<p>Stress corrosion is a critical issue that leads to high costs in lost equipment and maintenance affecting operation and safety of aircraft platforms. Most aerospace structural components use the aluminum alloys 7xxx series, which contain Al, Cu, Zn, and Mg, due to the combined advantage of high-strength and lightweight. However, such alloys, specifically AL7075-T651, are susceptible to stress corrosion cracking (SCC) when exposed to both mechanical stresses and corrosive environments. SCC gives rise to a major technological challenge affecting aerospace systems as it leads to degradation of mechanical properties. In addition, such type of corrosion presents an important yet complex modeling challenge due to the synergistic action of sustained tensile stresses and aggressive environment. In light of this, we investigate the interplay of mechanical loading and electrochemistry on the stress corrosion of aluminum alloys via finite element (FE) model. The model includes a Multiphysics coupling technique through which the kinetics of corrosion along a preformed corrosion pit can be examined in the presence of elastic and plastic deformation modes. The presented model provides useful information towards the transitioning from corrosion pit to crack via tracking localized corrosion and stress distribution and hence can serve as a guide for range of operation of materials before failure.</p>

Computational Model of Mechano-Electrochemical Effect of Aluminum Alloys Corrosion

Paper Proceedings: https://asmedigitalcollection.asme.org/GT/GT2021/volume/84898

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