Patent ID: 8820493

Claim:
A crash energy absorber comprising: a solid polymer plastic ultrahigh molecular weight damping material body having an external seat surface and having a critical stress magnitude which varies as crash velocity increases and an ultrahigh molecular weight; a vessel configured to confine the solid polymer plastic ultrahigh molecular weight damping material body; a plunger shaft having a distal end disposed at the seat surface of the solid polymer plastic ultrahigh molecular weight damping material body; and the plunger shaft having a cross sectional area and length relative to the vessel and the solid polymer plastic ultrahigh molecular weight damping material body so configured for the plunger to press on the solid polymer plastic ultrahigh molecular weight damping material body seat surface in response to impact energy until said critical stress magnitude of the solid polymer plastic ultrahigh molecular weight damping material body is reached based on the plunger cross sectional area and velocity causing a phase change in the solid polymer plastic ultrahigh molecular weight damping material body to a liquid state ahead of and adjacent the plunger shaft displacing the plunger shaft into the solid polymer plastic ultrahigh molecular weight damping material body until a stroke of the plunger shaft travel is reached or said impact energy is absorbed causing the solid polymer plastic ultrahigh molecular weight damping material body to undergo a phase change back to a solid adjacent the plunger shaft locking said plunger shaft within the solid polymer plastic ultrahigh molecular weight damping material body.