PCB (FR4) material properties

Geometry and Materials
3

Hello Dmitrii,

Please find here an input file with an example implementation of FR4 material: PCB_material.inp (4.5 KB).

Please note the following:

  1. The choice of which material is completely up to you and you should cross-check that it is the one you desire for your application. All the values implemented here are to serve as an example:
  • the epoxy is the default from the material database.
  • the fibre glass composition is taken from this paper. All the individual compounds are those as from the FLUKA material database.
  • the FR4 material density was taken from this data sheet.
  • the FR4 composition I used is of 60% epoxy and 40% fibre glass, but it really depends on the quality of PCBs (good one have around 50%/50%). Feel free to use the one you found with 70%-78%.
  1. As you might already observe, you can define composite materials recursively.
  2. Regarding dE/dx, you have full control over the material properties (see slide 15 of this presentation). Moreover, dE/dx is tabulated on a per-material basis: runtime the code pulls the dE/dx from tabulations at a given material index. Instead, nuclear interactions are isotope dependent (one needs not only the element composition but the isotopic composition as well; natural isotopic composition by default).

Hope it helps and let me know if there is anything else I could help with.

Best,
Daniel

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