Mechanical behaviors of carbon fiber composite three dimensional latttice grid structures

Abstract eng:
Mechanical properties and failure modes of carbon fiber composite Egg and pyramidal grids cores were studied in present paper. Interlocking method has been developed for both kinds of three dimensional grids. The out of plane compression, in-plane compression and three point bending responses of the both panels were tested until failure. Crushing mode and energy absorption in quasi-static uniform compression have been investigated. Euler or core shear macro-buckling, face wrinkling, face inter-cell buckling and face sheet crushing were considered and theoretical relationships for predicting the failure load associated with each mode were presented under in plane compression. Face wrinkling and core debonding have been investigated under three point bending. Failure mechanism maps were constructed to predict the failure of composite sandwich panels with pyramidal and egg grid cores subjected to in plane compression and bending.

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