Drawing powder bed for laser 3D printing using 2 sets (different radii) of 600 spheres touching each other and assigning thermal values to them using create pde

laser metal printing powder bed: i want to draw 2 sets of 600 * 600 * 600 spheres. radi=25 microns, radi2=10.35 microns.

each sphere has to be assigned thermal properties after attaching spheres to a pde thermal model.Please help.

gaussian laser beam has to be modeled and shunned at this powder bed. if can help in laser beam modeling, please help.

Answer 1

[Hari]

Hi Adnan Husain Sheikh,

I understand you want to model two sets of spheres, each comprising 600x600x600 spheres with radii of 25 microns and 10.35 microns, respectively. These spheres will be part of a powder bed for laser metal printing, and you aim to assign them thermal properties within a PDE model.

Here are steps you can follow to acheive the same:

1. Sphere Generation: Due to the sheer number of spheres (600x600x600), directly modeling each sphere may not be computationally effective. Consider simplifying the model or focusing on a representative subset of the entire powder bed for detailed analysis.
2. Assigning Thermal Properties: Once you have your simplified or representative model, you can use PDE toolbox in MATLAB to define the thermal properties of the spheres. This involves creating a PDE model and assigning material properties.
3. Gaussian Laser Beam Modeling: The Gaussian laser beam can be modeled as a heat source with a spatial distribution defined by the Gaussian function. This will be applied to the PDE model as either a boundary condition or a volumetric heat source, depending on your simulation needs.

References:

• For general information on creating PDE models in MATLAB, refer to the documentation of "createpde": https://www.mathworks.com/help/pde/ug/createpde.html.
• On assigning material properties in a PDE model, look into: https://www.mathworks.com/help/pde/ug/pde.materialproperties.html

Hope this helps!