# Test Trials and Analysis of Pod-Shattering Characteristics of Harvested Rapeseed Silique
## 3 Results and Analysis
### Impending Fracturing Test Results and Analyses
#### 3.2.3 Effect of Loading Speed and Silique Growth Position on Mechanical Properties of Siliques
Multiple comparisons of load loading speeds showed that all three levels of loading speeds had significant differences in the maximum cracking force, and the effects on the maximum cracking force of silique shattering were ranked as follows: medium speed (15 mm\(\cdot\)min\({}^{-1}\)) \(>\) high speed (25 mm\(\cdot\)min\({}^{-1}\)) \(>\) low speed (5 mm\(\cdot\)min\({}^{-1}\)). \begin{table}
\begin{tabular}{c c c c c c c} \hline \hline \multicolumn{2}{c}{**Silique at the Top of Plant**} & \multicolumn{2}{c}{**Silique at the Middle of Plant**} & \multicolumn{2}{c}{**Silique at the Bottom of Plant**} \\ \cline{2-7} \multicolumn{1}{c}{\begin{tabular}{c} **Average Value of** \\ **the Maximum** \\ **Cracking** \\ **Force/N** \\ \end{tabular} } & \begin{tabular}{c} **Average Value** \\ **Value of** \\ **Flexural** \\ **Strength/MPa** \\ \end{tabular} & \begin{tabular}{c} **Average Value** \\ **of Flexural** \\ **Strength/MPa** \\ \end{tabular} & \
\begin{tabular}{c} **Average Value** \\ **of Flexural** \\ **Strength/MPa** \\ \end{tabular} &
\begin{tabular}{c} **Average Value** \\ **of Flexural** \\ **Strength/MPa** \\ \end{tabular} \\ \hline Loading speed & 1.85 & 5.15 & 1.91 & 5.32 & 1.86 & 5.16 \\
15 mm\(\cdot\)min\({}^{-1}\) & 2.21 & 6.14 & 2.32 & 6.45 & 2.18 & 6.06 \\ Loading speed & 2.07 & 5.75 & 2.15 & 5.98 & 1.96 & 5.46 \\ Average value & 2.02 & 5.63 & 2.11 & 5.86 & 2.00 & 5.57 \\ \hline \hline \end{tabular}
\end{table} 
Table 10: Impending fracturing test data with different loading rate and silique growth position. \begin{table}
\begin{tabular}{c c c c c} \hline \hline \multicolumn{1}{c}{\begin{tabular}{c} **Source of Variation** \\ **Sources** \\ \end{tabular} } & \begin{tabular}{c} **Type III Sum of** \\ **Sources** \\ \end{tabular} & \begin{tabular}{c} **Degree of** \\ **Freedom** \\ \end{tabular} & \
\begin{tabular}{c} **Mean** \\ **Square** \\ \end{tabular} &
\begin{tabular}{c} **F** \\ **S Significance** \\ \end{tabular} \\ \hline Correction model & 0.891 & 8 & 0.111 & 14.001 & \textless{}0.001 \\ Intercept & 135.296 & 1 & 135.296 & 17,007.528 & \textless{}0.001 \\ Silique distribution location & 0.095 & 2 & 0.047 & 5.951 & 0.008 \\ Loading speed & 0.776 & 2 & 0.388 & 48.785 & \textless{}0.001 \\ Silique distribution location \(\times\) Loading speed & 0.019 & 4 & 0.005 & 0.610 & 0.625 \\ Error & 0.191 & 24 & 0.008 & & \\ Total & 139.453 & 33 & & & \\ Correction total & 1.082 & 32 & & & \\ \hline \hline \end{tabular}
\end{table} 
Table 11: Analysis of variance of silique position and loading speed on the maximum cracking force of siliques. The analysis of variance of the flexural strength of siliques under different loading speeds and silique growth positions is shown in Table 12.  
The model significance (\(p<0.001\)) of the flexural strength of siliques indicated that the silique distribution location (\(p=0.008<0.01\)) and the load loading speed (\(p<0.001\)) had a highly significant effect on flexural strength. Multiple comparisons of the flexural strength of siliques under different distribution positions of siliques were carried out using the SNK method. The flexural strength of siliques at the middle of the main rapeseed branch was significantly different from that of siliques in other positions, and the difference in flexural strength between siliques at the bottom and top of the main rapeseed branch was not significant. Multiple comparisons of load loading speeds were made, and it was seen that there was a significant difference between the three loading speeds on the flexural strength of the silique, with the effects on the flexural strength of the silique ranked as follows: medium speed (15 mm\(\cdot\)min\({}^{-1}\)) > high speed (25 mm\(\cdot\)min\({}^{-1}\)) > low speed (5 mm\(\cdot\)min\({}^{-1}\)).