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  2. Johnson's parabolic formula - Wikipedia

    en.wikipedia.org/wiki/Johnson's_parabolic_formula

    [4] The slenderness ratio is an indicator of the specimen's resistance to bending and buckling, due to its length and cross section. If the slenderness ratio is less than the critical slenderness ratio, the column is considered to be a short column. In these cases, the Johnson parabola is more applicable than the Euler formula. [5]

  3. Euler's critical load - Wikipedia

    en.wikipedia.org/wiki/Euler's_critical_load

    Euler's critical load or Euler's buckling load is the compressive load at which a slender column will suddenly bend or buckle. It is given by the formula: [1] = where , Euler's critical load (longitudinal compression load on column),

  4. Specific modulus - Wikipedia

    en.wikipedia.org/wiki/Specific_modulus

    Examining the density formula, we see that the mass of a beam depends directly on the density. Thus if a beam's cross-sectional dimensions are constrained and weight reduction is the primary goal, performance of the beam will depend on Young's modulus divided by density .

  5. Viscoplasticity - Wikipedia

    en.wikipedia.org/wiki/Viscoplasticity

    the Johnson–Cook model; the Steinberg–Cochran–Guinan–Lund model. the Zerilli–Armstrong model. the Mechanical threshold stress model. the Preston–Tonks–Wallace model. The Johnson–Cook (JC) model [24] is purely empirical and is the most widely used of the five. However, this model exhibits an unrealistically small strain-rate ...

  6. Torsion constant - Wikipedia

    en.wikipedia.org/wiki/Torsion_constant

    In 1820, the French engineer A. Duleau derived analytically that the torsion constant of a beam is identical to the second moment of area normal to the section J zz, which has an exact analytic equation, by assuming that a plane section before twisting remains planar after twisting, and a diameter remains a straight line.

  7. Geometric and material buckling - Wikipedia

    en.wikipedia.org/.../Geometric_and_Material_Buckling

    Geometric buckling is a measure of neutron leakage and material buckling is a measure of the difference between neutron production and neutron absorption. [1] When nuclear fission occurs inside of a nuclear reactor, neutrons are produced. [1] These neutrons then, to state it simply, either react with the fuel in the reactor or escape from the ...

  8. '7 Little Johnstons' Liz Breaks Silence About Breakup With ...

    www.aol.com/lifestyle/7-little-johnstons-liz...

    Ahead of 7 Little Johnstons Season 14, TLC viewers might want to brace themselves for an emotional ride. That's because Liz Johnston has officially broken her silence about splitting from longtime ...

  9. Southwell plot - Wikipedia

    en.wikipedia.org/wiki/Southwell_plot

    Initially created for stability problems in column buckling, the Southwell method has also been used to determine critical loads in frame and plate buckling experiments. The method is particularly useful for field tests of structures that are likely to be damaged by applying loads near the critical load and beyond, such as reinforced concrete ...