Deflection values are sometimes visually exaggerated so the engineer can see
where and how the
structure is flexing and if it is as expected. This can also show part to part
contact - or lack thereof. Simple rectangular boxes under
uniform external hydrostatic pressure load should exhibit maximum deflection at the
center of the largest surface with maximum stresses at the midpoint of the
longest edges. Stress raisers caused by internal fillets and bosses will act as
stress concentration factors and raise the stresses at those locations. These things can be
verified by inspection of the FEA results. Quantitative quality checking would be achieved through
multiple convergence runs plus other techniques such as simplified manual
calculations. While FEA can reduce the need for physical testing, it should
never be eliminated completely. The videos show the result of changing the
external hydrostatic pressure from 0 to 300 FSW.
Pressure Resistant Oceanographic Instrument Housing
Depth = 0 to 300 FSW
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