Nonlinear finite element analysis of strength of tractor safety cab

In order to reduce fatal work-related injuries caused by tractor roll over accidents, fixing safety cabs on tractors was proved to be the best choice. A kind of large horsepower tractor safety cab integrated with roll over protective structure (ROPS) was designed. The exact three-dimensional model of the tractor cab was established, and the strength of the cab was analyzed by using non-linear finite element method. The test was simulated according to OECD codes. The cab was simulated by using beam and shell element. Rubber anti-vibration mountings fixed between the cab and front bracket of the tractor were simulated by spring element. The analysis results showed that, at end of the simulation test when the energy absorption met the requirement of the OECD codes, the maximum stress in some parts of the cab reached yield stress and appeared plastic deformation. However, the clearance zone was not infringed. During the first and second longitudinal loading test, the maximum deformation was 111 mm and 47 mm, respectively. In loading from the side test the maximum deformation of 168 mm was found. In the first and second crushing tests, the maximum deformation was 4 mm and 19 mm, respectively. The maximum deformation happened in the place where the loads were applied. Therefore, the analysis results provided a basis for designing tractor cab with ROPS which could pass the homologation tests established in OECD code 4.