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What is the R Ratio value entered in the Cyclic Stresses window used for?

April 26, 2017Cyclic ratio stresses Used value window

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What is the R Ratio value entered in the Cyclic Stresses window used for?

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This R Ratio value is the ratio of Kmin/Kmax. It is only used for calculating the fatigue threshold for the NASGRO and Simple Power Law Fatigue Growth curves from the properties in the Materials Database. A lower fatigue threshold value is more conservative than a higher one. If you are not using this database to generate the Fatigue Growth curves, you do not have to enter a value in the R Ratio field.