Análise das forças atuantes na estrutura de um chassi de triciclo tipo halfbike

Abstract

This monograph consists of the analysis of the forces acting on the chassis of a halfbike tricycle type, which presents itself as a new concept of vehicle for transport and entertainment. The halfbike consists in a tricycle without seat, and it is moved using a set pedal/crank set similar of the mechanism of a common bicycle. This vehicle appears as one more alternative of locomotion that helps in the urban mobility problem. The study is focused on the tricycle chassis. The origina structure is changed, pursuing to find a good weight and fatigue resistance relation. Na analysis using anthropometry is made, in order to determine the dimensions of an ergonomically comfortable tricycle. Due to the presence of curves and folds which difficult its analytical calculus, the finite elements software ANSYS (Static Structural) is used to make the structural analysis of the chassis. The force of impulse in the pedal, in a slope condition, was simulated and the von-Mises equivalent stress in the structure was obtained; this stress was used to calculate the fatigue safety factor of the tricycle. The aluminum 7005-T6, which is commonly used to manufacture bicycles, is used in the calculations. It is concluded that for 50,000 cycles the material 7005-T6 satisfices as the material used to manufacture the tricycle, obtaining a safety factor of 1.07.