Carter Joseph, Hoffman Joshua, Fjeldsted Braxton, Ogilvie Grant, Cook Douglas D
Brigham Young University, Provo, USA.
Department of Mechanical Engineering, Brigham Young University, Provo, UT, 84602, USA.
Plant Methods. 2024 Sep 30;20(1):152. doi: 10.1186/s13007-024-01264-6.
Maize is the most grown feed crop in the United States. Due to wind storms and other factors, 5% of maize falls over annually. The longitudinal shear modulus of maize stalk tissues is currently unreported and may have a significant influence on stalk failure. To better understand the causes of this phenomenon, maize stalk material properties need to be measured so that they can be used as material constants in computational models that provide detailed analysis of maize stalk failure. This study reports longitudinal shear modulus of maize stalk tissue through repeated torsion testing of dry and fully mature maize stalks. Measurements were focused on the two tissues found in maize stalks: the hard outer rind and the soft inner pith. Uncertainty analysis and comparison of multiple methodologies indicated that all measurements are subject to low error and bias. The results of this study will allow researchers to better understand maize stalk failure modes through computational modeling. This will allow researchers to prevent annual maize loss through later studies. This study also provides a methodology that could be used or adapted in the measurement of tissues from other plants such as sorghum, sugarcane, etc.
玉米是美国种植最多的饲料作物。由于风暴和其他因素，每年有5%的玉米会倒伏。目前尚未报道玉米茎组织的纵向剪切模量，而它可能对茎的倒伏有重大影响。为了更好地理解这一现象的成因，需要测量玉米茎的材料特性，以便将其用作计算模型中的材料常数，从而对玉米茎的倒伏进行详细分析。本研究通过对干燥且完全成熟的玉米茎进行反复扭转试验，报告了玉米茎组织的纵向剪切模量。测量重点关注玉米茎中的两种组织：坚硬的外皮和柔软的髓心。不确定性分析和多种方法的比较表明，所有测量的误差和偏差都较小。本研究结果将使研究人员能够通过计算建模更好地理解玉米茎的倒伏模式。这将使研究人员能够通过后续研究防止每年的玉米损失。本研究还提供了一种方法，可用于或经调整后用于测量高粱、甘蔗等其他植物的组织。
