DYNAMIC PROPERTIES AND SPALL PLANE FORMATION OF BRASS

For a better understanding of crack forming processes including void n ucleation, growth and coalescence and the evolution of cracks, planar plate impact experiments in combination with VISAR- technique have bee n performed. Special attention was focused to impact conditions around the spall threshold. Three types of lead-containing brass samples wer e shock loaded to stress levels 0.85 GPa < sigma < 3.8 GPa. From the m easured velocity-time-histories Hugoniot data were obtained. Recovered samples have been examined by means of metallographic methods and sca nning electron microscopy. The dynamic material data serve as input da ta for LS-DYNA 2D-calculations employing a Gurson-based constitutive m odel.