# Table of fatigue strengths for different steels

1. Jul 3, 2005

### TSN79

I'm looking at a table of fatigue strengths for different steels. I would like to know what the figures mean. For instance, for S235 under streching/pressure it says $$0\pm160$$ and $$130\pm130$$. I believe the values are supposed to be average tension pluss/minus amplitude tension, but I'm not sure. I'm hoping someone can explain this to me, and so maybe I can understand the Smith-diagrams soon as well.

2. Jul 3, 2005

### brewnog

Pretty much. The values will be mean stress (not tension), followed by the stress amplitude for the particular fatigue test used.