PSI - Issue 56

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Kevin Moj et al. / Procedia Structural Integrity 56 (2024) 120–130 Author name / Structural Integrity Procedia 00 (2019) 000–000

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Table 2. The minimum number of cells for selected examples. The type of cell

Minimum number of cells

Stability criterion

BCC (20%.50%)

5 2 4 3

5 3 3 4

change in effective Young's modulus

Diamond (20%.50%) Kelvin (25%.50%) Fluorite (25%.50%)

effective Young's modulus

change in effective Young's modulus

effective Young's modulus

3.2. Geometric and porosity analysis using Computer Tomography The use of computed tomography makes it possible to evaluate the actual relative density. porosity. average defect size and average dimensional deviation from the designed model. Using a three-dimensional representation of real objects. the relative density was determined (Karme et al. 2015). The data on this is illustrated in Table 3. where the other test results are also summarized. Based on the collected data. it can be seen that in all cases where the cell size in the cellular structure was 2 mm and the relative density was designed at 25%. there were slight positive differences. Nevertheless. based on the data obtained. it can be concluded that good compliance with the designed relative density was achieved. The highest porosity was observed for a cellular structure consisting of a 2 mm Fluorite cell and a relative density of 25%. The maximum porosity value is 0.22%.

Fig. 5 Analysis of dimensional deviations.

Fig. 6. Analysis of the volume of defects.