## Help with Meshing blunt crack tip

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**1**of**1**### Help with Meshing blunt crack tip

I have geometry with a blunt crack tip, model as semi-circle (quarter circle for symmetry model). I want to use a radial mesh around this blunt crack. I want the mesh to look similar to what other people are doing (see attached geo1.png) .

I understand that a square is drawn around the blunt crack tip. Then this square and area around the blunt crack is decompose to "fan" parts. These parts is then mesh using the mapping scheme (see attached geo2.png)

I don't know how they get this nice mesh radially surround the blunt crack tip see geo3.png for one type

and geo4.png for another type.

Any tips of how to get this type of mesh around the blunt crack will be much appreciated. How to do it and what is the best way to do it?

Thanks,

I understand that a square is drawn around the blunt crack tip. Then this square and area around the blunt crack is decompose to "fan" parts. These parts is then mesh using the mapping scheme (see attached geo2.png)

I don't know how they get this nice mesh radially surround the blunt crack tip see geo3.png for one type

and geo4.png for another type.

Any tips of how to get this type of mesh around the blunt crack will be much appreciated. How to do it and what is the best way to do it?

Thanks,

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- xlao
**Posts:**18**Joined:**Wed Jan 11, 2017 3:06 pm

### Re: Help with Meshing blunt crack tip

One way to do this is to create four sides and map the surface. In my picture, the orange surface already has four curves, so a map scheme works. For the yellow surface, I split the bottom curve at an arbitrary location to create a fourth curve so that the surface can be mapped.

Here is an example

reset

#Create the model

create surface rectangle width 10 height 5 zplane

create vertex on curve 3 midpoint

create surface circle radius .1 zplane

create surface circle radius 3 zplane

move Surface 2 location vertex 5 include_merged

move Surface 3 location vertex 5 include_merged

subtract surface 2 from surface 1

imprint surface 4 with curve 6

del surf 3

create vertex on curve 1 close_to vertex 5

create vertex on curve 7 close_to vertex 12

create vertex on curve 2 distance .1 from vertex 3

create curve vertex 13 14

imprint surface 5 6 with curve 15

del curve 15

del surface 9 10

create vertex on curve 1 close_to vertex 15

split surface 7 8 through vertex 15 18

del vertex all

#Split the bottom curve and set intervals

split curve 16 distance .75 from vertex 15

curve 17 25 28 31 interval 12

mesh surface 12 13

Here is an example

reset

#Create the model

create surface rectangle width 10 height 5 zplane

create vertex on curve 3 midpoint

create surface circle radius .1 zplane

create surface circle radius 3 zplane

move Surface 2 location vertex 5 include_merged

move Surface 3 location vertex 5 include_merged

subtract surface 2 from surface 1

imprint surface 4 with curve 6

del surf 3

create vertex on curve 1 close_to vertex 5

create vertex on curve 7 close_to vertex 12

create vertex on curve 2 distance .1 from vertex 3

create curve vertex 13 14

imprint surface 5 6 with curve 15

del curve 15

del surface 9 10

create vertex on curve 1 close_to vertex 15

split surface 7 8 through vertex 15 18

del vertex all

#Split the bottom curve and set intervals

split curve 16 distance .75 from vertex 15

curve 17 25 28 31 interval 12

mesh surface 12 13

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csimsoft

- csimsoft Moderator
**Posts:**292**Joined:**Tue Feb 14, 2012 5:59 pm**Location:**American Fork, UT

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