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Equations

 * For average shear stress
 * $$\tau \scriptstyle(avg) = \frac{V}{A}$$
 * where
 * $$\tau \scriptstyle(avg)$$ is the average shear stress,
 * $$V$$ is the shear force applied to each section of the part, and
 * $$A$$ is the area of the section.
 * Average shear stress can also be defined as the total force of $$V$$ as
 * $$V=\int \tau d A $$
 * Practically, the equations only give an approximation. Stress is not often equally distributed across a part so the shear strength would need to be higher to count for the estimate along with a factor of safety.

Comparisons
There are no published standard values for shear strength like with tensile and yield strength. Instead, it is common for it to be estimated as 60% of the ultimate tensile strength. Shear strength can be measures by a torsion test where it is equal to there torsional strength.