CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Software User Forums > FLOW-3D

Melt pool Width and Bead shape in LPBF

Register Blogs Community New Posts Updated Threads Search

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   October 19, 2024, 00:03
Lightbulb Melt pool Width and Bead shape in LPBF
  #1
New Member
 
Ankita
Join Date: Oct 2024
Posts: 3
Rep Power: 2
asahu is on a distinguished road
Hi,

I am working on a LPBF simulation, I get the correct melt pool depth but have large discrepancies in melt pool width.

Also, I do not see the semicircular bead after taking a slice along the track length. There are sufficient cells to capture the bead height but still I don't see any projection above the substrate. My simulation has all the 3 modes of heat transfer and is in conduction regime.

If anybody knows how to fix this, please share.

Thanks,
Ankita
asahu is offline   Reply With Quote

Old   October 21, 2024, 02:23
Default
  #2
New Member
 
Robert
Join Date: Jan 2024
Location: Austria
Posts: 10
Rep Power: 2
RobAM is on a distinguished road
Hi!
Have you tried playing around with plume scattering? This might be a good starting point.
Regarding the morphology, in my experience the mesh needs to be fine enough in relation to the spot size to resolve this issue.
What spot size and grid size are you working with?
RobAM is offline   Reply With Quote

Old   October 21, 2024, 17:14
Default
  #3
New Member
 
Ankita
Join Date: Oct 2024
Posts: 3
Rep Power: 2
asahu is on a distinguished road
Thank you for your response.

I will try plume scattering. I used 100 um spot size and 15 um mesh cell size.
asahu is offline   Reply With Quote

Old   October 22, 2024, 02:25
Default
  #4
New Member
 
Robert
Join Date: Jan 2024
Location: Austria
Posts: 10
Rep Power: 2
RobAM is on a distinguished road
Definitely try to decrease the cell size.
Otherwise the influence of one cell's state (liquid/solid) is disproportionally large compared to your spot size.
RobAM is offline   Reply With Quote

Old   October 22, 2024, 06:56
Default
  #5
New Member
 
Ankita
Join Date: Oct 2024
Posts: 3
Rep Power: 2
asahu is on a distinguished road
Sure, will do that.

Can you provide some information on how to use the plume scattering option ? I noticed we have to input a value for 'rfplume' (radius). There is also an attenuation factor of heat source power. Should I specify 50 um as 'rfplume' since my spot size is 100 um ?
asahu is offline   Reply With Quote

Old   October 22, 2024, 08:08
Default
  #6
New Member
 
Robert
Join Date: Jan 2024
Location: Austria
Posts: 10
Rep Power: 2
RobAM is on a distinguished road
imho I think it's best to try different settings for your specific problem-material-combination to validate with your experimental data.
RobAM is offline   Reply With Quote

Reply

Tags
bead shape, track width


Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On



All times are GMT -4. The time now is 21:30.