PSI - Issue 77

L.P. Borrego et al. / Procedia Structural Integrity 77 (2026) 681–687

685

(a)

Fig. 4. (a) Fatigue tests device and (b) NP EN ISO 4210-8:2019 standard (2019) proposal.

This standard recommends testing the crank arm at an angle of 30◦ or 45◦, with the load applied at 65 mm from the longitudinal plane of the crank arm, as can be observed in Figure 4a and 4b. This device was attached to a servo electric testing machine, model Instron ElectroPuls E10000. The fatigue tests were performed at room temperature under constant amplitude, at a stress ratio R=0, with sinusoidal load waves, and a cyclic frequency of 5 Hz. The objective of the fatigue tests was to comply with the recommendations of the NP EN ISO 4210-8:2019 standard (2019) for a leisure bicycle, specifying a fatigue life of 100,000 cycles with 1300 N of maximum load. 3. Results and discussion The microstructure of the as-built (AB) cranksets is presented in Fig. 5(a), showing supersaturated Si cellular dendritic microstructure, where aluminum is surrounded by a fibrous network of silicon, as verified in a previous study of the authors (Fernandes et al. 2022).