Sunil C Joshi
Nanyang Technological University
Singapore
Title: Characteristics of hypervelocity impact of Micro-particles on multi-foils shield configurations
Biography
Biography: Sunil C Joshi
Abstract
Numerical investigation is carried out to assess performance of multiple foils shield configurations against hypervelocity micro-particle impact. Micro particle material mainly consists of three materials, namely aluminum, float glass and steel. Further the shield configuration is modelled by aluminum in first bumper foil and Ti-6Al-4V in the second foil. The modeled impact scenario has consistent dimensions in every simulation with the micro-particle diameter, first foil thickness and second foil thickness measuring 47μm, 8μm, 15μm respectively. Numerical investigation of the shield configuration was performed using smooth particle hydrodynamic processor in AUTODYN hydrocodes and material modeling was accomplished using an equation of state with constitutive strength and cumulative damage model. The numerical results accurately depict the DC generation, kinematic and geometrical parameters of the DC, micro-particle condition, and standoff foil condition after the impact. Studies have shown that a two foil shield configuration is capable of restraining micro-particles with mechanical strength similar to float glass and aluminum. Additionally a 1-mm thick Ti-6Al-4V plate has to be added into the shield configuration at 5 mm distance from the second foil to resist the impact of rigid (steel) micro-particles.
