND BARS

Round specimens of different sizes and made of aluminium and copper were subjected to uniaxial tension; and on the basis of data thus obtained, a semi-empirical approach was developed to analyze tensile deformation and the effects of specimen size there on both before and after the onset of nonuniform deformation. Results reveal that, while a diffused instability sets in as the load approaches its maximum, the initiation of localized neck is delayed well beyond this point. This delay, however, is found to depend on the length as well as the diameter of the specimen.