An experimental and finite element analysis of the characteristics of soybean grain compression damage

Abstract

During mechanized harvesting, the compression of soybean grains is the main form of crushing caused by the interaction between the operating components and the soybean grains; the resulting damage characteristics of the grains are not well understood. Using Zhengdou 1307 as test materials, the characteristics of stress distributions under different moisture contents soybean grains in the horizontal, lateral, and vertical positions were measured and analyzed, the process of compressive damage was observed, and the damage characteristics due to compression forces were obtained. The test results show that the forced form and compressive displacement of a soybean grain is related to the magnitude of the compressive force, and the location of the stress concentration moves toward the contact, as the contact area decreases, breaking force decreases with increasing moisture content. The grain is subjected to the highest pressure when placed flat, and cracks along the vertical line of the hilum upon rupture. When placed laterally and vertically, the damage to the grain due to a compressive force is mainly from the separation of the two cotyledons. Practical applications The crushing rate is an important indicator to measure the harvest quality of the soybean combine. The mechanical properties of soybean grains are an important factor affecting the crushing rate. In the process of mechanized soybean harvesting, the compression of soybean grains is the main form of crushing caused by the interaction between working parts and soybean grains, but the characteristics of soybean grains damaged by compression are not clear. This study provides a reference for the analysis of soybean damage during the harvesting, transporting, storing, and other stages by studying the damage characteristics of soybean grains, and provides certain ideas for the study of other grain damage characteristics.

Determination Methods and Influencing Factors of Grain Mechanical Properties

“…Tis is greatly related to the contact area of the compression plate. Te fnite element simulation results are consistent with the compression test results, which can better explain the crack distribution of soybean when it is compressed [28]. Te fnite element model of wheat grain can better simulate the stress distribution inside wheat grain during storage.…”

The influence of papaya shape on its mass model and mechanical properties

“…Common mechanical tests to determine the mechanical properties of fruits have been recently reviewed (Li, Miao, et al, 2017). Important parameters such as failure stress, failure strain, failure energy, and Young's modulus are determined through a simple compression test which generates a force–deformation curve (Hussein et al, 2020; Jin et al, 2021; Liu et al, 2023), while characteristics such as the relaxation modulus, relaxation time, creep compliance and other viscoelastic properties are determined through stress relaxation or creep test (Kim et al, 2008; Mahiuddin et al, 2020; Sanchez et al, 2020). The determination of the mechanical characteristics of fruits enables the quantification of the loads that can lead to micro and macro mechanical damage to fruits.…”

Collision simulation of potato tubers for mechanized harvesting

“…In recent years, more and more scholars have been using finite element analysis (FEA) to analyze the damage to agricultural products under various loading conditions, such as apples, strawberries, pears, kiwifruits, and soybeans (Ahmadi et al, 2016; An et al, 2022; Du et al, 2019; Jin et al, 2021; Yousefi et al, 2016). At the same time, many scholars have conducted research on potato damage using FEA.…”