The body of energy absorbing material may optionally be subjected to approximately hydrostatic pressure preferably exceeding {HEAD ~ the shear yield stress} of {TAIL ~ the energy absorbing material} 
The body of energy absorbing material may optionally be subjected to approximately hydrostatic pressure preferably exceeding { HEAD ~ the shear yield stress } of { TAIL ~ the energy absorbing material }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL