Issue34

K. Tanaka et alii, Frattura ed Integrità Strutturale, 34 (2015) 309-317; DOI: 10.3221/IGF-ESIS.34.33 314 Figure 5 : Change of crack-tip radius under loading. Figure 6 : Relation between crack propagation rate and crack-tip opening parameter. Figure 4 : Crack propagation rate correlated to ranges of stress intensity factor and energy release rate. (b) d a /d N vs  G I , (a) d a /d N vs  K I .