numero25

P. Lorenzino et alii, Frattura ed Integrità Strutturale, 25 (2013) 138-144 ; DOI: 10.3221/IGF-ESIS.25.20 143 Figure 6 : Location of crack initiation point in relation to notch size for a microstructure of 9.74 mm. Figure 7 : Deformation area as a result of crack growth for cracks growing in microstructures of 0.07 and 8.22 mm. Both pictures show the strain state (calculated on the loading direction,  yy ) of the sample at the moment of the initiation of plastic collapse. It is possible to observe the effect of the grain size on the deformation area, as a result of crack growth. In the case of tests conducted with small microstructures, symmetrical deformation bands are observed on both sides of the notch. While increasing the grain size, the deformation bands are influenced by the microstructure. Figure 8 : This image shows the DIC analysis and microstructure superposition.