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'''Huber's equation''', first derived by a Polish engineer [[Tytus Maksymilian Huber]], is a basic formula in elastic material [[tension (physics)|tension]] calculations, an equivalent of the [[equation of state]], but applying to solids. In most simple expression and commonly in use it looks like this:

<math>
\sigma_{red}=\sqrt{({\sigma}^2) + 3({\tau}^2)}
</math>

where <math>\sigma</math> is the [[tensile stress]], and <math>\tau</math> is the [[shear stress]], measured in newtons per square meter (N/m², also called [[pascal (unit)|pascal]]s, Pa), while <math>\sigma_{red}</math> - called a reduced tension, is the resultant tension of the material.

Very useful in calculating the span width of the bridges like [[Golden Gate Bridge]] or [[Verrazano-Narrows Bridge]], their beam cross-sections, etc.

==See also==
* [[Yield surface]]
* [[Stress energy tensor]]
* [[Tensile stress]]

{{classicalmechanics-stub}}

[[Category:Physical quantities]]
[[Category:Structural analysis]]