Abstract
A computerized digital speckle-interferometry (SPI) system has been set up to determine the in-plane distribution of displacement and strain at crack tip of CF specimens. The effect of corrosion factors on plastic deformation at crack tip in CF process has been examined by comparing the near-tip strain fields of steel A537 before and after H charging, and of pure copper before and after applying an anodic current in 3.5% NaCl. The results showed that the classic finite element mathematical models were not suitable to describe the near-tip deformation under the experimental conditions. Hydrogen charging decreased the crack tip plasticity for steel A537, and the anodic dissolution enhanced the near-tip deformation of pure Cu specimen.