MESOSCALE STUDY ON THE DYNAMIC MECHANICAL BEHAVIORS OF Al-PTFE-W REACTIVE MATERIALS

Mesoscale simulations were conducted to investigate the dynamic mechanical behavior of Al-PTFE-W reactive materials. Based on stress-strain curves and microstructural evolution of the materials, the dynamic response mechanism of the materials was revealed, and the effects of W content and temperature on the dynamic mechanical properties of the materials were analyzed. The results demonstrate that the failure of the materials is a process of damage accumulation, in which microvoids generate and develop to form cracks. Two forms, dislocation between metal particles in contact as well as matrix fracture due to extrusion or shearing of metal particles on either side, induce the microvoids. Addition of W with high strength improves the compressive resistance of the materials, but excessive W particles destroy the continuity of matrix, which is easy to cause premature failure of the materials. The thermal effect simultaneously reduces the strength of metal particles and matrix, thus reducing the compressive resistance of the materials and promoting the matrix cracking.