A hinged-hinged beam of length **4** m, width **0.15** m and thickness **0.20** m with clamped edges is subjected to a suddenly applied load of **5000** N at the middle of the beam. The beam material has a Young's modulus of N/ and mass density of **100** kg/m. Two different models for the beam are tested: **18** two-noded degenerated shell elements model and four-noded isoparametric solid elements in which four elements are used across the thickness. The central deflection time history is plotted and compared to the analytical solution in Figure (2.13).