
439Shock Physics
If we were to shock a material with a certain pulse length, λ
1
, over a particular time, t
1
, the
shock would have moved a distance
(16.89)
The instant the applied load has ceased, a relief wave would begin moving into the
material and at a time t > t
1
would be located at a distance from the point of shock ini-
tiation of
R
(16.90)
Since we saw from our examination of Equations 16.87 and 16.88 that U
R
> U, we can deter-
mine the distance at which the relief wave will catch up to the shock wave through
R
1
(16.91)
If we insert Equations 16.87 and 16.88 into this expression, we obtain
00 1