PSI - Issue 47

Zoltán Bézi et al. / Procedia Structural Integrity 47 (2023) 646–653 Author name / Structural Integrity Procedia 00 (2019) 000 – 000

650

5

Parameter

Value range

1.5

1 q 2 q

1

0.0008 0.1591 0.4035 0.1803

0 f c f

f f

n 

0.05

n S

0.0099

n f

Fig. 4. Verification of the GTN parameters.

3. Application of GTN parameters to standard CT specimen After the GTN parameters were determined, they were applied to standard CT specimens of normal size (1TCT). The specimens were prepared with two pre-crack sizes (P1: 23.8mm and P2: 24.2mm). The finite element mesh is illustrated in Figure 5 where the boundary conditions are also shown (symmetries and load). The pin was interpreted as a rigid body and was meshed with a 100 µm element size in the crack region.

Fig. 5. 1T-CT FEM model with the boundary conditions.

The GTN parameters were applied to both specimens and both the LLD-F curves and crack propagation were compared with the test results, as illustrated in Figure 6. The results showed good agreement.

Fig. 6. Comparisons of the results (a) P1 specimen with 0 a 23.8mm = (b) P2 specimen with 0 a 24.2mm = (c) crack propagation.