How can I quantify the importance of a negative modal covariance diagonal value in a psd solution?
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First use OUTPR,NSOL,1 to see the modal covariance table in the output. The contribution of a negative quantity on the diagonal can be evaluated by reading the mode in POST1 with a factor equal to the square root of the variance. The stresses obtained this way can be compared to the 1 sigma values for relevance. |
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