温度效应下大豆动力剪切特性的试验研究Experimental study on dynamic shear characteristics of soybean under temperature effect

• Published in: Zhongguo you zhi Vol. 50; no. 4; pp. 147 - 152
• Main Author: 曾长女1，周君杰1，罗晋1，王明轩2 ZENG Changnv1, ZHOU Junjie1, LUO Jin1, WANG Mingxuan2
• Format: Journal Article
• Language: English
• Published: 中粮工科（西安）国际工程有限公司 01.04.2025
• Subjects: temperature-controlled direct shear apparatus; soybean grain group; cyclic shearing; temperature; initial moisture content; 温控直剪仪；大豆籽粒群；循环剪切；温度；初始含水率
• ISSN: 1003-7969
• DOI: 10.19902/j.cnki.zgyz.1003-7969.240117

为了获取温度效应下大豆籽粒群的动力剪切特性，为粮仓结构设计提供理论依据，采用粮食温控静动直剪仪对大豆籽粒群进行循环剪切试验，研究温度（25、35、45 ℃）与初始含水率（8.99%、12.24%、15.12%）对大豆动力剪切强度特性的影响，并对大豆籽粒群循环剪切动力参数进行分析。结果表明：在初始含水率8.99%条件下，当大豆籽粒群温度由25 ℃升高至35、45 ℃时，完成循环剪切时对应的峰值剪应力分别降低2.28%、5.28%；在45 ℃条件下，当大豆籽粒群的初始含水率由8.89%升至12.24%、15.12%时，完成循环剪切时对应的峰值剪应力上升幅度分别为8.44%、-22.91%；随着温度升高和初始含水率增加，大豆籽粒群的剪缩现象加剧；随着初始含水率的增加，大豆籽粒群剪切刚度呈先上升后下降的变化趋势，而升高温度则使大豆籽粒群的剪切刚度单调下降；随着初始含水率的增加和温度的升高，大豆籽粒群的阻尼比总体呈降低趋势。综上，在储存大豆时，可通过控制储存环境的温湿度来保护大豆籽粒的完整性。To obtain the dynamic shear characteristics of soybean grain group under temperature effect and provide theoretical basis for the structural design of granary, the cyclic shear test of soybean grain group was carried out by using grain temperature-controlled static and dynamic direct shear apparatus. The effects of temperature (25, 35, 45 ℃) and initial moisture content (8.99%, 12.24%, 15.12%) on the dynamic shear strength characteristics of soybean were studied, and the cyclic shear dynamic parameters of soybean grain group were analyzed. The results showed that under the condition of initial moisture content of 8.99%, when the temperature of soybean grain group increased from 25 ℃ to 35 ℃ and 45 ℃, the peak shear stress corresponding to the completion of cyclic shear decreased by 2.28% and 5.28%, respectively. At 45 ℃, when the initial moisture content of soybean grain group increased from 8.89% to 12.24% and 15.12%, the corresponding peak shear stress increased by 8.44% and -22.91%, respectively. With the increase of temperature and initial moisture content, the shear shrinkage of soybean grain group increased. With the increase of initial moisture content, the shear stiffness of soybean grain group increased first and then decreased, while the shear stiffness of soybean grain group decreased monotonously with the increase of temperature. With the increase of initial moisture content and temperature, the damping ratio of soybean grain group showed a decreasing trend. In summary, when storing soybean seeds, the integrity of the seeds can be protected by controlling the temperature and humidity of the storage environment.