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Abstract

Two integrated approaches to Lifetime Prediction are discussed. These are the Corrosion Based Design Approach (CBDA) and the Location for Analysis Matrix (LAM). These integrated approaches provide a framework for approaching the prediction and assurance of life in engineering environments. The CBDA-LAM approach provides a framework within which orderly predictions can be developed and assessed. The CBDA involves 10 steps for prediction:

• environment definition
• material definition
• mode definition
• superposition
• failure definition
• statistical definition
• accelerated testing
• prediction
• monitoring
• feedback and the fix.

The LAM provides a framework of locations, where conditions for accelerated degradation are most intense, to be compared with the modes of failure which can occur at these locations.

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