Abstract
Frequent failures of mechanical elements in machines and equipment due to exerted loads reveal the importance of researches and studies in this regard to optimize or redesign the parts. Practically, crossbar’s pins in moldboard plough are frequently failed. So, stress analysis of that was conducted in this study by finite element method. After drawing the three-dimensional model in Solid Works Software and transfer it to ANSYS Software, the constraints, boundary conditions and loads were applied on the model. Then the static analyses were done for the model. To estimate the exerted forces on the crossbar, the draft forces of Massey Ferguson 285 and 299 tractors were considered. The results of static analysis showed that the maximum static stresses based on von Mises criteria occur at the junction between the left and right pins with crossbar. The stress values based on Massey Ferguson 285 Tractor were 126 and 83.7 MPa, respectively, and based on Massey Ferguson 299 Tractor were 136 and 90.6 MPa, respectively. The obtained safety factors for the left and right pins were obtained as 1.57 and 2.36, respectively, based on the maximum draft of Massey Ferguson 285 Tractor and 1.45 and 2.18, respectively, based on the maximum draft of Massey Ferguson 299 Tractor. These results show the higher probability of failure at the left pin junction.
Highlights
The used equipment for cutting and pulverizing the soil, such as: rotary tiller, moldboard plough and subsoiler, are of the main tillage machinery
Finite element method is widely used in engineering problems such as static and dynamic structure
By examining the static force exerted on the crossbar of moldboard plough, the maximum stress based on von-Mises criteria was obtained for left pin
Summary
The used equipment for cutting and pulverizing the soil, such as: rotary tiller, moldboard plough and subsoiler, are of the main tillage machinery. On one hand, this equipment consumes the highest energy compare with other agricultural machinery, and on the other hand the manufacturing process and testing of this equipment are expensive. One of the critical parts of moldboard plough is crossbar which is under bending loads and breakage. Breakage of the crossbar wastes the time and costs of tillage operation. Todays, using computer aided design technique, design factors such as force, stress, deformation, optimization of machine parts and the performance of structures under loads can be simulated and analyzed more efficiently and faster [3]
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