Abstract
The effect of the stress ratio on the threshold value for fatigue crack growth was investigated over a wide range of mean stresses ( − 10 < R < + 0.8) for pure Cu, the age-hardened alloy Al-2024 and the mechanically alloyed pm Al-alloy IN-905XL. In particular the influence of the compressive portion of the loading cycle on the closure behavior was studied. The experimental results indicate that depending on the material differing compressive stresses have to be applied to achieve a complete closure of the cracks. These compressive stresses must not be neglected when threshold values are computed. On the other hand, the results support the assumption that the effective threshold value is not affected by mean stress and is characteristic for the materials tested. To reveal more clearly the relation between mean stresses and the threshold values we propose to present the data ( K max ( K min ( K open and ( K closed ) in a modified Smith diagram, i.e. a plot of the K- values vs ( K mean
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