Huber's equation

Huber's equation, first derived by a Polish engineer Tytus Maksymilian Huber, is a basic formula in elastic material 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:

$\sigma _{red}={\sqrt {({\sigma }^{2})+3({\tau }^{2})}}$

where $\sigma$ is the tensile stress, and $\tau$ is the shear stress, measured in newtons per square meter (N/m², also called pascals, Pa), while $\sigma _{red}$—called a reduced tension—is the resultant tension of the material.

Finds application in calculating the span width of the bridges, their beam cross-sections, etc.

See also

• Yield surface
• Stress–energy tensor
• Tensile stress
• von Mises yield criterion