莲藕屈服强度和抗压强度的测定与分析
Determination and analysis on the yield strength and compressive strength of lotus roots

为探讨莲藕在压缩过程中的受力情况和不同藕节在不同的加载速率下抗压强度的变化规律，采用质构仪对鄂莲3537的不同藕节进行压缩试验,分析在不同的压缩速率下藕节间的压力-位移曲线，并得到对应的屈服极限和破坏极限。压缩试验测定的结果表明: 各藕节的屈服极限和破坏极限都随着压缩速率的增加而增加; 相同压缩速率下，3种藕节屈服极限的大小依次是第3节最大、第2节次之、第1节最小，不同藕节的破坏极限的大小依次是第2节最大、第3节次之、第1节最小。对屈服极限和破坏极限进行可重复双因素方差分析的结果表明： 压缩速率和不同藕节对莲藕表面的屈服极限和破坏极限有显著影响，但两者的交互作用对莲藕表面的屈服极限和破坏极限无显著影响。
In order to analyze the loading variation of lotus roots during the process of being compressed and the variation rules of compressive strength of different lotus rhizome nodes under different loading rates，different lotus rhizome nodes of Elian 3537 were selected as the research objects. The pressure displacement curves of different lotus rhizome nodes under different compressive rates were obtained from compression tests by using the texture analyzer, and the corresponding yield limit and failure limit were obtained,too. The result showed that the yield limit and failure limit increased with the rise of the compressive rates. When compressing rate was the same, the 3rd of the lotus rhizome nodes could sustain the maximum yield limit, followed by the 2nd, and the the 1st the minimum. As for the failure limit of the lotus rhizome nodes, the 2nd has the maximum one, followed by the 3rd, and the 1st successively. Two-factor variance analysis with duplication was used to analyze the yield limit and the failure limit, the results showed that both the compression rate and the lotus rhizome nodes had significant effect on the compressive strength of the lotus root surface. Meanwhile, the interaction between them had no significant effect on the compressive strength of lotus root surface.