Mechanical properties and energy evolution mechanism of wheat grain under uniaxial compression

IF 2.7 2区 农林科学 Q1 ENTOMOLOGY
Chi Zhang , Jiyun Hu , Qin Xu , Junhao Guan , Haitao Liu
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Abstract

To determine the mechanical properties and energy evolution characteristics of wheat kernels during compression, the mechanical properties and energy evolution of wheat kernels with high-gluten, medium-gluten, and low-gluten were analyzed in uniaxial compression test. Based on the theory of Hertz's formula, the stress-strain laws of the three varieties of wheat kernels in the process of compression damage were investigated; Based on the law of energy conservation, the energy evolution characteristics of the three varieties of wheat kernels under the same compression conditions were analyzed. The results showed that the stress-strain process of wheat kernels with high-gluten, medium-gluten, and low-gluten under compressive stress followed a similar trend overall, with the corresponding minimum failure strengths at the peak being 51.79 MPa, 50.07 MPa, and 46.21 MPa, respectively. The energy evolution patterns of three varieties of wheat kernels under uniaxial compressive loading were approximately the same, indicating that the elastic energy was mainly accumulated before the peak and reached the maximum at the peak. In contrast, the proportion of dissipated energy increases after the peak and rapidly exceeds the elastic energy. In this paper, the damage characteristics of wheat kernels are described from the energy point of view, which is of great significance for the new conceptualization of the evolution of wheat grain damage.

单轴压缩下小麦籽粒的力学性能和能量演化机理
为了确定小麦籽粒在压缩过程中的力学性能和能量演化特性,分析了高筋、中筋和低筋小麦籽粒在单轴压缩试验中的力学性能和能量演化特性。根据赫兹公式理论,研究了三个品种麦仁在压缩破坏过程中的应力-应变规律;根据能量守恒定律,分析了三个品种麦仁在相同压缩条件下的能量演化特征。结果表明,高筋、中筋和低筋小麦籽粒在压缩应力下的应力-应变过程总体趋势相似,峰值时对应的最小破坏强度分别为 51.79 MPa、50.07 MPa 和 46.21 MPa。三个品种的麦粒在单轴压应力下的能量演变模式大致相同,表明弹性能量主要在峰值之前积累,并在峰值时达到最大。相反,耗散能量的比例在峰值之后增加,并迅速超过弹性能量。本文从能量的角度描述了小麦籽粒的损伤特征,这对小麦籽粒损伤演变的新概念化具有重要意义。
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来源期刊
CiteScore
5.70
自引率
18.50%
发文量
112
审稿时长
45 days
期刊介绍: The Journal of Stored Products Research provides an international medium for the publication of both reviews and original results from laboratory and field studies on the preservation and safety of stored products, notably food stocks, covering storage-related problems from the producer through the supply chain to the consumer. Stored products are characterised by having relatively low moisture content and include raw and semi-processed foods, animal feedstuffs, and a range of other durable items, including materials such as clothing or museum artefacts.
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