| Summary: | Helmet has been used as a safety equipment to protect human head from heavy impact that induced bad injuries and fatality, for instance traffic accidents, military and others. Furthermore, the helmet wrecked due to the accident impact will also cause heavy injuries. Thus, the helmet must be designed with a robust structure and a suitable material to shield users from the injuries. In this work, a study was carried out to analyze a standard helmet design with different materials and to understand the deformation pattern under specified velocity. Finite Element analysis (FEA) was used to analyze the helmet in different drop test orientations; longitudinal and lateral direction with different plastic materials; Acrylonitrile Butadiene Styrene (ABS), Polycarbonate (PC) and Glass-Fiber Reinforced plastic (GFR). The analysis of drop test simulation was carried out to obtain maximum von Mises stress and to calculate their safety factor as the final results. The results show that the maximum von Mises stress using different plastic materials (ABS, PC and GFR) in longitudinal drop test is found to be 41 MPa, 46 MPa and 16 MPa respectively, while in lateral drop test, the values are recorded approximately 30 MPa, 38 MPa and 6 MPa respectively. Furthermore, their safety factors for the longitudinal and lateral drop test were found to be ABS; 1.2 and 1.7, PC; 1.5 and 1.9, and GFR; 9 and 17.6 respectively. To sum up, the GFR shows the highest value of safety factor and most suitable in avoiding helmet wrecked during the drop impact.
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