Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Negative Buckling

  1. May 19, 2016 #1
    Under what conditions would negative buckling (B^2) be possible?
     
  2. jcsd
  3. May 20, 2016 #2

    QuantumPion

    User Avatar
    Science Advisor
    Gold Member

    Never. Buckling is a function of physical parameters (sphere radius, reaction cross-sections, diffusion coefficient), none of which can ever be negative.
     
  4. May 20, 2016 #3

    Nidum

    User Avatar
    Science Advisor
    Gold Member

  5. May 21, 2016 #4

    Astronuc

    User Avatar
    Staff Emeritus
    Science Advisor

    Buckling of a structure (mechanical analysis) is not the same as 'buckling' with respect to the neutron flux in a nuclear reactor.

    I believe B2 < 0 implies the system is subscritical.

    Let B2 = (νΣf - Σa)/D = (k - 1)/L2, then the buckling is negative if k < 1, or Σa > νΣf.

    Ref: http://www.nuceng.ca/br_space/2015-..._flux_shape_in_various_reactor_geometries.pdf

    Geometric buckling would not be negative.
     
    Last edited: May 21, 2016
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted