Under what conditions would negative buckling (B^2) be possible?
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May 20, 2016 #2 QuantumPion Science Advisor Gold Member 902 42 Never. Buckling is a function of physical parameters (sphere radius, reaction cross-sections, diffusion coefficient), none of which can ever be negative.
Never. Buckling is a function of physical parameters (sphere radius, reaction cross-sections, diffusion coefficient), none of which can ever be negative.
May 20, 2016 #3 Nidum Science Advisor Gold Member 2,990 848 https://forums.autodesk.com/t5/robo...icients-in-buckling-analysis/m-p/3128634#M573
May 21, 2016 #4 Astronuc Staff Emeritus Science Advisor 19,034 2,419 Nidum said: https://forums.autodesk.com/t5/robo...icients-in-buckling-analysis/m-p/3128634#M573 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
Nidum said: https://forums.autodesk.com/t5/robo...icients-in-buckling-analysis/m-p/3128634#M573 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.