Pitting Stochastic Study in Airframe Aluminium Alloy using Non-linear Ultrasonic

Palit Sagar, S and Metya, Avijit Kumar and Dey, Swapna and Chattoraj, I (2008) Pitting Stochastic Study in Airframe Aluminium Alloy using Non-linear Ultrasonic. In: 17th World Conference on Nondestructive Testing, 25-28 Oct., 2008, Shanghai, China. (Submitted)

PDF (Proceedings of 17th World Conference) - Accepted Version


Pitting corrosion is considered to be one of the principal degradation mechanisms for high-strength aluminum alloys. The aircraft airframe has been the most demanding application for aluminum alloys. The combined effects of corrosion and cyclic loading have been shown to produce cracks from corrosion pits and pits have frequently been the source of cracks on aircraft components operating in fleets. Once the pit or group of pits form, the rate of pit growth is dependent mainly on the material, environmental conditions and type and state of stress. Therefore, to estimate the total corrosion fatigue life of a component, it is of great importance to develop realistic models to establish the component life in these situations and to formulate methods by which designers and operators know likely sources of pitting early in the design and fleet operation. There are certain gaps in knowledge with regards to life prediction for pitting initiated fatigue. The need is to gauge the extent of pitting damage of a component or material non-destructively and predict the remaining life through superimposition of the pertinent operational, environmental and material parameters. However, a foolproof non-destructive means to characterize and three-dimensionally map pits is not available. The pitting phenomenon has to be analyzed statistically and the kinetics of pitting assessed through a change in the statistical distribution parameter of pits rather than deterministic equations relating pit dimensions to time. In this work we have applied high frequency ultrasonic and non-linear ultrasonic to assess the damage due to pitting and attempt has been made to establish correlations between this non-destructive tools and pit stochastic.

Item Type:Conference or Workshop Item (Paper)
Official URL/DOI:http://eprints.nmlindia.org/5646
Uncontrolled Keywords:Pitting, Al-alloy, ultrasonic, non-linear ultrasonic, pit stochastic
Divisions:Material Science and Technology
ID Code:5646
Deposited By:Mr. Avijit Kr. Metya
Deposited On:02 Jul 2012 16:31
Last Modified:17 Sep 2012 15:31
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