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 this specific case, the calibration results in a value of �� � 4.9 ∗√ 1000 √ � � �� � �

Fig. 9. Iterative approach for the calibration procedure of the Fracture Toughness �� .

4.3. Numerical previsions

The results of the prediction in terms of fracture load of all additively manufactured PLA v-notched specimens using the averaged strain energy density criteria (ASED) and equivalent material concept (EMC) are reported in Table 4.

Table 4. Maximum Force predicted using ASED criteria combined with the EMC for each set of notch specimens

Set id

1

2

3

4

5

6

7

8

9

Predicted Force [N]

2167

2219

2392

2676

2726

3365

3146

3178

3366

As expected, specimens with a smaller notch radius break at lower loads than those with a larger notch radius, given the same cross-sectional area. Therefore, we can initially assert that the model used is able to consider the influence of the notch and its radius.

5. Comparison and Discussion The critical loads measured experimentally from tests carried out on V-notched samples were compared with numerical predictions based on the ASED criterion with an Equivalent Material approach. The graph in Fig.10 summarizes, in a comparison, the numerical and experimental results.