Dynamic Characterization of Shape Memory Titanium Alloys

Abstract

Evaluation of high strain rate behavior of materials at pre‐fracture strains is very important where the materials are considered for ballistic applications. High compression strain rate response of shape memory titanium alloy including a typical titanium alloy are determined using the split Hopkinson pressure bar (SHPB). The conventional SHPB technique has been routinely used for measuring high strain rate properties of high strength materials. A split Hopkinson bar consisting of 10‐mm diameter Maraging 350 alloy incident, transmitter, and striker bars was used to determine the compressive response of these alloys. Attempts are underway to use this technique to extract useful information required to design a material for improving its impact resistance. Initial test results performed on these different titanium alloys show an interesting trend with change of composition. Attempts were made to compare the stress‐strain data of these alloys with the published data for titanium alloys. Stress‐strain data and changes resulting in the microstructure from strain rates in the regime 1800–4000/s are presented.