# Rotating Beam Fatigue Tester

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This Demonstration plots the tension variation at the surface of a cylindrical specimen in a rotating beam fatigue test.

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Contributed by: Erik Mahieu (December 2011)

Open content licensed under CC BY-NC-SA

## Snapshots

## Details

In the elastic domain, tension is proportional to deformation, which can be expressed by , where is Young's modulus and is the elongation of the material. For a cylindrical specimen of radius , bent over a radius at rpm in the rotating beam test, this means (for the outer fibers at the surface) that .

A smaller bending sector is used to accommodate specimens with larger radius. The angular speed in the Demonstration is only indicative.

Young's modulus for steel is 195 GPa.

A working example of this test can be found here.

## Permanent Citation

"Rotating Beam Fatigue Tester"

http://demonstrations.wolfram.com/RotatingBeamFatigueTester/

Wolfram Demonstrations Project

Published: December 13 2011