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玉米茎的弹性模量。

The elastic modulus for maize stems.

作者信息

Al-Zube Loay, Sun Wenhuan, Robertson Daniel, Cook Douglas

机构信息

1Division of Engineering, New York University-Abu Dhabi, P.O. Box 129188, Abu Dhabi, United Arab Emirates.

2Faculty of Engineering, The Hashemite University, P.O. Box 330127, Zarqa, Jordan.

出版信息

Plant Methods. 2018 Feb 8;14:11. doi: 10.1186/s13007-018-0279-6. eCollection 2018.

DOI:10.1186/s13007-018-0279-6
PMID:29449871
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC5806466/
Abstract

BACKGROUND

Stalk lodging is a serious challenge in the production of maize and sorghum. A comprehensive understanding of lodging will likely require accurate characterizations of the mechanical properties of such plants. One of the most important mechanical properties for structural analysis of bending is the modulus of elasticity. The purpose of this study was to measure the modulus of elasticity of dry, mature maize rind tissues using three different loading modes (, and ), and to determine the accuracy and reliability of each test method.

RESULTS

The three testing modes produced comparable elastic modulus values. For the sample in this study, modulus values ranged between 6 and 16 GPa. All three testing modes exhibited relatively favorable repeatability (i.e. test-to-test variation of < 5%). Modulus values of internodal specimens were significantly higher than specimens consisting of both nodal and internodal tissues, indicating spatial variation in the modulus of elasticity between the nodal and internodal regions.

CONCLUSIONS

Bending tests were found to be the least labor intensive method and also demonstrated the best test-to-test repeatability. This test provides a single aggregate stiffness value for an entire stalk. Compression tests were able to determine more localized (i.e., spatially dependent) modulus of elasticity values, but required additional sample preparation and test time. Finally, tensile tests provided the most focused measurements of the modulus of elasticity, but required the longest sample preparation time.

摘要

背景

茎倒伏是玉米和高粱生产中的一个严峻挑战。全面了解倒伏情况可能需要准确描述此类植物的力学特性。对于弯曲结构分析而言，最重要的力学特性之一是弹性模量。本研究的目的是使用三种不同加载模式（、和）测量干燥成熟玉米外皮组织的弹性模量，并确定每种测试方法的准确性和可靠性。

结果

三种测试模式产生了可比的弹性模量值。对于本研究中的样本，模量值在6至16吉帕之间。所有三种测试模式都表现出相对良好的重复性（即每次测试之间的变化<5%）。节间标本的模量值显著高于由节和节间组织组成的标本，表明节和节间区域之间弹性模量存在空间差异。

结论

弯曲试验被发现是劳动强度最小的方法，并且也表现出最佳的每次测试重复性。该测试为整个茎提供了一个单一的总刚度值。压缩试验能够确定更局部化（即空间相关）的弹性模量值，但需要额外的样本制备和测试时间。最后，拉伸试验提供了最集中的弹性模量测量值，但需要最长的样本制备时间。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4144/5806466/c9ba4400b476/13007_2018_279_Fig7_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4144/5806466/4faeb7c3ac14/13007_2018_279_Fig1_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4144/5806466/c01a9c548c34/13007_2018_279_Fig2_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4144/5806466/caa4cb45c9c6/13007_2018_279_Fig3_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4144/5806466/9b1caa066709/13007_2018_279_Fig4_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4144/5806466/e5918fadf747/13007_2018_279_Fig5_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4144/5806466/cd839b320745/13007_2018_279_Fig6_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4144/5806466/c9ba4400b476/13007_2018_279_Fig7_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4144/5806466/4faeb7c3ac14/13007_2018_279_Fig1_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4144/5806466/c01a9c548c34/13007_2018_279_Fig2_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4144/5806466/caa4cb45c9c6/13007_2018_279_Fig3_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4144/5806466/9b1caa066709/13007_2018_279_Fig4_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4144/5806466/e5918fadf747/13007_2018_279_Fig5_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4144/5806466/cd839b320745/13007_2018_279_Fig6_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4144/5806466/c9ba4400b476/13007_2018_279_Fig7_HTML.jpg

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