A rationale for the reliability assessment of high integrity mechanical systems

Abstract

The purchaser of a high integrity mechanical system requires assurance that the manufacturer's claims will be met. Very elaborate, time-consuming and expensive studies could be envisaged to study the stressing, fatigue, wear and other failure mechanisms of every element and justify the design. A classical theory of stress-strength interference, whilst appearing useful in predicting failures, is seen to be less appropriate to the high integrity case. The dilemma that failures are impossible is contested. Finally, it is proposed that a practical, meaningful and economic analysis can be made using a blend of historical data, conventional reliability techniques such as fault tree analysis, physical inspection, experience and common sense.