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Normal Stress

Applicable units are those of quantitykind:ForcePerArea

Normal stress is defined as the stress resulting from a force acting normal to a body surface. Normal stress can be caused by several loading methods, the most common being axial tension and compression, bending, and hoop stress.

http://en.wikipedia.org/wiki/Stress_(mechanics)

http://www.iso.org/iso/catalogue_detail?csnumber=31889

$\sigma = \frac{dF_n}{dA}$, where $dF_n$ is the normal component of force and $dA$ is the area of the surface element.

$\sigma$

Normal stress is defined as the stress resulting from a force acting normal to a body surface. Normal stress can be caused by several loading methods, the most common being axial tension and compression, bending, and hoop stress.