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Polymer and their composites are used in many engineering applications as an alternate of metals, because of the parameters such as low cost, light weight and durability. Hybridization is a process of mixing two or more similar or dissimilar materials. It increases the performance and efficiency. In this study investigation has been made on mechanical properties of HDPE polymer based hybrid composites fabricated from the effect of various synthetic fibers (SGF ,PTFE,SCF), synthetic fillers(Silica, hydroxyapatite, zirconia) by melt mixing method using twin screw extruder followed by injection molding technique. The mechanical properties of the samples such as tensile test, flexural test were measured by universal testing machine. And the impact test was performed on Izod impact testing machine. The results show that the tensile strength of hybrid composite TR-4 sample increases compared to other composites. Flexural strength of sample TR-6 shows highest flexural strength comparted to others. The impact strength increases when the filler materials 2% of zirconia and 2% of hydroxyapatite are added to composite material i.e. is TR-6 sample.

Boron carbide (B4C) particulate and Copper coated Basalt fiber reinforced Al2014 composites were fabricated by stir casting technique. Boron carbide particles and short copper coated basalt fiber were varied from 2 wt. % to 8 wt. % in steps of 2 %. To improve the interfacial bonding between basalt fiber and matrix Al2014 alloy, the fibers are coated with copper by electroless deposition method. The Scanning Electron Microscope (SEM) clearly shows the uniform coating of copper on the surface of fiber and also observed that, increased wt % of reinforcement in ascast composites results in momentous progress in fatigue strength. The addition of boron carbide shows better fatigue strength compared to the addition of copper coated basalt fiber in Al2014. The Heat treated hybrid composites for all weight % of reinforcement’s shows 1.2 to 2 % better fatigue life as compared to ascast composites. This may be due to the refinement of grains and development of strong intermolecular bonding between the particles of composites. The fracture analysis done by SEM, clearly revealed that the crack initiated from the region of voids or porosity in the matrix and not in the region of boron carbide and copper coated basalt fiber interface.

Polymer systems like epoxies are not generally used in the manufacturing of structures on their own since they possess an ordinary level of mechanical properties. Hence, different reinforcing fibre...