ANALISIS TEGANGAN RANCANGAN RANGKA SEPEDA TREADMILL HYBRID HELICLE MENGGUNAKAN MATERIAL ALUMINIUM SERI 6061

The helicle hybrid treadmill bicycle is a new innovation from an energy-efficient vehicle designed to overcome the problems that exist in Indonesia such as congestion, air pollution, mental disorders and physical health. This bicycle is named the healty life bicycle (helicle). The working mechanism of this bicycle is to combine walking and cycling activities with the help of an electric motor and the transmission system which is designed efficiently and ergonomically. Design and modification of the frame between an electric bicycle and a treadmill. By simulating the design stress strength of the frame using software Autodesk Inventor 2017 x64. The analysis of the strength of the bicycle frame treadmill has several stages, namely: literature study, formulating a problem, making a bicycle frame model with CAD software, material selection, static analysis and running simulation, end program: von mises, displacement and safety factors, discussion and analysis results. Bike frame simulation helicle hybrid treadmill this has specifications, namely: a frame with dimensions of 1748 x 559 x 690 mm, a motor brushless DC 350 W with a power of 36 V, a running board made of MDF wood (Medium Density Fiberboard) with a size of 67 x 54 x 2 cm. The design and analysis on the frame using material aluminum alloy (AA) 6061 with specifications, namely: young's modulus 68.9 GPa, shear modulus obtained 25,9 GPa, density 2.7 g/cm3 , yield strength 275 MPa, tensile strength 310 MPa, that is, the frame is able to withstand a maximum load of 110 kg with a maximum frame stress of 36.13 N/mm2. The simulation results obtained are: von Mises stress 84.91 Mpa, displacement 0.934 mm and safety factor 3.28 ul. The calculated safety factor is 7.61, which is greater than the material permit safety factor of 3, so the design is said to be safe.