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| Cracking mechanical properties of Xiangling walnut green peel |
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| DOI： |
| KeyWord:green walnuts peeling geometric characteristics mechanical property tests |
| FundProject:国家重点研发计划项目（2019YFD1002401-3） |
| Author Name | Affiliation | | CHEN Xiuwen1,2, LI Wenbin1,2, BAI Xiaopeng1,2, XU Daochun1,2 | 1.School of Technology, Beijing Forestry University, Beijing 100083, China
2.Key Laboratory of State
Forestry Administration for Forestry Equipment and Automation, Beijing 100083, China |
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| Abstract: |
| In order to provide theoretical basis for the design of green walnut peeling equipment and improve the peeling process, the geometric characteristics of Xiangling green walnut were determined, and the single factor mechanical property tests were carried out under different conditions by microcomputer controlled electronic universal testing machine. The effects of loading direction, loading rate, overall dimension, blade cutting treatment, shade placement theatment and green peel moisture content were analyzed by using the cracking force and power consumption as evaluation indexes, and the curve of force changing with displacement during the loading process of green walnut was fitted. The results showed that the average sphericity of Xiangling green walnut was 0.94, and the thickness of green peel at different parts was not uniform, and the green walnut could be simplified as a sphere with non-uniform shell. There was only one crack in the green peel under compression and it appeared along the extrusion direction. The grean peel cracking was affected by the loading direction and overall dimension. The green peel was easy to crack by extrusion along the longitudinal diameter. The larger the size grade of green walnut, the more difficult to break the peel. The effect of loading rates on the cracking force and power consumption of green peel was not significant. Reducing the moisture content of green peel by drying could affect the cracking force and power consumption of green peel. If the green walnut was squeezed after placing indoors in the shade for 60 h or being cut with a blade, the green peel was obviously easier to crack. In order to better remove the peel of green walunt, measures can be taken such as grading, cutting the surface of green walnut with blades, placing in shade and so on. |
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