Investigation and modeling of the anomalous yield point phenomenon in pure tantalum

The KEMC (Kubin-Estrin-McCormick) phenomenological model accounting for strain aging has been identified for several loadings and strain rates at room temperature. Simulations on full specimen using the KEMC model do not show strain localization, because of the competition between viscosity and strain localization. However, a slight misalignment of the sample can promote strain localization.