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svidrod (Civil/Environmental) (OP)
10 Apr 07 18:18
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.
GregLocock (Automotive)
10 Apr 07 19:40
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

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

svidrod (Civil/Environmental) (OP)
11 Apr 07 0:17
i do not know how to plot a circle given its center and radius.
GregLocock (Automotive)
11 Apr 07 3:06
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.

joerd (Chemical)
11 Apr 07 10:19
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.

svidrod (Civil/Environmental) (OP)
11 Apr 07 14:01
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.
GregLocock (Automotive)
11 Apr 07 17:19
http://www.netsoc.tcd.ie/~jgilbert/maths_site/applets/circles/tangents_to_circles.html

etc

Cheers

Greg Locock

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

svidrod (Civil/Environmental) (OP)
11 Apr 07 17:27
thanks a bunch!

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