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颗粒流动过程中形成的力链结构与剪切速度特征关系密切.利用同心圆筒实验研究了颗粒中慢速流动过程中切应力波动规律和力链形成条件.研究结果表明,不同剪切速度下和颗粒直径条件下颗粒切应力波动幅度有较大差异,但切应力波动频谱曲线均呈现反“S”形状,正应力高值压痕实验可以揭示颗粒流中形成的动态力链结构,不同条件下形成力链的临界条件不同.本文研究结果对分析自然界和工业领域颗粒流问题具有借鉴意义.
The force chain structure formed during particle flow is closely related to the shear velocity characteristics. The concentric cylinder experiment was used to study the shear stress fluctuation and the formation of force chain during the slow flow of particles. The results show that under different shear rates However, the amplitude of the shear stress fluctuates greatly under the condition of particle diameter. However, the spectrum of shear stress fluctuates in the shape of “S”, and the positive stress high indentation experiment can reveal the dynamic force chain structure formed in the particle flow, The critical conditions for the formation of the force chain under different conditions are different.The results of this paper can be used for reference to analyze the particle flow problems in nature and industry.