Abstract:3D numerical simulations of dynamical tensile response of hybrid carbon nanotube (CNT) and SiC nanoparticle reinforced AZ91D magnesium (Mg) based composites considering interface cohesion over a temperature range from 25 to 300 °C were carried out using a 3D representative volume element (RVE) approach. The simulation predictions were compared with the experimental results. It is clearly shown that the overall dynamic tensile properties of the nanocomposites at different temperatures are improved when the total volume fraction and volume fraction ratio of hybrid CNTs to SiC nanoparticles increase. The overall maximum hybrid effect is achieved when the hybrid volume fraction ratio of CNTs to SiC nanoparticles is in the range from 7:3 to 8:2 under the condition of total volume fraction of 1.0%. The composites present positive strain rate hardening and temperature softening effects under dynamic loading at high temperatures. The simulation results are in good agreement with the experimental data.

Key words: magnesium matrix composites; hybrid nanosized reinforcements; dynamic mechanical properties; numerical analysis