Research on energy absorption characteristics of biconical snap-fit spatial self-locking thin-walled structure

Abstract

Transportation, intelligent equipment and other fields have increasingly high requirements for the performance of energy absorbing structures, especially in the field of emergency protection. It is of great significance to study the self-locking characteristics and energy absorbing effect of new structures. Based on the excellent arc principle of women wearing hair hoops and the self-locking characteristics of mortise and tenon structure, this paper proposes a double arc clip type space self-locking thin-walled structure, which has the advantages of editable, easy to install quickly, and space all-round self-locking. The results of quasi-static compression test on a single thin-walled pipe are compared with those of finite element simulation. The overall error is controlled within 10%, and the results of the experiment and simulation are relatively consistent, which proves the feasibility of the follow-up study of the overall structure. The spatial self-locking ability and energy absorption characteristics of the structure under uniform impact load are verified by finite element method. The effects of geometric parameters and different impact velocities on the energy absorption characteristics of the structure are studied. The results show that: the double arc clip type space self-locking thin-walled structure can withstand the uniform impact load in all directions of the space, and the self-locking characteristics and energy absorption effect are the best when the impact direction is α=0 °, β=0 °; Without affecting the chord distance, the smaller the opening angle of the arc, the better the self-locking performance of the structure and the stronger the energy absorption effect.