PSI - Issue 28

Pietro Foti et al. / Procedia Structural Integrity 28 (2020) 734–742 Pietro Foti et al./ Structural Integrity Procedia 00 (2019) 00 – 00

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Figure 5: Control volume and SED contour plot for: a) Model 2A; b) Model 2B; c) Model 2C

4. Results and Discussions The purpose of the present work is to evaluate the error in achieving the SED value for components without stress concentrator, such as sharp V-notches, considering only one numerical simulation carried out though a model with a free mesh pattern built imposing only a refinement near the notch fitting curve. For the model 1B, the reference case corresponds to the value acquired with the numerical analysis carried out with the most refined mesh pattern through the model 1A that corresponds to the conventional procedure utilised to estimate the SED value, while as regards the model 2A and 2B, the reference value corresponds to the value acquired with the numerical analysis carried out with a very refined mesh pattern through the model 2C. The Table 1 reports, for the models 1B, 2A and 2B, the mean value, , the standard deviation, , the maximum and the minimum error achieved for all the possible set of parameters listed in section 3 with changing the mesh refinement.

Table 1: SED error statistic for the models considered

Model � ⁄ μ 4

σ

Err max %

Err min %

0.29 0.05 -0.02 0.10 0.04 0.10 0.43 0.03 -0.10 -0.03 -0.07 -0.02 -0.81 0.47 -0.11 0.05 0.21 0.25

1.46 0.84 0.88 0.79 0.72 0.94 0.96 0.32 0.52 0.40 0.35 0.17 4.52 3.48 2.25 2.79 1.57 1.69

7.91 3.97 5.05 7.68 5.49 8.32 1.52 0.71 1.69 1.66 1.33 0.59

-3.70 -3.14 -4.66 -1.65 -2.08 -2.01 -3.66 -1.19 -2.39 -1.27 -1.37 -0.51 -8.17 -8.20 -6.21 -5.10 -4.91 -4.98

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10 12 16 20 10 12 16 20 10 12 16 20 4 8 4 8

1B

2A

17.56 14.26 8.07 4.81 5.68 6.05

2B