Fatigue limit of unnotched steels (related to tensile strength).
Abstract:ESDU 88008 gives data for fatigue limit, or fatigue strength at high endurance for corrosion resistant steels which do not show a limit, for 240 different alloys. For axial, bending or torsional loading the relationship between the limit and the tensile strength is shown graphically and a statistical analysis defines a mean curve and curves for 10 and 90 per cent probability of survival with 95 per cent confidence. An example calculation illustrates how alternative values of probability and confidence can be used to define the limit. For axial loading the effect of the mean stress is shown. For the data under torsion a comparison is made with the prediction obtained by applying the von Mises criterion to the fatigue limit under bending. The material specifications, heat treatments and tensile strengths are tabulated together with the appropriate values of the fatigue limits obtained from the graphical presentation.
- Austenitic Stainless Steels
- High Tensile Low Alloy Steels
- Low Tensile Low Alloy Steels
- Maraging Steels
- Precipitation Hardening Stainless Steels
|Data Item ESDU 88008
The graphs listed below are available only to subscribers.
|Mean curves for bending R = -1, axial R = -1, torsion R = -1 and axial R = 0 data.
|Specimens under bending loading, R = -1
|Specimens under axial loading, R = -1
|Distribution of data in Figure 4 about the mean line
|Specimens under torsional loading
|Mean line through torsional data compared with mean line through bending data modified by Von Mises
|Specimens under axial loading, R = 0
|Fatigue strengths of high alloy steels in bending (zero mean stress)
|Effect of mean stress on the fatigue limit of low alloy steels