Authors

Abstract

It is urgent to study the damage mechanism of corn kernels and find ways of reducing the rate of kernel breakage in mechanical threshing. This paper, by studying the mechanical curves and deformation characteristics of corn kernels with different moisture contents, points out the brittle mechanical characteristics of corn kernel damage fracture with low moisture content, and clarifies the the variation law of mechanical properties of kernels with moisture contents. The experimental data of fatigue load - fatigue life curves of corn kernels with different moisture contents were described by the power function equation. At the same time, the fatigue life and damage characteristics of kernel with different moisture content were analyzed, and the accuracy of the fitting equation was verified. Through mathematical statistical analysis, the normal distribution curve of fatigue life was fitted, and the variation law of normal distribution curve with moisture content and fatigue load was determined.

Abstract in Chinese

研究玉米籽粒损伤机理，降低籽粒破碎率是当前机械脱粒的热门问题。通过研究不同含水率玉米籽粒的力学曲线与变形特点，确定了低含水率玉米籽粒损伤断裂的脆性力学特点，明确了籽粒力学特性随含水率变化规律。采用幂函数方程描述了不同含水率玉米籽粒的疲劳载荷Fj-疲劳寿命Nj曲线试验数据，对不同含水率籽粒的疲劳寿命及损伤特点进行了分析，并验证了拟合方程结果的准确性；通过数理统计分析，拟合了疲劳寿命正态分布曲线，确定了正态分布曲线随含水率、疲劳载荷的变化规律。