PSI - Issue 43

Kamila Kozáková et al. / Procedia Structural Integrity 43 (2023) 178–183 Kamila Koza´kova´ / Structural Integrity Procedia 00 (2023) 000–000

180

3

notched smooth

smooth notched

Determination of averaging distance

averaging distance

Experimental data

Numerical analysis

Predictions

Fig. 1. Process of lifetime predictions

varied depending on the notch radius r (see Tab. 1 and Fig. 2). Fatigue tests were performed on specimens with notch radii r = 0 . 1; 0 . 2; 0 . 8; 3 mm. Fully reversed push-pull loading was applied (stress ratio R = − 1). The fatigue data were approximated using Wo¨hler curves (see Fig. 3). Axial stress distributions were obtained using finite element models (see Fig. 4).

Fig. 2. Parameters of smooth and notched specimens

Table 1. The lengths of notched specimens notch radius r [mm] the length of notched specimen L [mm]

0.1

0.2

0.8

3.0

78.1

78.0

77.6

76.7

Fig. 3. Experimental data AW 7075

Fig. 4. Axial stress distributions