This paper represents vibration analysis of Sisal fiber reinforced epoxy based composites using Fast Fourier Transform (FFT) analyzer. The composites were prepared by melt-mixing method, followed by compression molding process. The percentage of sisal fiber is varied from 4% to 10% in steps of 2%. Thermo gravimetric analysis (TGA) is done to understand moisture absorption and moisture content. We also report vibrational analysis to understand the influence of fiber loading on natural frequency and damping coefficient.
The aim of this work is to study the influence of sisal fiber content on mechanical (i.e. tensile, flexural, impact, hardness and abrasion resistance) and thermal (i.e. TGA) properties of composites by varying the fiber and epoxy percentage. The composite was prepared by melt-mixing method, followed by compression molding process. The percentage of sisal fiber is varied from 4% to 10% in steps of 2%. Similarly epoxy content is varied from 96% to 90% in steps of 2%. Detailed mechanical Properties of Sisal Fiber Reinforced Polymer Composites have been studied. The major mechanical properties viz Tensile, Hardness, Impact, Flexural, Moisture absorption, and Moisture content are studied.
A novel interpretation of the vertical magnetic effect of a sphere is developed using Fourier transforms. Since the analytical expression of the magnetic effect of a sphere defies Fourier transformation, it is squared and the Fourier transform of the square is obtained. From the real and imaginary components of the Fourier transform the depth to the centre of the sphere, the angle of magnetic polariza tion, and the radius of the sphere are obtained. The validity of the method is tested on four theoretical models. Also, a field example from the Bankura area in West Bengal (India) is tested and the evaluated parameters agree with those previously obtained by Rao et al. (1977). An advantage of the present method is that location of the origin is not necessary. The method can be run by computer to determine the parameters of the causative body.
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