Figure 8. The normalized differences between the natural frequencies determined analytically and Figure 8. The normalized differences between the natural frequencies determined analytically and Figure 8. The normalized differences between the natural frequencies determined analytically and using FEM for the cantilever beam with a transverse closed crack that has the parameters x = 604 using FEM for the cantilever beam with a transverse closed crack that has the parameters x = 604 using FEM for the cantilever beam with a transverse closed crack that has the parameters x = 604 mm mm and a = 1 mm. mm and a = 1 mm. and a = 1