Impact of a pressurised membrane: Contact time

Pressurised membranes are used in various situations involving humans (protections, sports, etc). In this context, impacts mechanics of is critical since under or over inflated may create injuries. The effect inflation pressure on contact time investigated a model experiment using spherical membrane. Both gas and impact speed decrease time. Direct measurements temperature variations indicate an adiabatic compression strong interaction with the membrane described by three dimensionless numbers, (i) relative P˜, (ii) presso-elactic number PE that considers gas-membrane (iii) presso-inertial IP scales inertia to forces. A pressurised provided compared experiments. It shows depends mainly corrections P˜.