Structural integrity of safety components during service is strictly related to different factors such as: 1) performance of the adopted NDT method; 2) crack growth behaviour of the material; 3) load history during service. Considering mechanical components subjected to fatigue, it is licit to expect crack nucleation and propagation in the most stressed points and where defects are introduced due to technological processes or aggressive environmental conditions. The “Damage Tolerant” approach requests to inspect periodically, by means of NDT, the component during service so to detect such cracks and defects before they become dangerous. Up until now, the performance of NDT have been quantified by the Probability of Detection (“POD”) curves in terms of a characteristic linear dimension of defects (depth, diameter, etc.). The present paper, on the basis of recent results published by the authors, proposes a novel and more effective approach to the derivation and characterisation of POD curves in terms of reflecting areas. Such approach seems to provide interesting advantages in respsct to the traditional one.

NDT RELIABILTY AND INSPECTION INTERVALS ASSESSMENT FOR A SAFE SERVICE OF RAILWAY AXLES

CARBONI, MICHELE;BERETTA, STEFANO
2010-01-01

Abstract

Structural integrity of safety components during service is strictly related to different factors such as: 1) performance of the adopted NDT method; 2) crack growth behaviour of the material; 3) load history during service. Considering mechanical components subjected to fatigue, it is licit to expect crack nucleation and propagation in the most stressed points and where defects are introduced due to technological processes or aggressive environmental conditions. The “Damage Tolerant” approach requests to inspect periodically, by means of NDT, the component during service so to detect such cracks and defects before they become dangerous. Up until now, the performance of NDT have been quantified by the Probability of Detection (“POD”) curves in terms of a characteristic linear dimension of defects (depth, diameter, etc.). The present paper, on the basis of recent results published by the authors, proposes a novel and more effective approach to the derivation and characterisation of POD curves in terms of reflecting areas. Such approach seems to provide interesting advantages in respsct to the traditional one.
2010
Proceedings 16th International Wheelset Congress
ultrasonic testing, railway axles, fatigue cracks, artificial defects, POD curves
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11311/575360
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