DAMPED VIBRATION ANALYSIS OF COMPOSITE SIMPLY SUPPORTED BEAM

In this research the natural frequency of composite simply supported beam (steel +cast iron),with and without cracks at three different locations namely at 22cm ,44cm,and 66cm is investigated experimentally using universal vibration apparatus. The beam is made up of composite material of steel and cast iron with dimension (L*W*H= 1.095m*0.023m*0.012m) and E=157 GPA. A comparison is made by using damper with two different oils namely SAEJ1703F and 20W40, for both situations with and without crack. Oil SAEJ1703F gives better damping capacity than 20W40.