There is an increasing amount of plastic waste generated all around the world, especially by developed countries. Polyethylene Terephthalate (PET) is one of the most widely used plastics in the world and after recycling it should be used economically and productively. The need to develop an appropriate use for recycled material is imminent. A composite is developed using recycled PET matrix reinforced with fiberglass powder, sawdust and gypsum to maximize the sustainable potential of recycled materials. Izod Impact test specimens with varying weight fraction of fiberglass powder as 12%, 15%, and 19% made as per ASTM D256 standard are tested and the results are discussed in this paper.
Practically, most systems possess characteristics of both viscous damping and Coulomb damping. A model of combined viscous and Coulomb damping is analysed while taking into account the different nature of materials. Different material contact surfaces exhibit distinct coefficients of friction which has an effect on the displacement response of a vibratory system. The study involves analysis of a linear spring-mass damper system by varying its material parameters, taking frictional force into account. The response in terms of maximum displacement amplitude is examined while varying the values of coefficient of friction. Material parameters such as natural frequency (varied by mass and stiffness each), damping ratio and coefficient of friction are studied. The research is conducted using theory of combined viscous and dry friction damping and graphical observations are made to study the response in view of different surface contacts.
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