Solid Mechanics Assignment Lab Report Example | Topics and Well Written Essays - 2000 words

Solid Mechanics Assignment - Lab Report Exampleafter the model was imported to ALGOR FEA the pound was checked to ensure that there were no import errors or missing geometry. Then a obstinate boundary ensure was applied to the internal progress of the larger cylinder after which a normal advertise of 500 N was applied to the internal surface of the sm aloneer cylinder. The application of a fixed boundary condition to one area of the model meant that the model was constrained from moving within that axis of whirling or translation. The model could either arise on the longitudinal axis of the constrained cylinder or it could translate in either three directions (x, y and z). Implementing a fixed boundary condition indicates that the model is unable to move in any direction at all. Generally a fixed boundary condition can be considered like to a welded piece that is unable to move but can bend or flex under applied force. Though this may not feign the actual conditions one on o ne (where the crank actually rotates though it does not translate at all), but it does provide a satisfactory numeral investigation model. Furthermore the application of a normal force to the other cylinders internal surface indicates the application of normal average force when the crank will be in use. This application of force assumes that the pin attached to the smaller cylinder of the crank will be able to persuade the applied force at the pedal completely and uniformly all across the surface of the cylinder and that this force will be normal to the provided surface. except practically this is not going to be possible as the pin will bear some kind of clearance to ensure free rotation and the clearance in turn will mean that the pin will contact the cylinder non-uniformly. Moreover the pins contact will gain a normal force at areas with complete contact while they will produce slightly skewed forces where the cylinder only partially contacts the render surface. This method of applying a force to the model is non ideal yet the approximation is tolerable enough because what will take place inside the cylinder is similar. all differences in force will not be very significant so using normal forces application is a feasible technique. The model was given a material of Steel 4130 which was present in the softwares library. After this the model was interlaceed using default settings. After lock ining the model was simulated for calculating the developed stress and for the FOS (factor of safety) calculations. The results for the first run are shown below. The mesh was redefined for element size (which was lowered) although the mesh was still ground on a 4 point Jacobian approach. The newly meshed model was then simulated in order to see the effects of a changed mesh size on the numerical investigation. The results from the re-meshed run are shown below. The results above clearly indicate that the stress distribution levels and the FOS distribution did not change at all indicating that the previous mesh control was providing a mesh independent solution. Therefore for the purpose of this analysis and optimisation the previous mesh controls were re-implemented as a mesh independent solution had been achieved. The results above clearly show that the lowest FOS is very high which indicates a rather overdesigned scenario. The current situation dictates that the FOS ought to be around 31 for a viable design. In order to achieve a more suitable FOS the design was optimised for a