## 3 Results
### Mechanical Testing
The stress increase in the area of plastic deformation had a linear course. It can be seen from the diagram in Figure 11f that approximately 30% relative compression of the sample was required to break the sample. Crushing of pore layers can be seen on some samples. Results of mechanical testing of six types of prepared samples are listed in Table 6.  
The yield strength and the area of elastic deformation decrease as the pore size increases. Samples with pore size of 600 \(\upmu\)m had the lowest values and samples with pore size of 200 \(\upmu\)m had the highest values of yield strength. Comparison of yield strength of each sample type with the pore size of the sample is shown in Figure 12.  
A comparison of the maximum tensile strength of the 6 types of samples considering the pore size is shown graphically in Figure 13. The values of the maximum tensile strength depend not only on the size of the pores but also on the type of structure of the test specimens. The highest value of the maximum tensile strength was observed for sample type 4, with a pore size of 200 \(\upmu\)m (Figure 13). The modulus of elasticity decreases with the pore size increasing. For samples with a pore size of 600 \(\upmu\)m, the lowest values of the modulus of elasticity were evaluated. In contrast, for samples with a pore size of 200 \(\upmu\)m, the modulus of elasticity exhibited the highest value. Figure 14 compares the approximate values of the modulus of elasticity of the tested samples. These values show the resistance of the samples to deformation. \begin{table}
\begin{tabular}{c c c c c c} \hline \hline
**Sample** & **Max.** & **Yield Strength** & **Tensile Strength** & **Modulus of Elasticity** & **Energy** \\
**Type** & **Force (kN)** & **(MPa)** & **(MPa)** & **(GPa)** & **Absorption (kJ/mm3)** \\ \hline
1 & 82.08 \(\pm\) 4.49 & 775.88 \(\pm\) 36.33 & 1179.99 \(\pm\) 64.49 & 10.40 \(\pm\) 0.84 & 22 032.80 \(\pm\) 2790.74 \\
2 & 23.12 \(\pm\) 1.16 & 363.65 \(\pm\) 8.99 & 481.67 \(\pm\) 24.25 & 6.80 \(\pm\) 0.42 & 16 412.20 \(\pm\) 3137.35 \\
3 & 10.57 \(\pm\) 0.28 & 251.77 \(\pm\) 6.94 & 302.00 \(\pm\) 8.09 & 3.80 \(\pm\) 0.42 & 10 637.60 \(\pm\) 521.71 \\
4 & 120.70 \(\pm\) 3.07 & 1055.03 \(\pm\) 135.90 & 1631.08 \(\pm\) 41.49 & 10.50 \(\pm\) 0.58 & 37 251.00 \(\pm\) 2815.18 \\
5 & 82.78 \(\pm\) 5.08 & 525.07 \(\pm\) 44.48 & 1160.59 \(\pm\) 74.42 & 8.60 \(\pm\) 0.70 & 28 658.90 \(\pm\) 3862.16 \\
6 & 44.92 \(\pm\) 2.79 & 198.45 \(\pm\) 83.29 & 1032.64 \(\pm\) 64.18 & 4.70 \(\pm\) 1.95 & 19 042.40 \(\pm\) 1354.78 \\ \hline \hline \end{tabular}
\end{table} 
Table 6: Average values of mechanical properties of the tested samples. Figure 12: (a) Comparison of yield strength of 6 types of samples considering the pore size (b) Average values of yield strength for individual types of specimens. For a detailed and deeper understanding of mechanical properties, it is necessary to look at the resulting values of mechanical characteristics for the specific structure of the sample. In the figures, the structures are numbered 1 and 2, where:  
1--trabecular structure  
2--cubic structure  
It can be seen from Figure 15 that for the trabecular structure of the samples, the values of the yield strength were lower compared to the cubic structure. The lowest yield strength values were obtained for samples with a cubic structure, but at the same time, the highest yield strength values were achieved for these types of samples. It could be explained by the wide range of measured values for the cubic structures. Figure 14: (**a**) Comparison of values of modulus of elasticity considering the pore size. (**b**) The average values of the modulus of elasticity of tested sample types 1–6. Figure 15: Comparison of yield strength considering the structure of the sample types 1–6. The highest values of maximum tensile strength were obtained for samples with a cubic structure, and vice versa, the tensile strength was the lowest for the trabecular structures. In Figure 16, the values of tensile strength for samples 1-6 in relation to the structure are shown.