Simulation of crooked plate energy absorption structure under impact

Due to their simple structure, crooked plates are widely processed into energy absorption structures. There are obvious differences in the final deformation of crooked plates with different materials and dynamic conditions under the impact of constant-input kinetic energy. To better understand this phenomenon, we solved the Zhang-Yu equation with Maple software, obtained the law of generalized coordinates (rotation angle) of the energy absorber changing with time, and compared the energy absorption capacity of a crooked plate energy absorber under different parameters. To better understand how the motion of the energy absorber is affected by the change of parameters, we calculated the phase diagram of the energy absorber dynamics. After many numerical simulations, we found that the four-crooked plate energy absorber should have a mass-sensitive structure. We established the finite element model of dynamic buckling of mild steel and 6061-T6 aluminum alloy, and compared it with the Calladine-English dynamic experiment and Zhang-Yu rigid viscoplastic model. The results show that: (1) the Zhang-Yu rigid viscoplastic model has more guiding significance for mild steel (strain rate-sensitive material), and has greater error for 6061-T6 aluminum alloy (strain rate-insensitive material), and the prediction error further increases with the initial angle; and (2) by modifying the equivalent plastic length λ of a plastic hinge according to the finite element model, the prediction accuracy of the Zhang-Yu rigid viscoplastic model can be improved. Our research results certain guiding significance for the design and manufacture of energy-absorbing structures of crooked plates.