Análise de tensão na estrutura de um banco de trator para fins de redução dos riscos de acidentes durante a ignição de tratores

Abstract

Mechanization in agriculture has grown significantly in recent decades to meet the growing production demand. Inconsequently, work accidents during the operation of agricultural machinery was also increased. For this reason, rural working-people are exposed to situations of risk and it is needed the development of new devices to reduce the risk of accidents. Based on that, this work is aimed to perform static structural analysis on the tractor seat in order to understand the von Mises stress distribution and to indicate an appropriate place to install a safety device to reduce the risk of accidents during the ignition procedure of tractors. In this case, the ignition will be carried out if the load exerted by the operator's weight on the seat is greater than the average load of a child and if the operator is correctly positioned on the seat during ignition. For this, a unidirectional strain gage was installed in the place of greatest stress of von Mises in the tractor seat in order to validate the results of the simulation. The results of the experimental stress values were compared with the stress values obtained in the simulation, generating a satisfactory average difference of 11.4% with a linear correlation coefficient (R2) of 0.9997. In this way, the results of the simulations in the tractor seat, when subjected to external loads, allowed the understanding of the distribution of stresses in the structure and indicated an appropriate place for the installation of the safety device (region of greatest stress in the seat) in order to predict work accidents with children weighing up to 415.8 N.