What Is the Role of Epoxy in the Structure of a 3D Phononic Crystal?

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In summary, the conversation discusses a 3D phononic crystal made up of lead spherical inclusions on a face-centered cubic lattice, embedded in an epoxy matrix. The problem mentioned is understanding the position of the lead inclusions and the relationship of the epoxy matrix to the lattice. The concept of a phononic crystal is to create a lattice of variations in density and elastic modulus, with the specific example being arranged in a chunk of epoxy with an FCC lattice. It is suggested that the process for creating this structure may involve arranging tiny lead balls in a close-packed structure and then filling the gaps with an epoxy resin.
  • #1
germaine
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1
the description :
"in 3D phononic crystal constitued of lead spherical inclusions on a face-centered cubic lattice embidded in an epoxy matrix"

The problem i don't understand:the position of the lead spherical inclusions.
What is the epoxy matrix, is it relative to the fcc lattice ?

Do I describe my question clearly?
Thank you...
 
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  • #2
lead sheres in a surrounding marix: think of spheres in jello in a regular array.
 
  • #3
germaine said:
the description :
"in 3D phononic crystal constitued of lead spherical inclusions on a face-centered cubic lattice embidded in an epoxy matrix"

The problem i don't understand:the position of the lead spherical inclusions.
What is the epoxy matrix, is it relative to the fcc lattice ?

Do I describe my question clearly?
Thank you...
No, you have not described your question clearly!
1. Where is this quote taken from?
2. What is the complete context?

The idea behind a phononic crystal is to create a (Bravais) lattice of variations in density and elastic modulus. Your particular lattice (Chandra, et al) is made up of spherical Pb inclusions which are arranged periodically in a chunk of epoxy. The positions of the spheres make up an FCC lattice. I imagine (and this is nothing more than a guess) you could start with a bunch of tiny Pb balls, which you first arrange in a close-packed structure, and then fill the spaces between the balls with an epoxy resin that can be cured afterwards.
 

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