Location

La Jolla, CA

Start Date

1979 12:00 AM

Description

Life extension of high cost components until measurable damage is detected can result in marked reductions in total cycle costs. The life extension strategy for turbine disks is based upon nondestructive inspection to detect defects, usage and stress analysis to define requirements, and fracture mechanics analysis and testing to evaluate the severity of any defects under future usage. Because there are uncertainties and inaccuracies in the inspection, analysis, testing and definition of past and future usage, the selection of the optimum life extension strategy requires quantitative evaluation of the costs and risks associated with each uncertainty during life extension. This paper summarizes recent developments in the basic methodologies necessary to quantify reliability. Specific examples are described which illustrate the concepts and payoff possible as well as the relative importance of inspection, analysis, and usage uncertainties on the optimum life extension strategy.

Book Title

Proceedings of the ARPA/AFML Review of Progress in Quantitative NDE

Chapter

6. Failure Prediction and Reliability in Materials and Material Systems

Pages

150-161

Language

en

File Format

application/pdf

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Jan 1st, 12:00 AM

The Impact of Inspection and Analysis Uncertainty on Reliability Prediction and Life Extension Strategy

La Jolla, CA

Life extension of high cost components until measurable damage is detected can result in marked reductions in total cycle costs. The life extension strategy for turbine disks is based upon nondestructive inspection to detect defects, usage and stress analysis to define requirements, and fracture mechanics analysis and testing to evaluate the severity of any defects under future usage. Because there are uncertainties and inaccuracies in the inspection, analysis, testing and definition of past and future usage, the selection of the optimum life extension strategy requires quantitative evaluation of the costs and risks associated with each uncertainty during life extension. This paper summarizes recent developments in the basic methodologies necessary to quantify reliability. Specific examples are described which illustrate the concepts and payoff possible as well as the relative importance of inspection, analysis, and usage uncertainties on the optimum life extension strategy.