Open Access

ARTICLE

Evaluation of Stress Environment around Pits in Nickel Aluminum Bronze Metal under Corrosion and Cyclic Stresses

by Ramana M. Pidaparti¹, Alex C. Johnson¹

1 Department of Mechanical Engineering, Virginia Commonwealth University, 401 West Main Street, Richmond, VA 23284

Structural Durability & Health Monitoring 2013, 9(1), 87-98. https://doi.org/10.32604/sdhm.2013.009.087

Abstract

Surface damage in the form of pitting was observed in NiAl Bronze metal subjected to corrosion and cyclic stresses. In order to investigate the stresses surrounding the evolving pits due to corrosion, an image based computational study was carried out. The computational study involves developing an analysis model from the SEM images of corroded pits and then conducting stress analysis. Several computational simulations were carried out with increasing/evolving pits and the corresponding stress environment was obtained. The results obtained indicate that pit profiles (size and height) greatly affect the stress environment and the maximum stresses may vary depending on the pit profile. Overall, the results obtained illustrate that the stress environments around pit profiles are non-uniform and can attain maximum values at various locations around the pits due to non-uniformity of pit profiles in NAB metal. From these stresses, it is possible to predict where the cracks (Mode I and Mode II) or mixed mode (Mode I & II) may initiate from the pit profiles in the material.

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