Wednesday 11 April 2012

What is stiffness and why do we need it in FEA?


Stiffness ‘K’ is defined as Force/length. Physical interpretation-Stiffness is equal to force required to produce unit displacement. Stiffness depends on geometry as well as material properties.

Consider 3 rods of exactly same geometrical dimensions-Cast iron, Mild Steel, Aluminium. If we measure force required to produce 1 mm displacement then Cast iron would require maximum followed by steel and Aluminium respectively KCI>KMS>K Al

Now consider 3 different c/s rods of same material. Again force required to produce unit deformation will be different. Hence stiffness depends on geometry as well as material.

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