Fatigue life estimation.

1. Apr 18, 2005

chandran

I am working on a physics problem in a project to estimate fatigue life of a component.

There is a cam rotating with an offset of 10mm rotating at an rpm of 230. The component is a cantilever fixed at one end is getting hit by this cam while it is rotating. The cam is at the other end of cantilever.

I want to simulate this using basic mechanics to estimate the fatigue life of the component. So far i have done the following

1.peak acceleration due to the component is a(sqr w) where a is the cam offset and w is the frequency of rotation of cam. Call this peak acceleration as A

2.I have calculated the static stresses(principal stress(sigma) and maximum shear stress(tau)) at the cantilever point(fixed end) due to a load of P as sigma

After that how should i proceed to check the fatigue life?

2. Apr 18, 2005

FredGarvin

First thing you can do is to take your alternating stress and compare that to what can be found in S-n diagrams for the material your beam is made out of. That I would think would be the quickest and easiest. If your material has a fatigue limit, you will find it there.