## 3 Results
### Mechanical Characterization
\begin{table}
\begin{tabular}{c|c c c c c c c c} \hline _Pin Type_ & _Cylindrical_ & \multicolumn{2}{c}{_Elliptical \#_} & \multicolumn{2}{c}{_Elliptical 90\({}^{\circ}\)_} & _Poly. Sharp_ & _Poly. Blunt_ \\ \hline _Fiber_ & 0\({}^{\circ}\) & 90\({}^{\circ}\) & 0\({}^{\circ}\) & 90\({}^{\circ}\) & 90\({}^{\circ}\) & 90\({}^{\circ}\) & 90\({}^{\circ}\) & 0\({}^{\circ}\) & 90\({}^{\circ}\) \\ _Orientation_ & 0\({}^{\circ}\) & 90\({}^{\circ}\) & 90\({}^{\circ}\) & 90\({}^{\circ}\) & 90\({}^{\circ}\) & 90\({}^{\circ}\) & 90\({}^{\circ}\) & 90\({}^{\circ}\) \\ _Max. force_ [N] & 179.3 \(\pm\) 8.7 & 239.0 \(\pm\) 8.0 & 187.5 \(\pm\) & 291.3 \(\pm\) & 319.7 \(\pm\) & 415.0 \(\pm\) & 185.3 \(\pm\) & 281.7 \(\pm\) & 232.0 \(\pm\) 7.0 & 346.7 \(\pm\) 7.5 \\  & & 15.5 & 16.0 & 19.7 & 13.6 & 23.8 & 16.7 & & \\ \hline \end{tabular}
\end{table} 
Table 5: Summary of maximum shear force results. When analyzing the foot print related joint strength, which can be seen as an indication for the efficiency of a certain pin geometry, especially with the perspective of multi-pin joints, which will be required to achieve higher total joint stabilities, a different situation shows. The baseline joint strength of the cylindrical pins is 227.0 \(\pm\) 11.1 MPa and 302.5 \(\pm\) 10.2 MPa, respectively, for fiber orientations in 0\({}^{\circ}\) and 90\({}^{\circ}\). Table 6 and Figure 7 summarize the resulting foot print related joint strength. Elliptical pins show reduced joint strength when compared to cylindrical pins. This phenomenon is most pronounced for elliptical 0\({}^{\circ}\)/0\({}^{\circ}\) samples where a joint strength of only 119.4 \(\pm\) 9.9 MPa is measured, which is a decrease of 107.6 MPa or 47.4% when compared to cylindrical 0\({}^{\circ}\) samples. For elliptical 0\({}^{\circ}\)/90\({}^{\circ}\) pins, the drop in joint strength is in a similar range with 116.9 MPa or 38.6%. Elliptical pins with an orientation of 90\({}^{\circ}\)/0\({}^{\circ}\) and 90\({}^{\circ}\)/90\({}^{\circ}\) perform better but still lead to a reduction of 23.4 MPa (0\({}^{\circ}\) fiber orientation) and 38.2 MPa (90\({}^{\circ}\) fiber orientation) respectively. In contrast to elliptical pins, polygonal pins lead to either increased or decreased foot print related joint strength, depending on the pin-orientation. While pins with \"sharp\" orientation lead to a reduction in joint strength of 37.9 MPa/16.7% (0\({}^{\circ}\) fiber orientation) and 15.1 MPa/5.0% (90\({}^{\circ}\) fiber orientation), respectively, an increase by 9.7 MPa/4.3% (0\({}^{\circ}\) fiber orientation) and 51.2 MPa/16.9% can be seen for polygonal pins with a \"blunt\" pin orientation in relation to the load direction. Generally, it can be summarized that from a joint strength perspective, an elliptical pin is disadvantageous, especially when oriented in the load direction while a polygonal pin can be beneficial when oriented so that the blunt side introduces the load into the CFRT component but is disadvantageous when the sharp edge is oriented towards the interfacing surface. When comparing the joint strength in relation of the projection area of the pin geometries in the direction of the testing load, it shows that, especially with fiber orientations of 0\({}^{\circ}\), the measured values are in a comparable range between 87.0-103 MPa (compare Figure 8 and Table 7). This can be explained with the dominant failure behavior of these