Research on the in-plane impact resistance of sinusoidal arrow-shape honeycomb structure

To mitigate the structural damage caused by impact loading, this study proposes a novel negative Poisson's ratio honeycomb structure by integrating a sinusoidal curve configuration into an arrow-shaped honeycomb design, and investigates its dynamic impact performance. With other geometric and material parameters held constant, a series of sinusoidal-edged arrow-shaped honeycomb models are developed by varying the amplitude of the sine curve, the cell wall thickness, and the impact angle of the steel plate. The in-plane deformation behavior and energy absorption characteristics of these models under different impact velocities (10 m/s, 30 m/s, and 70 m/s) are systematically analyzed. Results indicate that increasing the thickness or reducing the amplitude effectively alleviates the necking phenomenon and promotes more uniform deformation. Moreover, larger amplitudes lead to longer stress lag zones at the fixed ends. Elevating the impact load, sine curve amplitude, or cell wall thickness results in higher platform stress. Under low-speed impact conditions, honeycomb structures with larger amplitudes exhibit superior specific energy absorption, whereas under high-speed conditions, those with smaller amplitudes demonstrate enhanced energy absorption efficiency. Furthermore, the concept of thickness gradient is introduced to investigate its influence on energy absorption performance. Findings reveal that the sinusoidal arrow-shaped honeycomb structure with a positive thickness gradient exhibits improved energy absorption capacity and superior impact resistance.