Environmental Definition

"Defining the environment" is the most important step in predicting performance. It is also the step that is given least attention and for which there is little understanding by the technical community.

An approach to defining environments is illustrated in the "dot diagram" of Figure 2. Each of the numbers in brackets, [], identifies an explicit action that needs to be considered in the step of environmental definition. The end point of the process in Figure 2 is an input to a Location for Analysis, LAi in Figure 4. (LAi is used to indicate that there may be, and likely are, several, "i," "Locations for Analysis"). Before elaborating on the definition of environment there are two items of background to consider:

Lifetime Prediction, Roger W. Staehle, Adjunct Professor, Department of Chemical Engineering and Materials Science, University of Minnesota, Staehle Consulting Co.