油用牡丹茎秆穿刺力学特性试验研究

Experimental Study on Puncture Mechanical Property of Oil Peony Stem

对油用牡丹茎秆的穿刺力学特性进行研究,旨在为油用牡丹果荚的高效采收提供依据。以洛阳地区采摘的丹凤白品种的油用牡丹为研究对象,利用质构仪测定油用牡丹茎秆强度,分析茎秆穿刺力、直径、相对含水率等物理特性参数,以及茎秆纤维素、半纤维素、木质素等化学组分的含量。以穿刺力为试验指标,探究穿刺位置、相对含水率、穿刺速度对茎秆穿刺力的影响。结果表明:随茎秆直径的增加,茎秆的穿刺力明显增大;随相对含水率的提高,穿刺力逐渐下降;穿刺力与穿刺速度呈正相关。在茎秆的化学组分中,木质素含量的平均值最高(24.980%),其次为纤维素含量(17.269%),最后为半纤维素含量(16.935%);相对含水率对穿刺力有显著影响,而穿刺位置和穿刺速度对穿刺力影响不显著。研究结果可为油用牡丹茎秆穿刺力学特性研究提供参考。

The puncture mechanical property of oil peony stem was studied to provide a basis for the efficient harvest of the pod of oil peony.The oil peony of Fengdanbai variety in Luoyang was picked as the research object,the mechanical strength of oil peony stem was measured by the texture analyzer.The physical characteristic parameters such as stem puncture force,diameter and relative moisture content,as well as the content of chemical components such as cellulose,hemicellulose and lignin were analyzed.Then,the puncture force was used as an experimental index to explore the effects of puncture position,relative moisture content and puncture speed on the puncture force of stem.The results showed that the puncture force of stem increased significantly with the increased of stem diameter.With the increased of relative mois-ture content,the puncture force decreased gradually.Besides,there was a positive correlation between puncture force and puncture speed.In the chemical components of stem,the average value of lignin content was the highest(24.980%),followed by cellulose content(17.269%),and finally hemicellulose content(16.935%).The relative moisture content had a significant effect on the puncture force,but the puncture position and puncture speed have no significant effect with the puncture force.The research results could provide a reference for the study of puncture mechanical properties of oil peony stem.