Abstract
We investigated the influence of the direction and size of aluminum multiple circular pipes inserted in an aluminum rectangular tube on energy absorption characteristics by the finite element method and impact crushing test. The load of the model in which the circular pipes was vertically inserted was higher than that of the model in which the circular pipes was horizontally inserted, and the energy absorption amount increased. Subsequently, the models in which circular pipes with a large outer diameter and same thickness were inserted into the rectangular tube of aluminum were analyzed. From the analysis results, it was possible to improve the energy absorption characteristics per unit mass of the model in which circular pipes with a large outer diameter was vertically inserted. It was thought that the reduction of the load at the middle stage of crushing was suppresed because of generation of wrinkles and interference of some circular pipes. From this result, we created a model in which two circular pipes are arranged concentrically, and examined the influence on the energy absorption characteristics of interference with the circular pipes. For this model, we analyzed models for the various diameters of the inner circular pipes. From the analysis results, it was found that when the outer and inner circular pipes interfere each other, the load at the middle stage of crushing increased and the energy absorption increased.
