Abstract
The stress behavior in laminated cantilever beams with adhesive layers under impact loadings are analyzed in an elastic region using three-dimensional finite element method (FEM). FEM code employed is DYNA3D. The stress wave propagation and the stress distribution at the adhesive interfaces are examined. In the experiments, the end of the beam is fixed and the other end of the one is subjected to an impact loading. An impact loading is applied to a beam by dropping a weight. The effects of Young’s modulus of the adherends, the adherend thickness, impact velocities, and the number of adhesive layers on stress statements at the interfaces are clarified. The following results are obtained. (1) The maximum principal stress (s1) in the adhesive layers are maximal at the adhesive interfaces. (2) It is found that the maximum principal stress (s1) at the interfaces increases as Young's modulus of the upper adherends increases. (3) The maximum principal stress(s1) at the interfaces decreases as the thickness of the adherend to which an impact loading is applied increases. (4) No difference in the tendency on the maximum principal stress (s1) distribution although the value of the one is proportional to the impact velocity. (5) The effect of the number of layers was found to be small on stress statement. (6) Experiments were carried out to measure the strain response of the adhesively laminated cantilever beams using strain gauges. A good agreement is seen between the tendencies of the analytical and experimental results.
