Crashworthiness analysis and multi-objective optimization of a novel metal/CFRP hybrid friction structures

This paper introduces a new hybrid friction energy-absorbing structures (HFEAS), which is consisting of a bearing bush, an anti-creeper device, a pretension bolt, a friction plate, and friction metal/CFRP tubes have been designed in the paper. The friction coefficient of raw material of CFRP was determined by the MM 3000 friction testing machine and a finite element model of HFEAS was established. Experimental verification of the finite element model was conducted, as well as a study of the influence of structural parameters on crashworthiness. By analyzing the parametric influence, the pre_force (P_F) has the largest influence on the HFEAS, followed by diameter (D) and stell_thickness (S_t), pre_length (P_L) and layer_number (L_n). In particular, the peak force increased by 8 times and the platform force was 15 times higher than origin, when P_F increases from 1 to 21 kN; Overall, the HFEAS combines the recycling and tribological characteristics of composite materials, offering a new direction for the iterative upgrading and development of energy-absorbing structures.