Additive manufacturing (AM) process builds the parts, layer by layer precisely from Computer-Aided Design (CAD) models, whereas traditional subtractive manufacturing process removes layers from materials to attain the desired shape. Of late Rapid prototyped (RP) parts are used for the direct production of components for manufacturing and testing in the industries. Understanding material, machine used along with the process variables that affect the strength of the final part gains importance as the parts can be printed directly from CAD data and effectively integrated into structures. The main aim of this investigation is to present the mechanical characterization and free vibration analysis of various 3D printed Engineering Plastic Materials. Acrylonitrile Butadiene Styrene (ABS), Polycarbonate (PC), and Polycarbonate-Acrylonitrile Butadiene Styrene (PC-ABS) materials are used in this study. Spools are prepared from plastic pellets using wire extruder. Tensile tests have been performed on dog bone specimens to evaluate strength, fractured specimen's surfaces which are further evaluated using Field Emission Scanning Electron Microscope (FESEM) to explore fracture of the raster and bonding between layers. From the experimental results it's noticed that the PC-ABS material exhibits improved elastic limit and load-carrying capacity compared with ABS and PC. Three types of beams are fabricated using different materials and modal analysis has been conducted to predict the stiffness of beams in terms of natural frequencies under clamped free (CF) and clamped clamped (CC) end conditions. Higher natural frequencies observed with PC-ABS is compared with the rest of the materials.

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Recently, polymer composite materials are the most widely used elements in engineering applications. In this work, hybrid polymer composites of epoxy (E) reinforced with sisal (SF), banana (BF), coir (CF) and sisal/banana/coir (SBCF) fibers were fabricated by compression molding process.

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Abrasive water jet machining is unconventional material removal process used to dissolve openings and cavities by the force of rough particles of the slurry on hard and materials. It is a non traditional machining process able to machine wide scope of hard to cut materials such as alloys, composite materials. This work explores the impact of different process parameters on kerf angle and amount of materials removed which are imperative execution measures in abrasive waterjet machining. The variable abrasive water jet parameters considered here include water pressure, nozzle diameter stand-off distance and abrasive flow rate. Experiments were conducted on carbon fibre reinforced polymer composites by varying these parameters. This work concluded that maximum abrasive jet pressure increase the material removal rate and minimum stand off distance (SOD) will decrease the kerf angle in carbon fibre composites.

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