PSI - Issue 33

660 Julio A. Ruiz Vilchez et al. / Procedia Structural Integrity 33 (2021) 658–664 Author name / Structural Integrity Procedia 00 (2019) 000–000 3 modal analysis to obtain the dimensions of testing specimen, which are close to the excitation frequency; whereas in Figure 2 are shown the dimensions of the hourglass shape specimen fulfilling the resonance condition.

Fig. 1. Numerical modal analysis to obtain the natural frequency of oscillation of testing specimen, maraging 300.

Fig. 2. Shape and dimensions for the hourglass shape testing specimens maraging 300, obtained by numerical simulation. After the dimensions of testing specimen were determined and corroborated to work under ultrasonic fatigue, the machining process was implemented to obtain the set of testing specimens, as shown in Figure 3.

Fig. 3. Machining of maraging testing specimens (a), and specimen with the attached bolt (b)