MATERIALS TESTING FOR CONSTITUTIVE RELATIONS

High strain rate tests have been carried out at both room temperature and 100 degrees C on a Ti6A14V alloy using the torsional split Hopkins on pressure bar. An infrared radiometer has been developed to measure the surface temperature of the specimen during the high speed torsiona l test. Data have been obtained on the variation of stress with strain and strain rate at shear strain rates from 0.0007s(-1) to 1000s(-1) a nd on the adiabatic temperature rise during deformation at the higher rates. This data has then been used to determine suitable values for t he material constants in a constitutive relation of the form proposed by Zerilli-Armstrong for bce materials for application to the hcp tita nium alloy used in the present investigation.