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Fracture Behavior and Mechanisms of Wheat Kernels Under Mechanical Loading
Yu Chen1, Sen Ma1, Xiaoxi Wang1
1College of Food Science and Engineering, Henan University of Technology, Zhengzhou 450001, China.
Foods (Basel, Switzerland)
|September 27, 2025
Summary
Understanding wheat kernel fracture mechanics is key to efficient milling. Shear forces reduce energy needs, while specific bran removal strategies optimize flour quality for vitreous and floury wheat types.
Area of Science:
- Agricultural Engineering
- Food Science
- Materials Science
Background:
- Wheat milling efficiency and flour quality depend on kernel fracture behavior.
- Understanding kernel fracture mechanics is crucial for optimizing cereal processing.
Purpose of the Study:
- To systematically investigate wheat kernel fracture characteristics under different mechanical loads.
- To correlate fracture behavior with kernel microstructure and milling performance.
Main Methods:
- Comparative rupture tests using shear and compression loading.
- Microstructural characterization and fractal geometry analysis.
- Controlled bran removal experiments.
Main Results:
- Shear loading reduced fracture energy by 40% compared to compression.
- Vitreous kernels showed higher fracture resistance (16.13 mJ) than floury kernels (10.45 mJ).
- Fracture modes differed: intercellular in vitreous, intracellular in floury kernels (D=1.262 vs. D=1.365).
- Outer bran layers contribute 40% to fracture resistance; vitreous kernels rely on endosperm post-5% peeling, floury kernels show progressive strength loss.
Conclusions:
- Fracture behavior is a key determinant of wheat milling outcomes.
- Optimized milling strategies include shear-based systems and tailored bran removal percentages for vitreous and floury wheat.
- Findings advance scientific understanding and industrial practices in cereal processing.
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