Abstract: In order to summarize the effects of core structures on mechanical behavior of the hollow fiber reinforcement composites, the dynamic responses of “π”shape and “O” shape core structural fiber reinforcement composites under the same compression loading condition were calculated and compared by finite element analysis (FEA) in the level of yarn core and resin. By omparatively analyzing the deflection-time curves, structural stress distributions, the locations of maximum and minimum stress and quilibrium degree of stress of the two type of composites, it was found that the deflection magnitude of the“O”shape core composite was obviously less than that of the“π”shape core composite. Moreover, for the “O”shape core composite, its stress concentration region located at the symmetrical central line of geometrical structure, which was very beneficial to the overall loading-bearing behavior of the composite structure. In addition, it may induce the greater stress equilibrium degree, all of these factors made this type of structural material to absorb and dissipate more energy during the loading process.

Key words: core structure, composite, compression resistance, finite element