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# plotting mohr-coulomb failure envelope in excel

## plotting mohr-coulomb failure envelope in excel

(OP)
I am trying to plot a Mohr-Coulomb failure envelope in excel.  I can't figure out how to get excel to plot the Mohr's circle along the x axis given the two stresses.

### RE: plotting mohr-coulomb failure envelope in excel

Do you not know how to plot a circle, given its centre and radius, or do you not know the centre and radius of the circle?

Cheers

Greg Locock

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### RE: plotting mohr-coulomb failure envelope in excel

(OP)
i do not know how to plot a circle given its center and radius.

### RE: plotting mohr-coulomb failure envelope in excel

Create a column of angles from 0 to 2 pi, each of those is theta in the following equations.
x=x0+r*sin(theta)
y=y0+r*cos(theta)

Cheers

Greg Locock

Please see FAQ731-376 for tips on how to make the best use of Eng-Tips.

### RE: plotting mohr-coulomb failure envelope in excel

Don't forget to use a scatter plot when plotting y vs. x

Cheers,
Joerd

Please see FAQ731-376 for tips on how to make the best use of Eng-Tips.

### RE: plotting mohr-coulomb failure envelope in excel

(OP)
alright, i got the circle to work just fine, thanks.  now, how would i plot a straight line with one end fixed and the other end tangent to said circle.

### RE: plotting mohr-coulomb failure envelope in excel

(OP)
thanks a bunch!

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