Shear Viscosity Effect on High-Speed Deformation of Copper

The paper presents many study cases on the effect of shear viscosity on the deformation and jet formation posterior to the impact of copper powder onto copper substrates. Thanks to a physics-based plasticity model dedicated to high strain rates processes, we performed a batch of numerical finite element simulations in order to understand the way copper particle flatten and expulse material outside the zone of contact. We considered a continuous function of viscosity as a first shot followed by other cases where temperature thresholds are considered to enable the action of shear viscosity. In the present paper we are not aiming to compare numerical results to experimental data rather than depicting the influence and the importance of physical parameters such as shear viscosity on the development of jetting in impacted copper.