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Scale Factor for Stress Computations

Theory

You may optionally specify a scale factor to be used to transform stresses in the Flexcom units to units consistent with the S-N curve data. For Imperial units, a value of 6.9444E-06 would be typical to transform lb/ft2 to ksi. For SI units, a value of 1.E-06 would be typical to transform N/m2 to MPa.

In some cases LifeTime is in a position to decide the appropriate value to use, in which case it is not necessary to explicitly specify a scale factor. Specifically, LifeTime retrieves the gravitational constant and uses it to determine if you used Imperial or SI units in your data. Specifically, if , then LifeTime decides you employed SI units; if , then LifeTime decides you used Imperial units. In either case, LifeTime automatically determines the scale factor required to transform stresses to MPa or ksi as appropriate, so you do not need to explicitly specify a scale factor – LifeTime will determine the appropriate scale.

Relevant Keywords

•*FATIGUE DATA is used to assign fatigue data to hot spot sets.