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The code (described in detail in Ref. 1) simulates the localization and break-up process of shaped-charge jets and expanding-rings, following macroscopic shear bands formation. The elongating specimen is described as consisting of different size mass-blocks separated by sliding shear-bands with varying yield stress (see Fig. 1a,b.) and the simulation is based on solving the equations of motion for the whole system. The main results of the simulation runs are presented. They indicate that although the yield stress value inside shear bands' is very widely spread its average value remains unchanged till break-up. The predicted number of fragments as a function of the strain rate for expanding copper rings is found to be in excellent agreement with the experimental measurements when the Johnson-Cook parameters are used

Results from a one dimensional code for simulating the ductile break-up process of shaped charge jets and expanding rings