Issue 49

M. Hadj Miloud et alii, Frattura ed Integrità Strutturale, 49 (2019) 630-642; DOI: 10.3221/IGF-ESIS.49.57 637 Figure 5 : Numerical/experimental comparison of the Load vs. Diametric Reduction curve in the case of the coupled identification of GTN model and Voce hardening law. Initial parameters Interval of variation Identified parameters 0  (MPa) 420.0 300.0 to 460.0 339.8  15.0 5.0 to 70.0 9.38 S  (MPa) 800.0 500.0 to 900.0 659 L  0.015 0.01 to 0.05 0.021 Fixed f F 0.1 0.1 0.1 f C 0.01 0.005 to 0.08 0.048 f N 0.004 0.0005 to 0.007 0.0065 Cost function 32.32% ----------------------- 4.01% Table 2. Identified GTN and Voce parameters. Figure 6 : Numerical/experimental comparison of the Load vs. Diametric Reduction curve in the case of the coupled identification of GTN model and Ludwick hardening law. 0 5 10 15 20 25 0 0,5 1 1,5 2 Load (kN) Diametric Reduction (mm) Experimental data[9] GTN Identification with Voce law 0 5 10 15 20 25 0 0,5 1 1,5 2 Load (kN) Diametric Reduction (mm) Experimental data[9] GTN Identification with Ludwick law P P