DYNAMIC BEHAVIOR OF HIGH-STRENGTH ARMOR STEELS

The dynamic properties of the armor steels Mars 190, Mars 240 and Mars 300 have been determined for strain rates 10(-3) s(-1) < d epsilon/dt < 10(6) s(-1). The planar plate impact technique in combination with a VISAR has been used for high strain rate testing (d epsilon/dt > 10( 4) s(-1)). The dynamic properties Hugoniot-elastic-limit, spall streng th, shock velocity-particle verlocity-relation and stress-strain-relat ion will be presented. Tests at intermediate strain rates 10(2) s(-1) < d epsilon/dt < n 10(3) have been performed using Taylor tests and a Split-Hopkinson-Pressure-Bar (SHPB) setup providing information about strain rate sensitivity, strain hardening and dynamic strength. In add ition to the determination of the dynamic properties, the influence of the loading process on the microstructure and the fracture mechanisms have been determined using optical and scanning electron microscopy ( SEM).