The covariance was calculated directly from the cmm

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Unformatted text preview: residual stresses throughout each compliant part due to assembly are obtained from the mean and covariance of the part misalignment. An individual FE solution is performed for each compliant part, where the part has prescribed displacements at all mating edges. Two FE solutions provide maximum and minimum values for the springback and stress or, if a statistical solution is required, SFEM is used. Typically, the misalignment is small and the problem is treated as linear, elastic with small variations. If the variations are too large to be treated in this way, the resultant springback and residual stress would likely render the assembly unfit for use. After the residual stresses and springback are found for each part, the performance of the assembly can be evaluated. If the stresses and springback violate design constraints, the critical tolerances are iterated until the performance is within design limits. To identify the critical tolerances, the critical closure points are identified with an FE sensitivity analysis and the critical to...
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This note was uploaded on 08/03/2010 for the course DD 1234 taught by Professor Zczxc during the Spring '10 term at Magnolia Bible.

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