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[SEAOC] Impact Loads

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I am working on designing a series of columns that are designed to
support glass walls that will contain marine mammals.  The
specifications give the masses and velocities of the various animals,
but not the methods of calculating the impact forces of these animals
against the wall.  It was recently decided by the group of interested
parties that using the kinetic energy of the animal and allowing it to
deform a certain distance upon impact would be used to calculate the
force.  Unfortunately, by using a energy method, the kinetic energy of a
bird at 50 mph is the same as a sea lion at 5 mph, so the walls could be
designed identically.  Is there a better method to be used?  One based
on momentum or previous animal studies.  This is similar to what
aeonautical engineers do when designing aircraft to survive bird impacts
on windshield or engine fan blades.  Any help would be appreciated.