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| 油莎豆的剪切力学特性 |
| Shearing mechanical properties of Cyperus esculentus |
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| DOI： |
| 中文关键词: 油莎豆 脱皮 剪切试验 破坏力 硬度 破坏能 |
| 英文关键词:Cyperus esculentus peeling shearing test breaking force hardness breaking energy |
| 基金项目: |
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| 中文摘要: |
| 为选择适宜的油莎豆破碎设备，探究了脱皮前后油莎豆剪切力学特性变化。以油莎豆为试验原料，利用物性分析仪,在初步考察脱皮对油莎豆剪切特性影响基础上，分别探讨了水分含量、加载速率、加载方位和粒径等级对未脱皮和脱皮油莎豆破坏力、硬度和破坏能的影响。结果表明：脱皮对油莎豆的剪切特性存在影响;水分含量、加载速率、加载方位和粒径等级均对未脱皮和脱皮油莎豆的破坏力、硬度和破坏能具有显著影响。未脱皮和脱皮油莎豆的破坏力、硬度和破坏能随油莎豆水分含量增大以及粒径的减小而降低，随加载速率增加呈先增大后降低的趋势，并在加载速率为0.3 mm/s时获得较大值。在抗剪切能力上脱皮油莎豆X轴最大，Z轴次之，Y轴最小，未脱皮油莎豆Z轴最大，X轴次之，Y轴最小。此外，在相同的剪切条件下，脱皮油莎豆的破坏力、硬度和破坏能均远低于未脱皮油莎豆的。研究结果可为油莎豆加工机械改进和工艺条件制订提供必要的理论依据。 |
| 英文摘要: |
| In order to select suitable crushing equipment, the changes of shearing mechanical properties of Cyperus esculentus before and after peeling were investigated. Based on the preliminary investigation of the effect of peeling on the shearing properties of Cyperus esculentus, the effects of moisture content, loading rate, loading orientation and particle size on the breaking force, hardness and breaking energy of unpeeled and peeled Cyperus esculentus were investigated by using the physical property analyzer. The results showed that there was an effect of peeling on the shearing properties of Cyperus esculentus.The moisture content, loading rate, loading orientation and particle size all had significant effects on the breaking force, hardness and breaking energy of unpeeled and peeled Cyperus esculentus. The breaking force, hardness and breaking energy of unpeeled and peeled Cyperus esculentus decreased with the increasing of moisture content and the decreasing of particle size, while tended to increase and then decrease with the increasing of loading rate, and a larger value obtained at a loading rate of 0.3 mm/s. The shear resistance was the greatest in the X-axis, followed by the Z-axis and the least in the Y-axis for peeled Cyperus esculentus, and it was the greatest in the Z-axis, followed by the X-axis and the least in the Y-axis for unpeeled Cyperus esculentus. In addition, under the same shearing conditions, the breaking force, hardness and breaking energy of peeled Cyperus esculentus were much lower than those of unpeeled Cyperus esculentus. The results of the study can provide the necessary theoretical basis for the improvement of processing machinery and the setting of process conditions for Cyperus esculentus. |
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