Enhancing resistance of honeycomb sandwich panel under local impact through face sheet-core matching relationship

Abstract

To enhance the resistance of honeycomb sandwich panel against local impact, this study delved into the matching relationship between face sheets and core. An integrated approach, combining experiment, simulation, and theoretical methods, was used. Local loading experiments were conducted to validate the accuracy of the finite element model. Furthermore, a control equation was formulated to correlate structural parameters with response modes, and a matching coefficient λ (representing the ratio of core thickness to face sheet thickness) was introduced to establish a link between these parameters and impact characteristics. A demand-driven reverse design methodology for structural parameters was developed, with numerical simulations employed to assess its effectiveness. The results indicate that the proposed theory can accurately predict response modes and key indicators. An increase in the λ bolsters the structural indentation resistance while concurrently heightens the likelihood of penetration. Conversely, a decrease in the λ improves the resistance to penetration, albeit potentially leading to significant deformations in the rear face sheet. Numerical simulations demonstrate that the reverse design methodology significantly enhances the structural penetration resistance. Comparative analyses indicate that appropriate matching reduces indentation depth by 27.4% and indentation radius by 41.8% of the proposed structure.

Keywords

sandwich panel / local impact resistance / matching relationship / resistance enhancement

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