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Old Mar 9th 2016, 05:28 AM   #1
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Shear stress formula

how to get the formula of shear stress (tau) ? i got (-dp/ds -ydz/ds )(r/2) instead of -d(p+yz)/ ds (r/2) as in the book , if it's d(p+yz)/ ds (r/2) m , i would get (-dp/ds -ydz/ds-z(dy/ds) )(r/2) ,, right ?
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Old Mar 9th 2016, 05:54 PM   #2
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Originally Posted by ling233 View Post
how to get the formula of shear stress (tau) ? i got (-dp/ds -ydz/ds )(r/2) instead of -d(p+yz)/ ds (r/2) as in the book , if it's d(p+yz)/ ds (r/2) m , i would get (-dp/ds -ydz/ds-z(dy/ds) )(r/2) ,, right ?
anyone her?
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Old Mar 10th 2016, 06:39 AM   #3
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You used the symbol 'y' in your formula, but it's actually gamma. I haven't looked at this very closely, but I assume that gamma is a constant, so your version and the book's versions are identical.

Last edited by ChipB; Mar 10th 2016 at 06:43 AM.
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Old Mar 10th 2016, 05:37 PM   #4
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Originally Posted by ChipB View Post
You used the symbol 'y' in your formula, but it's actually gamma. I haven't looked at this very closely, but I assume that gamma is a constant, so your version and the book's versions are identical.
the y actually stands for specific weight
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