Authors

Abstract

In this study,the mechanical properties of three varieties of cerasus humilis at different temperatures were systematically investigated by whole fruit puncture test, exocarp uniaxial tensile test and mesocarp uniaxial compression test.It was found that puncture test could not only reflect the shear mechanics of the exocarp in vivo at the tissue level, but also characterize the resistance level of fruit to puncture damage at the macro level.The environmental temperature had significant negative and positive effects on puncture failure stress and puncture failure deformation of cerasus humilis (p<0.05).The stress and elastic modulus of exocarp tension and mesocarp compression were significantly affected by ambient temperature (p<0.05).This study combined with temperature change to study the mechanical properties of cerasus humilis provides a necessary theoretical basis for the prediction of fruit damage and the development of postharvest treatment equipment.

Abstract in Chinese

本文采用全果穿刺试验、外果皮单轴拉伸试验和中果皮单轴压缩试验，系统研究了3个欧李品种在不同温度下的力学特性研究。穿刺试验结果反映了环境温度对欧李穿刺破坏应力和穿刺破坏变形分别有显著的负向和正向影响(p < 0.05)。研究发现，穿刺试验不仅能在组织水平上反映果皮在体内的剪切力学，而且能在宏观水平上表征果实对穿刺损伤的抵抗水平。而外果皮拉伸试验和中果皮压缩试验结果反映了环境温度对欧李外果皮拉伸和中果皮压缩的破坏应力和弹性模量有显著的负向影响(p < 0.05)。本研究以温度为自变量研究欧李的力学特性,为预测欧李的损伤和后续分拣储存运输等处理设备的改进提供重要的理论基础。