Update on the Development of a Multiscale Friction Model

Two sets of experiments designed to produce dry sliding of metal-on-metal resulting in normal pressures up to tens of GPa and sliding velocities up to hundreds of meters per second are simulated numerically for the purpose of evaluating a new multiscale friction model. These experiments involve the impact of a cylindrical copper flyer onto a composite cylindrical target composed of an aluminum inner core and a stainless steel circumferential confinement. The primary diagnostic in
these experiments is a measurement of free-surface velocity. Numerical simulations are conducted using the Los Alamos finite volume continuum mechanics code FLAG. The primary metric of evaluation is a comparison of predicted free-surface velocities to those measured. The importance of accounting for friction in the simulation of these experiments is clearly demonstrated. It is shown that the FLAG implementation of the new multiscale friction model provides capabilities that are essential in the modeling of dry sliding friction.