=+Problem 4.5 Let us consider the case of a bar in extension clamped at one end and submitted in a stepwise manner to an imposed displacement u0 at the other end.

EA????2u

????x2 − mü = 0 0 ≤ x ≤ 

u(x, 0) = 0 u̇ (x, 0) = 0 u(0, t) = 0 ∀ t u(, t) = u0 t > 0 This example is very similar to the case of a bar submitted to a tip load treated in Section 4.3.1,