Affiliations: Ternopil Ivan Pul'uj State Technical University, Ternopil, Ukraine
Note: [] Corresponding author: P. Maruschak, Ternopil Ivan Pul'uj State Technical University, Ternopil 46001, Ukraine. E-mail: maruschak.tu.edu@gmail.com.
Abstract: Fatigue crack growth characterization requires non-homogeneous strain field measurements, the use of specific techniques is necessary. In this paper, the efficiency of the automated grid method for measuring in-plane displacements in the presence of high strain gradient is discussed. Vectors fields of displacement and strain gradient near crack tip have been studied: macrostrain localization, mesostrain concentration at a crack tip in a 25Kh1M1F steel, and micromechanisms of fracture on a crack front.
Keywords: Deformation, coordinate grid, displacement field, local strains, mesolevel
