Abstract
When a Fiber Reinforced Plastics(FRP) is used as a structure, it is necessary to design the dynamic property of FRP easily and accurately. In this paper, a natural frequency and loss factor of FRP is calculated by our equivalent mass-spring method. The FRP is expressed as equivalent homogeneous elements by the rule of mixture. The equivalent mass-spring model is expressed by shear springs of fiber and matrix resin which connect in series. The spring coefficients are identified by the sensitivity analysis. Then matrix resin is viscoelastic, the shear spring is presented by kmj(1+ηmi). Therefore, the loss factor of FRP is calculated by dividing imaginary part of the total shear spring coefficient by real one. When the parameters or size of FRP are changed, the natural frequency and loss factor is calculated by corrected spring coefficients of fiber and resin. This method is sufficiently reliable and easy to predict the vibration characteristics of FRP.
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