# Table of fatigue strengths for different steels

## Main Question or Discussion Point

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.

## Answers and Replies

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brewnog
Science Advisor
Gold Member
TSN79 said:
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.
Pretty much. The values will be mean stress (not tension), followed by the stress amplitude for the particular fatigue test used.