An analytical study on low velocity impact resistance behaviors of general bio-inspired helicoidal composite plates

Through evolutionary processes, helicoidal structures have been proven to exhibit exceptional load-carrying capacity and impact resistance performance. To date, extensive experimental and numerical studies have been carried out on their impact behaviors, while few relevant analytical studies have been reported even though it is urgently needed for the preliminary assessment of structure design and optimization. In this work, based on the first shear deformation theory (FSDT) and the improved linearized Hertzian contact method, an analytical model for low velocity impact (LVI) performances of helicoidal laminates with arbitrary layups is developed. Therein, the post-impact damage is taken into account according to continuum damage mechanics (CDM). Comparisons of load-carrying capacity and energy-absorbed performance between the proposed model prediction and the existing experimental data\numerical results have been made for verification. Besides, LVI behaviors of conventional laminates with unidirectional distribution andcross-ply arrangement are discussed. Moreover, the role of rotation angle, impact velocity and the plate dimension on helicoidal laminates' LVI performances are analyzed quantitatively. There is evidence that helical layouts are better able to absorb energy and delay the in-plane damage.HighlightsThe LVI responses of bio-inspired single-helicoidal (SH) and double-helicoidal (DH) composite laminate are studied.An effective model to predict the LVI responses considered the post-impact damage is developed.A comparison of the LVI performance of single-helicoidal structures with various lay-up schemes is carried out.DH structure has better low velocity impact resistance than SH structure when the rotation angle shares the same. LVI performances prediction for general bio-inspired helicoidal laminates.image