Abstract: In this paper,the problem of both the lateral and the logitudinal impactof bars is investigated.The feasibility of the dertermination of rigid / elastic impact loadsbetween structures with the method of mode superposition is verified。A numerical integra-tion method is developed to evaluate the time history of the impaact load , and the obtainedresults are analyzed and interpreted through the use of the theories of wave propagation,elastic contact and vibration modes。The accuracy and utility of the given me...