Issue 39

S. Seitl et alii, Frattura ed Integrità Strutturale, 39 (2017) 118-128; DOI: 10.3221/IGF-ESIS.39.13 124 f COD ( E =5)= 6.0419 - 4.4767α + 77.12α 2 - 153.38α 3 + 106.59α 4 (11) f COD ( E =20)= 6.7211 - 12.764α + 111.24α 2 - 208.43α 3 + 138.35α 4 (12) f COD ( E =100)= 7.491 + 21.077α + 139.81α 2 - 248.63α 3 + 158.95α 4 (13) and for CMOD f CMOD ( E =5)= 10.54 - 10.549α + 100.94α 2 - 194.05α 3 + 132.77α 4 (14) f CMOD ( E =20)= 12.478 - 27.907α + 162.68α 2 - 285.45α 3 + 182.31α 4 (15) f CMOD ( E =100)= 15.905 - 55.717α + 245.61α 2 - 390.95α 3 + 231.39α 4 (16) Effect of 2D and 3D model solutions The results of 2D and 3D model solutions (steel E =210 GPa, concrete E =25 GPa) are shown in Figs. 9-12 (stress intensity factor, T -stress, COD and CMOD). The model of 3D model solution was prepared as ¼ of all body, the steel part was as ½ of the round bar. The example of the model after deformation is shown in Fig. 8. Figure 8 : Example of 3D finite element model after deformation. Figure 9 : Values of dimensionless B 1 factor (stress intensity factor) versus a/W , effect of elasticity modulus ratio (steel E =210 GPa).