Mechanical Properties of the Rhizome of Arundo donax L.
Mechanical Properties of the Rhizome of Arundo donax L.
复制标题
芦竹根茎的力学特性。
DOI：
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发表时间：
2003
期刊：
影响因子：
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通讯作者：
H. Spatz
中科院分区：
文献类型：
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作者：
O. Speck;H. Spatz
从纵向(X)、横向-垂直(Y)、横向-水平(Z)三个维度研究了龙须草根茎节段的力学性质。拉伸、循环加载和扭转试验表明，在中空茎中发现的明显的各向异性在根茎中不那么明显。形态和解剖学检查表明，茎的力学各向异性是由于维管束和厚壁纤维与茎平行排列，嵌入木质化的薄壁组织所致。在根茎中，由于节间长度较短，并且节区占优势，根茎的解剖不均一性较小，在节区，厚壁组织纤维形成复杂的三维排列，嵌入未木质化的储存淀粉的薄壁组织中。循环加载实验表明，根状茎组织在拉应力下的粘弹性行为。此外，还研究了扭转应力下的粘弹性行为。用扫描电子显微镜对断口进行了分析，讨论了根茎在拉伸至断裂时的力学行为。
: The mechanical properties of rhizome segments of Arundo donax L. were studied in three dimensions: longitudinal (X), transverse-vertical (Y), transverse-horizontal (Z). Tensile, cyclic loading and torsional tests demonstrate that the distinct anisotropy found in the hollow stems is less pronounced in the rhizome. Morphological and anatomical examinations suggest that the mechanical anisotropy of the stem is caused by the arrangement parallel to the stem of the vascular bundles and sclerenchymatous fibres, embedded in lignified parenchyma. Anatomical inhomogeneity is less pronounced in the rhizome due to the short internode lengths, and predominance of nodal regions, where sclerenchymatous fibres form a complex three-dimensional arrangement embedded in unlignified starch-storing parenchyma. Cyclic loading experiments indicate viscoelastic behaviour of the rhizomatous tissues under tensile stress. Additionally, viscoelastic behaviour under torsional stress was studied. Mechanical behaviour of the rhizome under tension up to fracture is discussed with regard to the fracture surfaces, analysed by SEM.