Recent content by Galbi

  1. Galbi

    Water evaporation by negative pressure and 0% of RH

    Wow this is tough. I'll keep studying about it. Thank you very much.
  2. Galbi

    Water evaporation by negative pressure and 0% of RH

    The air of each container should be refreshed by air from outside. However, I don't know the flow rate. Could you suppose each container has the same air flow?
  3. Galbi

    Water evaporation by negative pressure and 0% of RH

    Greetings! I'm trying to evaporate water in some samples. I'm trying 3 methods. Baking samples with 100°C, normal air pressure, and normal RH. Put the samples in 0% RH, 23°C, and normal air pressure. Put the samples in container of -15 psi air pressure, 23°C, and normal RH. The total amounts...
  4. Galbi

    Where can I find some small particle materials?

    Could you tell me at least the search words? It's hard for me to find the company in US. I think wood is not proper material because it is not homogeneous. I'm sorry about misplacing this thread on wrong section :)
  5. Galbi

    Where can I find some small particle materials?

    Hello, I'm looking for small particle material. Please see a picture above. The left one is box shape and the other one is sphere shape. But the diameter of the sphere is very small like something around 20~100 μm. Both are made of same material of which modulus is over 20 GPa and both are...
  6. Galbi

    Why need 4th order stiffness tensor expression?

    OK. First of all, I'm novice at Physics so this question may be weird. Above, there are 2 expressions for strain-stress relations. Let's assume that all components in the matrix are variables, not zero, not E, nor not G in the first picture. The first one is written in 2D matrix form, whereas...
  7. Galbi

    How can I calculate the inverse of a 4th order tensor?

    Dear jambaugh, It works! Thank you very much!
  8. Galbi

    How can I calculate the inverse of a 4th order tensor?

    Thank you very much. Since I'm a novice at tensor calculation, It's hard to understand what you're saying. If I have 3x3x3x3 tensors, then do the components of inversion of the matrix as seen below correspond to the components of inverse of A ? A=\left[\begin{array}{cccc} A_{1111} & A_{1112}...
  9. Galbi

    How can I calculate the inverse of a 4th order tensor?

    Homework Statement I'm looking for how to calculate inverse of the 4th order tensor. That is, [FONT=Times New Roman]A:A-1=A-1:A=I(4) If I know a fourth order tensor [FONT=Times New Roman]A, then how can I calculate [FONT=Times New Roman]A-1 ? Let's just say it is inversible. Homework...
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