Damping and Vibration Analysis of Polyethylene Fiber Composite under Varied Temperature

Damping and vibration properties of polyethylene fiber composite are investigated under varied temperature. A damping monitoring method is used to experimentally measure frequency response and the frequency is obtained numerically using a finite element program. The natural frequencies of a system are a function of its elastic properties, dimensions, and mass. This concept is used to calculate theoretical vibration modes of composites. The damping properties, in terms of the damping factor, are determined by the half-power bandwidth technique. The time responses measured experimentally are compared with the numerically obtained ones. Good agreement between the 2 methods shows that numerical analysis can be used to determine the time response curve of polyethylene fiber composite. It is seen that polymer matrix composites have temperature-dependent mechanical properties. A functional relationship between temperature and damping properties of polyethylene fiber composite under varied temperature is obtained.