PSI - Issue 51

Tereza Juhászová et al. / Procedia Structural Integrity 51 (2023) 213–218 Juhaszova et al./ Structural Integrity Procedia 00 (2022) 000–000

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Fig. 2. Numerical model from FEM environment with detail of the crack vicinity.

2. Results The results of CMOD measured by experimental testing was postprocessed using relations to K I and to crack length obtained by numerical modelling. Therefore, all parameters were evaluated to determine crack growth rate vs. stress intensity factor range graphical plot in double logarithmic scale, example of which is visible in Fig.3 (a). Linear part of this relation was extracted and fitted by power function, which in logarithmic scale results to linear dependence, see 3 (b). As Paris law describes this dependence in equation (1), material parameters m and C were easily determined for each specimen. Same method was used for every specimen, results of which are plotted in Fig. 4. Numerical values of constants are summarized in Table 2.

(a) (b) Fig. 3 Dependency of crack growth rate on stress intensity factor range (a) and linear part of the dependency (b).