Slow strain rate tensile tests on notched specimens of copper

In this study, slow strain rate tensile tests have been performed on phosphorus alloyed copper under uniaxial and multiaxial stress states at 75 and 125 °C with two strain rates 10−6 and 10−7 s−1. Multiaxial stress states have been introduced by incorporating three different notch geometries on the uniaxial specimens. It has shown that the presence of the notches decreased the strength and ductility of copper. Ductility exhaustion was likely to be the dominant rupture mechanism. Finite element analysis was conducted to compare with the experimental results with a physically based model for stress strain flow curves without fitting parameters. The model could successfully describe the experimental data, and it could predict the dependence of acuity, temperature and strain rate in the multiaxial tests.