304 steel paint removal analysis

- January 27, 2023 at 6:27 pm
  
  Hasan Ilker ÇELİKER
  Subscriber
  
  A surface formed by spraying 200 micrometer paint on 304 stainless steel with dimensions of 40x20x5 mm will be treated with a laser with a wavelength of 1064 nm and a pulse duration of 100 ns. For the heat to be obtained by using the Gaussian beam, a laser flux with an average power of 100 W, a maximum energy of 1 mJ from a single pulse and 20-50 J/cm2 will be applied. When I do the operation, I get a single temperature value.
  The values I am trying to achieve are as follows
- January 31, 2023 at 1:27 pm
  
  peteroznewman
  Subscriber
  
  Hasan,
  This is a Transient Thermal problem, not Steady State.
  It looks like you have a single 200 micrometer thick paint element on the surface. While you are figuring things out, start with ten 20 micrometer thick elements then reduce the element size once you get a model running. You need an element size of 1 or 2 micrometers through the thickness of the paint to get results like you show in the images.
  It looks like the steel below has a different element size. If you use bonded contact between the paint and steel, you can use a different element size, but I would expect you want larger elements in the steel given the paint element size I just suggested.
- January 31, 2023 at 2:14 pm
  
  Hasan Ilker ÇELİKER
  Subscriber
  
  So how can I reflect the heat dissipation? Here the technique of birth and death is used. I've never worked this way before.
- January 31, 2023 at 3:20 pm
  
  peteroznewman
  Subscriber
  
  The materials (paint and steel) have thermal material properties such as conductivity that will transport the heat from the hot spot to the rest of the material. Boundary conditions such as convection will transfer the heat to the environment.
  Try searching the Forum for birth and death and you will find some topics.