Damping performances of CFRP laminated periodic structures
Carbon fiber reinforced polymers(CFRP)laminated periodic structures are suitable for a variety of vibration damping devices due to their excellent damping properties.However,its vibration characteristics,such as stiffness and damping,are affected by periodic changes in the layup method and discontinuity of the fibers.According to the characteristics of the CFRP lami-nated periodic structure,a CFRP laminated periodic structure plate containing two cells in a single period along the length direction was designed,and the corresponding test samples were prepared and the free-modal test was completed to study the variation law of the damping performances of the structure.The experimental results show that with the increase of the number of periods and the proportion of cells thickness in the plate,the first-order and second-order damping loss factors gradually increase,and the first-order and second-order bending natural frequencies gradually decrease.Keeping the ply angle of one cell in CFRP laminated periodic structure unchanged,with the increase of the angle of the other cell,the first-order and second-order damping loss factors first increase and then decrease,the natural frequencies of the first and second order bending reach the maximum value when the ply angle is 15°,and then show a slight upward and downward fluctuation with the increase of the ply angle,but there is no large fluctua-tion.When the proportion of cells thickness of the CFRP laminated periodic structure plate is 50%and the number of periods is 4,the damping loss factors are increased by 19.59%and 15.63%respectively compared with the traditional CFRP laminate in the first two bending modes,and the flexural stiffness of the structure is reduced by 18.21%through the three-point flexural test results.
万方数据
维普
