Natural cases of dealloying or stress-corrosion cracking in copper alloys normally occur in oxygenated solutions, where the cathodic reactant is O2 or Cu2+. Within cavities or under deposits, the local environment is enriched in cuprous ions (e.g. CuCl2-, Cu (NH3)2+) and the potential is close to the Cu/Cu+ equilibrium. Such conditions can be simulated macroscopically by stirring powdered Cu2O ...

A method is described for the classi cation of corrosion images using texture analysis methods. Two morphologies are considered: pit formation and cracking. The analysis is done by performing a wavelet decomposition of the images, from which energy feature sets are computed. A transform that turns the wavelet features into rotation invariant ones is introduced. The classi cation is performed wi...

This work applies machine learning to holistically interrogate the influence of metallurgical factors, such as chemical composition, heat treatment, and mechanical properties, on stress corrosion cracking resistance corrosion-resistant alloys. Particularly, we explored effect nickel in reducing susceptibility boiling magnesium chloride, arguably a controversial topic since Copson’s 1959 seminal...

2014 A method is described for the classification of corrosion images using texture analysis methods. Two morphologies are considered: pit formation and cracking. The analysis is done by performing a wavelet decomposition of the images, from which energy feature sets are computed. A transform that turns the wavelet features into rotation invariant ones is introduced. The classification is perfo...

In this review, we present our recent results for atomistic mechanisms of damage nucleation and growth and dynamic fracture in silica glass. These results have been obtained with multimillion-to-billion atom, parallel, molecular dynamics simulations of (1) the interaction and coalescence of nanovoids in amorphous silica subjected to dilatational strain and (2) the nucleation, growth and healing...

The Flat Geometry Remote Eddy Current (FG RFEC) Technique has its unique advantages in aircraft non-destructive inspection (NDI) including deep penetration, high sensitivity, portability, low price, etc. The technique has recently been recognized by aircraft NDI societies. Currently FG RFEC technique is capable of detecting deeply hidden cracks and corrosion flaws. This paper will introduce the...

An assessment of newly reconstructed reinforced concrete barrier walls on a highway bridge near Montreal indicated intense transverse cracking only a few days after concreting. Subsequent inspection of other concrete bridges in urban areas confirmed that such cracking is not uncommon. Analytical models, together with field and estimated data, were used to study the magnitude and roles of the fa...

A leak is an undesirable interconnection between isolated parts of a system or between two systems and is suspected if there is any abnormal behavior of a system, such as loss of pressure, contamination of product or loss of process efficiency. A leak in a system can occur due to an unintended crack, corrosion or porosity, hole in an enveloping wall, loosening of bolts/joints and cracking of ga...

Steels are being designed with ever decreasing interstitial contents. At the same time, processing technology allows accelerated cooling without excessive distortion or microstructural gradients [1–5]. Lean steels with lower ‘carbon equivalents’ can therefore be manufactured, making fabrication relatively easy. Alloys such as these give uniform microstructures in spite of solidfication–induced ...

It is demonstrated that the removal of material or the creation or extension of cracks always reduces the total potential energy of any non-linear or linear stable elastic body under fixed load and displacement boundary conditions. A weaker statement that crack extension releases potential energy in excess of plastic dissipation is established for stable elastic-plastic bodies, with certain str...