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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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Wikipedia

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