Investigation of mechanical properties of cotton stalk based on multi-component analyses

IF 2 4区农林科学 Q2 AGRONOMY

International Agrophysics Pub Date : 2022-09-07 DOI:10.31545/intagr/152488

Wei-jun Zhao, Jianhua Xie, Zhenwei Wang, Qiming Gao, Mingjiang Chen

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引用次数: 1

Abstract

. A comprehensive understanding of the uprooting failure mechanism will likely require the accurate characterization of the mechanical properties of cotton stalk. Uprooting failure includes a fractured cotton stalk and peeled phloem sliding along the xylem. The modulus of elasticity of cotton stalk and its tissues (xylem and phloem) were measured using three different modes (tensile, compression and bending), and the reasons for the fractured cotton stalk and the peeled phloem sliding along the xylem were analysed from the perspective of composite mechanics. The results showed that the cotton stalk radially conforms to the properties of the composite with transverse anisotropy. The axial modulus of elasticity was significantly larger than the radial modulus of elasticity (axial modulus of elasticity: cotton stalk is 3181.79 MPa, xylem is 1093.91 MPa, phloem is 249.89 MPa, radial modulus of elasticity: is 91.04 MPa, xylem is 83.77 MPa, phloem is 77.01 MPa). Xylem is the backbone of the stalk that provides 96% of its compressive strength. The direct cause of fractured cotton stalk originated from the load force that exceeded its intrinsic compressive strength. Peeled phloem sliding along the xylem was related for the most part to the different radial modu lus of elasticity of the xylem and phloem, and the weak cohesion between these two tissues. Based on the results, some suggestions were provided for the design of a puller.

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基于多组分分析的棉秆力学性能研究

.全面了解连根拔起失效机制可能需要准确表征棉秆的机械性能。生根失败包括棉花茎断裂和韧皮部剥落沿木质部滑动。采用拉伸、压缩和弯曲三种不同的方式测定了棉秆及其组织（木质部和韧皮部）的弹性模量，并从复合力学的角度分析了棉秆断裂和韧皮部剥落沿木质部滑动的原因。结果表明，棉秆在径向上符合具有横向各向异性的复合材料的性能。轴向弹性模量显著大于径向弹性模量（轴向弹性模量：棉秆为3181.79 MPa，木质部为1093.91 MPa，韧皮部为249.89 MPa，径向弹性模量：为91.04 MPa，木质部分为83.77 MPa，韧皮部分为77.01 MPa）。木质部是茎的主干，提供96%的抗压强度。棉秆断裂的直接原因是载荷力超过了其固有抗压强度。韧皮部剥落沿木质部滑动在很大程度上与木质部和韧皮部的径向弹性方式不同以及这两个组织之间的内聚力较弱有关。在此基础上，对拉拔器的设计提出了一些建议。

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来源期刊

International Agrophysics 农林科学-农艺学

CiteScore

3.60

自引率

9.10%

发文量

审稿时长

3 months

期刊介绍： The journal is focused on the soil-plant-atmosphere system. The journal publishes original research and review papers on any subject regarding soil, plant and atmosphere and the interface in between. Manuscripts on postharvest processing and quality of crops are also welcomed. Particularly the journal is focused on the following areas: implications of agricultural land use, soil management and climate change on production of biomass and renewable energy, soil structure, cycling of carbon, water, heat and nutrients, biota, greenhouse gases and environment, soil-plant-atmosphere continuum and ways of its regulation to increase efficiency of water, energy and chemicals in agriculture, postharvest management and processing of agricultural and horticultural products in relation to food quality and safety, mathematical modeling of physical processes affecting environment quality, plant production and postharvest processing, advances in sensors and communication devices to measure and collect information about physical conditions in agricultural and natural environments. Papers accepted in the International Agrophysics should reveal substantial novelty and include thoughtful physical, biological and chemical interpretation and accurate description of the methods used. All manuscripts are initially checked on topic suitability and linguistic quality.