Faculty of Technical Sciences, University of Warmia and Mazury in Olsztyn, Olsztyn, Poland.
J Texture Stud. 2020 Aug;51(4):593-600. doi: 10.1111/jtxs.12512. Epub 2020 Feb 19.
The aim of this study was to determine the compression characteristics of nonhomogeneous plant materials with a complex morphological structure (beetroots, celery roots, and potato tubers), to compare the analyzed samples with the compression characteristics of reference materials (homogeneous isotropic structural materials: steel coil spring and vulcanized rubber), and to determine the influence of the compression rate on stress in compressed samples. Structural materials and plant materials clearly differed in compression characteristics. Excluding the short initial compression phase, the compression curves for the steel coil spring and vulcanized rubber were straight parallel lines, and the higher the crosshead speed, the higher the lines' location in the diagram. In tests conducted on plant materials, the rate of changes in compression force increased throughout the experiment with an increase in crosshead speed. The greatest variations in compression force resulting from differences in crosshead speed were observed in potato samples. The apparent retardation times determined in the developed rheological model ranged from 0.079 s for the steel coil spring to 6.863 s for potatoes.
本研究旨在确定具有复杂形态结构的非均相植物材料（甜菜根、芹菜根和土豆）的压缩特性，将分析样本与参考材料（均质各向同性结构材料：钢卷弹簧和硫化橡胶）的压缩特性进行比较，并确定压缩速率对压缩样品中应力的影响。结构材料和植物材料的压缩特性明显不同。除了短暂的初始压缩阶段外，钢卷弹簧和硫化橡胶的压缩曲线呈直线平行，并且随着十字头速度的增加，线在图表中的位置越高。在对植物材料进行的测试中，随着十字头速度的增加，压缩力的变化率在整个实验过程中增加。由于十字头速度的差异，导致压缩力的最大变化出现在土豆样品中。在开发的流变学模型中确定的表观延迟时间范围从钢卷弹簧的 0.079 s 到土豆的 6.863 s。
