Abstract: Impact phenomena of heavy hammer on cantilever beam are investigated. A motion equation for the hammer and a vibration control equation for the cantilever beam are both established therefore, and an impact force expression for the hammer acting on the cantilever beam is obtained by obeying the Galerkin principle. Obtained results point out that when mass of the hammer is grater than that of the cantilever, errors between the approximate solution of the impact force and experimental results, and those between the finite element approximation and the experimental results as well are obviously bigger without exception. When mass of the hammer is less than that of the cantilever, errors are less than 5% for above two cases.

Key words: laminated beam, heavy hammer, impact, dynamic load coefficient, finite element