Application of the Crack Layer Theory to Modeling Stress Corrosion Cracking in High Pressure Gas Pipe

摘要

Stress corrosion cracking (SCC) is a well-known phenomenon of brittle cracking driven by a combination of mechanical stresses and chemically aggressive environment. It has been observed in many different material-environment systems. As shown in Fig. 1, SCC may take place in any materials. However, an electro-chemical path of SCC may be specific for each combination of material and aggressive environment.. The deterministic and statistical laws of Nature are operational in the complex phenomena of SCC colony evolution from the initiation to the ultimate failure. The individual crack growth, many crack interaction and many crack (cluster) instability leading to the ultimate fracture are in a large extend the deterministic phenomena commonly addressed by Fracture Mechanics combined with thermodynamics of irreversible processes. Statistical laws are primarily in control of the time of individual crack initiation and the location of each individual crack initiation site. In addition, a "chance" contributes to determination of the configuration of multi crack clusters as well as the entire colony.