Effects of Impact Velocity and Stress Concentrators in Titanium on Failure by Adiabatic Shearing

摘要

This Interim Report covers the contract period from Feb. 18/2000 to June 17/2001 (third period of three months). During that period a series of tests on the Modified Double Shear specimens (MDS) of different notch geometry loaded by direct impact has been completed. The material tested was Ti-6A1-4V, delivered by the ARL-APG-AMSRL. This series of tests was performed to complete testing at high strain rates with different stress concentrators and to compare results with the standard MDS geometry. Analysis of oscillograms obtained with those tests are almost finished. Before testing the experimental setup for the direct impact loading has been improved. The experimental results show a substantial rate effects for all notch geometry. The failure criteria and the energy to failure are the tasks to be studied in the near future.