Fiber-regulated vibration suppression and mechanical behavior of CFRP corrugated channel cored sandwich structures

A novel composite corrugated channel cored sandwich structure (CCSS) with low-frequency vibration suppression function and mechanical properties was proposed and prepared based on the typical work vibration spectrum of aero-engines. The multi-level bandgap is realized by using the first/second bending modes of the composite local resonator which composed of corrugated cantilever beam-mass system. According to the anisotropy of carbon fiber reinforced polymers (CFRP), this paper achieves effective regulation of the vibration suppression range by the fiber angle under the constant geometrical configuration. The first and second fiber-regulated vibration suppression ranges are 36–114 Hz and 219–580 Hz, respectively. By comparing the dispersion spectrum against the experimental and numerical transmission curves, the effectiveness of the structural vibration suppression function is confirmed. Additionally, the mechanical properties of the CCSS are evaluated by three-point bending and out-of-plane compression test. This proposed structure can match the basic mechanical requirements of an aero-engine and cover the basic work vibration range of the engine.