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| Static and dynamic shear characteristics of soybean |
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| DOI：10.12166/j.zgyz.1003-7969/2020.06.027 |
| KeyWord:soybean direct shear test cyclic shear shear stiffness damping ratio |
| FundProject:河南省高等学校重点科研项目计划(19A560009)；河南省粮油仓储建筑与安全重点实验室开放基金(2016KF-B03)；粮食公益性行业科研专项(201513001) |
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| Abstract: |
| In order to study the static and dynamic shear characteristics of soybean, monotonic direct shear and cyclic shear tests were performed using grain static and dynamic direct shear instruments. The effects of different porosity on the static shear characteristics of soybean, the effects of cyclic shear process on the dynamic shear characteristics of soybean and the effects of different working conditions on the shear stiffness and damping ratio of soybean were investigated. The results showed that the shear strength of soybean increased with the decrease of porosity, and the dilatancy became obvious. The occlusal stress and internal friction angle of soybean increased with the decrease of porosity. In the cyclic shear process, the phenomenon of shear hardening occured in soybean. The single cycle was accompanied by the alternation of shear shrinkage and shear expansion, and the relative vertical displacement increased with the increase of cycle times. The change range of shear stiffness of soybean was 7.17-17.92 kPa/mm, and the change range of damping ratio was 0.13-0.28. The increase of vertical stress resulted in the increase of shear stiffness and the decrease of damping ratio; the shear stiffness and damping ratio increased with the increase of cyclic shear amplitude; the smaller the initial porosity, the larger the shear stiffness and damping ratio corresponding to the same cycle. |
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