Effect of medium strain rates on mechanical properties of the high performance steels

![CDATA[In this study an investigation into the effect that medium strain rates have on the mechanical properties of cold drawn mild steel and 304 stainless steel has been carried out using 6 mm diameter cylindrical specimens. The tests were performed using an Instron test machine under a quasi-static strain rate, and a high capacity instrumented falling weight axial impact (IFWI) test rig. The axial load time histories were measured by a load cell connected to each specimen and the deformation time history by a strain gauge attached to each specimen. All the data was acquired by a high-speed data acquisition system at a sampling frequency of 300 kHz. The load histories showed high frequency oscillations and were digitally filtered by using a fourth order low pass Butterworth filter. The results showed that the yield stress and tensile strength of both types of steels increased with an increased rate of strain.]]