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《Journal of Zhejiang University(Engineering Science)》 2014-12
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Analysis on avalanching motion and force chains of bed material within rotating cylinder based on discrete element method

CHEN Hui;LIU Yi-lun;ZHAO Xian-qiong;XIAO You-gang;College of Mechanical and Electrical Engineering,Central South University;College of Traffic and Transportation Engineering,Central South University;  
Considering the discrete properties of granular materials,a kinematic model was developed for the bed materials within a rotating cylinder by the discrete element method.Slumping and rolling process of the granular materials were simulated,and then force chains and distribution of contact forces between particles were investigated.The results show that the particles under rolling patterns have serious collision.Boundary line between sliding and slumping was approximately an exponential curve,and sliding was easily caused by small filling degree.The underlying area of the bed materials(about 90% of the bed thickness)is occupied by strong force chains(about 40% of the total force chains),and the surface area of bed materials is only filled with weak force chains.In the case of slumping and rolling,avalanches of particles occur mainly in area just filled with weak force chains which are broken easily.The strength of force chains has a Log-normal distribution,and the tangential force in force chain is the factor leading to chain-breaking and granular avalanches.
【Fund】: 国家自然科学基金资助项目(51374241 51275531);; 湖南省研究生科研创新资助项目(CX2014B059)
【CateGory Index】: O343.3
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