Analysis of Dynamic Mechanical Behavior in Reverse Taylor Anvil-on-rod Impact Tests

A one-dimensional analytical model has been developed for the reverse Taylor anvil-on-rod impact experiment to provide a method of extracting quantitative information from transient deformation states obtained from high-speed camera data. An indication of the plastic wave velocity and dynamic flow stress at varying locations and time are presented for two Cu OFE specimens impacted at 83 ± 1 and 205 ± 3 m/s. The results provide supporting evidence of previously reported “non-linear” and “quasi-steady” plastic wave propagation response, as well as a region of perfectly plastic behavior, which is independent of strain-rate in the higher impact velocity experiment. Additionally, the results show good agreement with the average value of dynamic yield stress calculated using Wilkins’ analysis, based on a perfectly plastic material response. Furthermore, this work demonstrates the importance of careful design of Taylor impact experiments for ∗ Corresponding author. Tel.: +1-404-894-2651. E-mail address: [email protected] (N.N. Thadhani).