Table of fatigue strengths for different steels

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The fatigue strength figures for steels, such as S235, represent mean stress values followed by stress amplitude. For example, the notation 0±160 indicates a mean stress of 0 with a stress amplitude of 160. Similarly, 130±130 signifies a mean stress of 130 and an amplitude of 130. Understanding these values is crucial for interpreting Smith diagrams and fatigue analysis. This knowledge aids in assessing material performance under cyclic loading conditions.
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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.
 
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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.
 

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