The linear stress analysis results highlighted areas where the stresses were too close to the material limit. The graphic to the left shows an area of a high stress concentration. These areas had to be re-designed and then re-analysed. Analysis of the re-designed components showed that the stresses experienced were acceptable.
A deflection assessment of slender parts was also carried out in accordance with the National Building Code of Canada 1985 to check for buckling collapse. All deflections were found to be within the limits specified within the code. The graphic below left shows a contour plot of the deformation experienced by the seating assembly under load.
A modal analysis using FEA was carried out to determine the fundamental vibration mode shapes and the corresponding frequencies. It was useful to know the modal frequencies of the structure to ensure that the frequency of the applied periodic loading would not coincide with a modal frequency and hence cause resonance, which could lead to large oscillations and possibly failure of the structure. The results obtained showed that resonance would not be an issue. The graphics to the right show the first and second mode shapes obtained from the modal analysis.