Issue 47

T. Kawabata et alii, Frattura ed Integrità Strutturale, 47 (2019) 416-424; DOI: 10.3221/IGF-ESIS.47.32 421 Figure 9 : Change of stress intensity factor assuming 2D-elastic and static. Figure 10 : Crack propagation rate versus stress intensity factor compared with previous experiments [1] D ISCUSSION he relationship between stress intensity factor and brittle crack propagation velocity in steel materials has been discussed often using experimental data. The experimental research using 4340 steel by Rosakis et al. [27] is well known. Their results showed that the crack propagation speed increases as the stress intensity factor increases, values T