Experimental Investigation of Plastic Deformation of Ti-6Al-4V under Various Loading Conditions

Plastic deformation of 0.25” thick Ti-6Al-4V plate is investigated. Compression, tension and shear tests are carried out from quasi-static strain rates (10^-4 s^-1, 10^-2 s^-1) to high strain rates (up to 5x10³ s^-1) to study the strain rate sensitivity of the material. Tension and compression tests are carried out on specimens machined in different directions of the plate (at 0°, ±45°, 90° to the rolling direction of the plate in tension and at 0°, ±45°, 90° to the rolling direction and through the thickness of the plate for compression tests) to study the anisotropy effects. High temperature compression tests are carried out at 200° C, 400° C and 600° C to study the temperature effects on the plate. The setups required to perform all these tests and the theories behind the high strain rate tests are explained.

The results show the strain rate sensitivity, anisotropy and the temperature effects on the Ti-6Al-4V plate. Johnson – Cook material constants are found out from the experimental data and simulations are run to fit the Johnson Cook model to simulate various tests.