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  • Southwell plot

    Southwell plot


    • The Southwell plot is a graphical method of determining experimentally a structure's critical load, without needing to subject the structure to near-critical loads. The technique can be used for nondestructive testing of any structural components that may fail by buckling.

      Consider a simply supported beam under a compressive load P. The differential equation of equilibrium is

      ,

      where vo is the initial deflection, and the boundary conditions are



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