Yield/Failure functions

[ptc-2239588]

Hello all, Just wondering if anyone knows how to plot the yield/failure surface of say the Mohr-Coulomb or other failure surface in MathCAD? I have a complex function to define the failure surface though am having a fair bit of difficulty plotting it in MathCAD. Any help woul dbe great!

[StuartBruff(Wor]

If you could post what you've done so far, that would be a help in giving guidance.

[ptc-2239588]

"Stuart Bruff" wrote:

If you could post what you've done so far, that would be a help in giving guidance.

[RichardJ]

It's a surface, so of course it has to be a function of 2 variables. As Stuart says, without seeing a worksheet it's tough to say much more. Richard

[ptc-2239588]

"Richard Jackson" wrote:

It's a surface, so of course it has to be a function of 2 variables. As Stuart says, without seeing a worksheet it's tough to say much more. Richard

[RichardJ]

"Anmol Bedi" wrote:

however you would think that there would be a method to plot a surface as a function of three variables on three axes (being the sig1,sig2 & sig3 axis in octahedral stress space).

[StuartBruff(Wor]

"Anmol Bedi" wrote:

however you would think that there would be a method to plot a surface as a function of three variables on three axes (being the sig1,sig2 & sig3 axis in octahedral stress space).

[RichardJ]

"Stuart Bruff" wrote:

Another way of representing it would be to use colour for the 4th dimension. Needless to say, this kind of thing has been on my request list for some time.

[ArtyomFilipov]

Like this?

[MikeArmstrong]

Nice example, but this thread is over 2 years old.

Mike

[ArtyomFilipov]

Sorry, not looked at the date. But you can always revive this interesting topic.

[MikeArmstrong]

Fully agree. Was just making you aware incase you were waiting on a reply

The only name I recognise is Richards.

Mike

[ptc-2239588]

Hi,

I've just re-checked this after a long time, and actually this is exactly what I am after!

Can you please still help with this?

Cheers,

A.

[ArtyomFilipov]

Hi.

I'll try.

At first, creates the function for plot surface in cylindrical coordinate system:

R(Z,thetta)

Angel range is -60deg...+60deg

The Z-axes in this function is the resultant of stresses sigm1 and sigm2 (or sigm2 and sigm3, or sigm1 and sigm3 -- it dosn't matter)

Then function R(Z,thetta) reduse to 6 functions in Cartesian coordinate system FX(Z,thetta+A) and FY(Z,thetta+A). The A = -150deg, -30deg and 90deg for every pair of functions (why it's so -- I don't remember).

Then using affine transformation rotate functions FX and FY around Y and Z axes.

Then creates Mesh and Plot ))

Example: https://www.dropbox.com/s/dr3lpscloub7fh0/123456-1.xmcd

[Werner_E]

Example: https://www.dropbox.com/s/dr3lpscloub7fh0/123456-1.xmcd

You can attach files directly here if you chose "Use advanced editor" at the upper right.

[ArtyomFilipov]

ok.

[VladimirN]

Please see in attachment.

[Werner_E]

VladimirN. wrote:

Please see in attachment.

??? Did you post the wrong file?

The file you posted is exactly the same file w/o modifications which already Artyom posted above!