The KSCON command, as you have pointed out, can be applied to one ANSYS
area at a time. So your solution will be to create a number of areas
in your domain. My suggestion is to create areas as shown in the
attached diagram. The basic process is outlined below.
1) Create boxes around each crack tip.
2) Partition the rest of the domain using the boxes as reference.
3)
Within each box extend the crack tip so that it intersects the box
(shown in green). Create a key point at the intersection.
4) At the crack tip create two key points.
5) Also create two key points where the original crack intersects the box.
6) Create two independent areas on each side of the crack inside the box.
7) Use KSCON to create quarter point elements at the crack tip for each area on the two sides of the crack.
8) Mesh the areas inside the box.
9) Merge the nodes on either side of the crack that are in the intact solid.
The process can get quite complicated if you have a number of cracks. I don't know of a simpler automated method.
You may have to select the nodes inside each area manually (using a box
selection, for instance) and then merge them. If NUMMRG, NODE merges
the unselected nodes, your other option is to tie the nodes together
one by one using the CP command or using the CPINTF command.
I'm also trying to model crack propagation using ANSYS software in my thesis.
I've got a question concerning crack tip mesh. I'm modeling eliptic surface crack in a plate using CTMOPT macro and KSCON commant but I face some issues.
First of all CTMOPT is ok but I don't have any control on crack sourronding cube so in fact I can't propagate my crack really deep. The cube like sructure lines and areas intersect with base plate areas. What is more i have no clue how to use this macro to create through crack but with crack tip nodes laying on spline.
This problem is solved when I do mesh manually.
I sweept mesch along eliptic line (or any other line) from 2D mesh but I can't guess how to increase number of layers above 2. So KSCON gives me two rows of mapped elements in radial direction but I'd like to have at least 4.
I saw codes using elements generated on nodes, but it's not comfortable solution as I don't know how to create area from elements.
Please give me a tip how to increase number of layers in radial direction.
Re: Multiple cracks in ANSYS
The KSCON command, as you have pointed out, can be applied to one ANSYS
area at a time. So your solution will be to create a number of areas
in your domain. My suggestion is to create areas as shown in the
attached diagram. The basic process is outlined below.
1) Create boxes around each crack tip.
2) Partition the rest of the domain using the boxes as reference.
3)
Within each box extend the crack tip so that it intersects the box
(shown in green). Create a key point at the intersection.
4) At the crack tip create two key points.
5) Also create two key points where the original crack intersects the box.
6) Create two independent areas on each side of the crack inside the box.
7) Use KSCON to create quarter point elements at the crack tip for each area on the two sides of the crack.
8) Mesh the areas inside the box.
9) Merge the nodes on either side of the crack that are in the intact solid.
The process can get quite complicated if you have a number of cracks. I don't know of a simpler automated method.
-- Biswajit
In reply to Re: Multiple cracks in ANSYS by Biswajit Banerjee
Re: Multiple cracks in ANSYS (merging nodes)
You may have to select the nodes inside each area manually (using a box
selection, for instance) and then merge them. If NUMMRG, NODE merges
the unselected nodes, your other option is to tie the nodes together
one by one using the CP command or using the CPINTF command.
-- Biswajit
In reply to Re: Multiple cracks in ANSYS by Biswajit Banerjee
Hi, I'm also trying to
Hi,
I'm also trying to model crack propagation using ANSYS software in my thesis.
I've got a question concerning crack tip mesh. I'm modeling eliptic surface crack in a plate using CTMOPT macro and KSCON commant but I face some issues.
First of all CTMOPT is ok but I don't have any control on crack sourronding cube so in fact I can't propagate my crack really deep. The cube like sructure lines and areas intersect with base plate areas. What is more i have no clue how to use this macro to create through crack but with crack tip nodes laying on spline.
This problem is solved when I do mesh manually.
I sweept mesch along eliptic line (or any other line) from 2D mesh but I can't guess how to increase number of layers above 2. So KSCON gives me two rows of mapped elements in radial direction but I'd like to have at least 4.
I saw codes using elements generated on nodes, but it's not comfortable solution as I don't know how to create area from elements.
Please give me a tip how to increase number of layers in radial direction.
Kind Regards
mw