ANSYS Crack Tip Meshing

[vigneshv9]

Hi,

I am trying to insert a crack in a model using the macro CTMOPT in Ansys 13.
It is a surface crack, full crack. I get an error claiming 'Please check the workplane orientation and crack dimensions'

Anyone has solutions/tutorial for proper use of this macro?

Thanks!

 

[rb1957]

is there a worked example for using this in the manual ?

have you tried the ANSYS helpdesk ??

 

[vigneshv9]

Yeah there is an example, but that's for a simple plain surface. Doesn't really help. Want to know if anyone's worked with more complex geometries or has a proper tutorial?

Thanks rb1957,btw!

 

[rb1957]

simple plane surface or not, using the macro should be the same. have you tried to copy the example ?

why do you think your geometry is complex ? does the macro work for (is appliciable to) your elements ??

 

[vigneshv9]

Hey rb1957,

Yeah, I've tried copying the example for a continous/smooth volume. My doubt is if the Macro is applicable for volumes with discontinuities/not smooth, which isn't explained. ALso, I'd like a heads up on the different parameters as well, which aren't clearly explained. A better example or explanation of its features would help.

Thanks!

 

[rb1957]

sounds like you need to talk to the helpdesk

 

[vigneshv9]

http://www.kxcad.net/ansys/ansys/ansyshelp/fractmesh.html

This is the example given, FYI. I'd like to insert a crack at the intersection of two volumes, like a step. Not able to.
A crude example would be, I would like to insert a crack at the intersection of the boss/riser and the smooth surface. Any idea?

 

[rb1957]

if you are changing parameters etc, how do you know the results are good ? you'll need to run a standard (simple) crack geometry with a known answer.

 

[vigneshv9]

Precisely. I have validated results for a standard, simple crack, by comparing with other packages to get SIFs. So the methodology seems fine. But when I move onto complicated geometries, problems creep in. More than complicated, something like the intersection I spoke about in the previous post. The macro doesn't seem to function!

 

[vigneshv9]

Also, could you run me through 'talking to the helpdesk'? Never really done it before.

Thanks

 

[rb1957]

if you have a license, you should have a number to call.

if you have a license, but no number, i'd go to their website and look for someone to call.

if you don't have a license, you're on your own !

 

[vigneshv9]

Second option
Will look for numbers. Thanks!