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Engineering Expert Witness Case Study:
Consumer Cart Split Rim Failure


The tires on a consumer cart were misread and overinflated. One rim failed catastrophically causing injuries to the person using the cart. Finite element models of the split rim design were used to estimate the stress levels and deflections in the rim at various inflation pressures. Hand calculations using readily-available formulas verified the magnitude of the finite element estimates. Opinions expressed included that the split rim design did not provide an adequate factor of safety at the labeled working pressure, and that overinflating the tire would highly overstress the rim. case study

 
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