Mohr’s angle must be the same as eignevectors, if you are doing the correct dot product of the correct eigenvector. I’ve checked this on problems, including this one!

]]>In my search of fully understanding eigenvectors & eigenvalues (applied to mechanics, data analysis, linear algebra) I’m stucked with a detail on the 4a chapter’s video. I do not understand why Mohr’s angle is different from the obtained with eigenvectors; actually, the value is 18.4º yet, one is measured from the right of the Y axis, and the other from the left of Y axis, then it is not the same angle (I am confident about the fact I am missing some detail which is key to understand why it is somehow the same result).

Finally, I’d like to ask why we multiply R’*S*R when we want to rotate stress tensor, instead of doing S*R directly.

In any case, I really appreciate your time and effort, your lessons are outstanding, so are you.

Regards.

]]>Widmanstatten alpha is nearly the same idea as colony alpha. Both are regular alpha formed out of the beta that grows from the grain boundaries. The distinction between the two terms isn't all that precise in the literature. The term Widmanstatten appeals to the phenomenon of Widmanstatten ferrite in steels.

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