PSI - Issue 54

R.F. Fernandes et al. / Procedia Structural Integrity 54 (2024) 300–306 Author name / Structural Integrity Procedia 00 (2019) 000 – 000

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To correlate the SWT parameter calculated based on the experimental results and the predicted number of cycles, the following equation was used: = × , (2) where, ’ is the predicted number of cycles to failure, and C and b are parameters of the linear regression for the unnotched specimens. Figure 4 shows the correlation between the experimental number of cycles with the predicted ones for both series, as well as for both semicircular (D) and hole (O) notches.

a)

b)

Fig. 4. Predicted life vs Experimental life for each condition: a) As-built, and b) Stress Relief.

To evaluate the accuracy of this method, two confident bands were plotted (k=2 and k=0.5). This method demonstrates a good agreement between the predicted life and experimental results. Figure 4a) presents the results for the AB series, for both studied notches. In the case of the as built series and the semicircular notch (D), 78% of the predicted values are within the confident band, while the hole notch (O) has 100% of the predicted values within the confidence band. Considering the SR series, both notches (D and O) have 90% of the predicted values within the confidence band. Si, this modified version of SWT parameter shows a good performance to predict the fatigue life of notched AlSi10Mg specimens. 4. Conclusions This work has been centered on the experimental investigation of the fatigue behavior of both unnotched and notched specimens manufactured using the AlSi10Mg alloy processed by LPBF. The primary goal was to comprehend the effect of different notches on the fatigue behavior under constant amplitude loading. Based on the outcomes of this study, the following conclusions can be drawn: • The application of the heat treatment induced a decrease in the hardness and consequently a reduction in the monotonic tensile properties, while increasing ductility; • The stress relief (SR) series exhibited superior fatigue performance with increased fatigue strength;