Standard Derating Curves

Windchill Risk and Reliability Desktop Help > Windchill Prediction > Prediction Support Files > Prediction Derating Files > Derating Data Pane > Standard Derating Curves

When using a standard derating curve for derating analysis, you enter nominal and worst case values for the parameters described in the following table in the Derating Data pane. As you enter or change values, these curves are updated in the graph that is shown. This graph plots component stress ratio over temperature. All temperatures are in degrees C.

Parameter	Type	Description
Stress ratio at 0 C	Real	The stress ratio at 0 degrees C. The value entered must be between 0 and 1.
Knee temperature	Real (Degrees C)	The temperature at which derating begins.
Maximum temperature	Real (Degrees C)	The temperature at which the stress ratio is 0.
Calculate maximum derated temperature per AS-4613 [Part Category] Derating Curve	Checkbox	When selected, the maximum temperature for the curve is calculated based on the stress ratio, knee temperature, and maximum temperature specified for the part according to the AS-4613 derating standard. When this checkbox cleared, the derating curve is based on the values entered for the above parameters. This parameter is available only for some part types.

If Calculate maximum derated temperature per AS-4613 [Part Category] Derating Curve is selected, for Maximum temperature, the same value must be entered for Nominal and Worst case. The maximum derated temperature is calculated based on the stress ratio at 0 degreesC, the knee temperature, and the maximum temperature.