实验和数值模拟研究玉米粒的损伤特征和破裂行为
Guixiang Chen1, Hao Zhang2, Yahao Yuan2
1School of Civil Engineering, Henan University of Technology, Zhengzhou 450001, China; Henan Key Laboratory of Grain and Oil Storage Facility & Safety, Henan University of Technology, Zhengzhou 450001, China.
Food research international (Ottawa, Ont.)
|February 28, 2026
概括
玉米核的机械性能取决于水分和形态. 石玉米比半角玉米更坚固,破裂更少,这些发现适用于谷物处理和加工.
科学领域:
- 农业工程 农业工程
- 材料科学 材料科学 材料科学
- 生物力学 生物力学
背景情况:
- 了解玉米核的机械特性对于优化处理,储存和加工至关重要.
- 湿度含量和核形态的变化显著影响玉米的物理行为.
研究的目的:
- 为了研究半和石玉米粒的机械性能和破裂行为.
- 分析水分含量和玉米核形态对玉米核骨折模式和能量吸收的影响.
- 开发和验证用于预测玉米核损伤的数值模拟方法.
主要方法:
- 进行了单轴压缩,单核减重冲击和多核旋转冲击试验.
- 检查了不同谷物形态和水分含量的机械性能.
- 开发并验证了有限元模型 (FEM),并提出了用于破裂模拟的扩展有限元方法 (XFEM).
主要成果:
- 含水量和核的形态显著影响损伤和破损.
- 低湿度会导致脆的行为;增加的湿度会使核变软,降低强度和刚性.
- 石核表现出优越的压力性能,更高的关键断裂/断裂能量,和较低的断裂比率与半的核相比.
- 冲击负荷将断裂模式从脆性转变为塑料,增加水分含量.
结论:
- 含水量和玉米核形态是玉米核机械反应和失效的关键决定因素.
- 石玉米表现出优越的机械弹性,超过半角玉米.
- 基于XFEM的模拟方法准确地捕捉了玉米核的损伤和断裂行为,为进一步的研究和应用提供了有价值的工具.
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