PSI - Issue 47

G. Morettini et al. / Procedia Structural Integrity 47 (2023) 296–309 Author name / Structural Integrity Procedia 00 (2019) 000–000

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In particular, the graph shows on the y-axis the ratio between the experimental failure force and the estimated force, where a value equal to one represents an exact prediction. The thickness of the sample H is shown on the x axis, but the variability is also obtained through the use of the 3 different notch radii.

Fig. 10. Comparison between the results obtained for different notch geometries.

The comparison between the results obtained for different geometries clearly shows the accuracy of the method used, with a maximum percentage error of less than 11% (the average error in predicting the critical load was +3%, with a maximum value of +10.62%). Moreover, we can also assert that the prediction error is not influenced by the section size of the sample or by the notch radius. In fact, even though the model was calibrated in terms of K_IC using experimental forces relative to samples with thickness H=10 mm, the theoretical loads with lower errors were found to be those related to samples with width H=15 mm, confirming the robustness and wide applicability of the method used. 6. Conclusions The Averaged Strain Energy Density (ASED) criterion combined with an Equivalent Elastic Material approach allowed us to systematically study the strength of components with V-shaped notch subjected to tensile loading. We can therefore conclude that this criterion can be applied to materials that exhibit both brittle and ductile behavior, by considering, in the latter case, a fictitious linear elastic material from which it is possible to evaluate the theoretical critical load that leads to the brittle fracture of the component. The results confirmed that this approach allows predicting failure loads with errors well below ±20%, which is the typical reference limit for such applications. The average error in predicting the critical load was +3%, with a maximum value of +10.62%. The model used takes into account the influence of the notch and its radius, showing increasing critical loads with increasing radius, for equal section areas. Finally, the use of the ASED criterion combined with the concept of Equivalent Material for evaluating the load capacity of notched components proved to be simple and practical, leaving open the possibility for further studies in the case of cyclic loading or more complex static loading

conditions. References

Abdullah, Z., Ting, H.Y., Ali, M.A.M., Fauadi, M.H.F.M., Kasim, M.S., Hambali, A., et al. 2018. The Effect of Layer Thickness and Raster Angles on Tensile Strength and Flexural Strength for Fused Deposition Modeling (FDM) Parts. J Adv Manuf Technol 12, 147–58.