Learning Forum

[Jonas S]

Hello, 

I am trying to use the DED process simulation in Ansys Mechanical to map the temperature profile in the part during the build process. Of particular interest is whether the previous layer is cold enough to place a new layer on top of it. However, I am surprised that no matter how many layers have already been placed, there is no heat building up in the part. The previous layer has alwas cooled down below 100°C immediately (even without any interlayer cooling time [dwell]) . Only the last layer seems to cool down realistically. As you can tell from the picture below even the previosly deposited elementcluster cools down immediately (within less than 0,5 seconds). I doubt that this corresponds to the cooling process in reality.

Therefore, my question is whether it is even possible with the DED simulation in Mechanical to map the temperature curve accurately enough to be able to decide at which layers a pause time (dwell) would be required?

Thanks in advance

Jonas

[Ashish Khemka]

Hi Jonas,

Please see if the following link helps: Additive manufacturing process (DED) simulation help (ansys.com)

Regards,

Ashish Khemka

[Jonas S]

Thanks for the quick reply
I have looked at the suggested discussion, but unfortunately this does not answer my question. Mr. Doyle's answer refers to the simulation of the LPBF method (temperature simulation layer by layer). However, in the DED process the temperature simulation is done along the tool path, the only question is whether this is sufficiently accurate to check the build strategy. 
Perhaps I will ask the question again in a different way: 
Which heat source is used in the DED process simulation?
Are the individual element clusters "only" added with the previously defined process temperature and therefore only have an influence on the underlying layers through the heat transfer?
Or is a heat source (e.g. Goldak double ellipsoid) used in the background to take into account the effect of the welding process on the underlying layers? - If not, could such a heat source be integrated into the DED simulation? 

Regards,

Jonas