Determination of the constants of Zerilli-Armstrong model using inverse Taylor test

Tayolr test is a popular experimental technique which is widely used to study the response of materials at high strain rates and elevated temperatures. The technique, however, suffers from serious shortcomings such as in situ heating the specimens for testing materials at elevated temperatures. We introduce the inverse Taylor test in which the difficulties which are normally associated with the conventional Taylor test are eliminated. The new technique is used to identify the constants of Zerilli-Armstrong material model for a copper alloy in this work. In this technique, the target (specimen) and the projectile (striker) swap their positions as usually considered in the conventional Taylor test. The experiments are conducted at ambient and elevated temperatures under high impact velocities. The constants of the model correspond to the case when the difference between the experimental and numerical mushroomed profiles of the specimen after impact is optimized. The accuracy of the constants is verified by quasi-static test. The results indicate that Z-A model can successfully predict the copper alloy deformation in the inverse Taylor test.

Keywords:

Inverse Taylor test , zerilli-Armstrong model , LS-DYNa simulation , Optimization