Investigation of stress corrosion crack growth in Mg alloys using J-integral estimations

Crack growth resistance curves have been determined for the stress corrosion cracking of two magnesium alloys in which theJ-integral is plotted against crack extension. As determined in this way, the resistance to crack growth initially falls with decreasing applied displacement rate but rises again at the slower rates. The effect is in line with previous results obtained on plain specimens and is thought to be due to increasing passivation at the slower testing rates. The results are discussed in terms of the displacement and displacement rate occurring at the tip of the moving crack. Formerly with The University of Newcastle upon Tyne