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).
