Friction and Wear Models of High Energy Ballistic Impact Wear Events Chet VanGaasbeek Rensselaer Polytechnic Institute Fall 2013 – Friction Wear and Lubrication of Materials Micrometeoroids and Orbital Debris (MMOD) • Large concern for space exploration. • Requirement to aggressively research material and composite combinations to protect spacecraft/satellite and astronauts. • Short term hypervelocity large particle impact vs long duration abrasive wear in space environment. • Typically experiment + model/FEA based research. Credit to NASA jsc.nasa.gov Modeling Approach • High fidelity material models necessary • Johnson-Cook Plasticity – Nonlinear plastic model based partly on transition and melt temperatures. • Johnson-Cook Damage and damage evolution – describes material evolution by damage parameter for high stress/strain/temp. • Mie-Gruneisen equation of state – Model pressure in a shockcompressed solid. • Smoothed Particle Hydrodynamics – Smeared material model at high strain to allow material to ‘flow’. Video!