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1. Numerical study of force distribution/transmission in defected smooth hard-sphere crystal | |||
AN Xizhong,YANG Runyu,YU Aibing | |||
Metallurgical Engineering 23 January 2011 | |||
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Abstract:Using discrete element method (DEM), we present the force distribution/transmission in three dimensional (3D) hard-sphere crystal formed by packing of smooth particles under 3D vibration with batch-wised feeding. The distribution P(F) of large forces between spheres and the base is compared with experimental results and shows good agreement. The results show different force behavior at void defect and twin structure (caused by stacking fault), where the former creates effects on P(F) and makes its shape of either in plane or inter plane force distribution curve much broader along the packing height; and the latter can only change the force orientation and no influence on the shape of P(F) distribution. On the other hand, the forces in perfect smooth hard sphere crystal transmitted along the lattice direction, which agrees well with experimental and numerical results on ordered packing. | |||
TO cite this article:AN Xizhong,YANG Runyu,YU Aibing. Numerical study of force distribution/transmission in defected smooth hard-sphere crystal[OL].[23 January 2011] http://en.paper.edu.cn/en_releasepaper/content/4408624 |
2. Experimental Study on the Densification of two-dimensional Vibrated Equal Spheres | |||
AN Xizhong,LI Changxing,YANG Runyu,YU Aibing | |||
Metallurgical Engineering 23 January 2011 | |||
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Abstract:Densification of mono-sized sphere packings under two-dimensional (2D) vibration is experimentally studied. The effects of operation conditions, such as vibration amplitude and frequency, feeding method, vibration mode and container size on packing density are systematically analyzed. The results indicate that much denser packings than random close packing can be achieved by proper control of both vibration amplitude and frequency. Feeding method also plays an important role in densification. Higher packing density can be obtained when the number of particles fed per batch NB is less than or equal to one layer when in interval vibration mode. Packing density decreases with the increase of NB and keeps constant when NB is more than three layers per batch. However, even this, the packing density is also much higher than that in total feeding with corresponding to continuous vibration, which indicates that the interval vibration is more effective than continuous vibration to realize the very dense packing. Through the extrapolation on packing density obtained from different sized containers, the maximum packing density is 0.6757 for the total feeding method and 0.7131 for the batch-wise feeding. Partially ordered structures are observed in the final packings. | |||
TO cite this article:AN Xizhong,LI Changxing,YANG Runyu, et al. Experimental Study on the Densification of two-dimensional Vibrated Equal Spheres[OL].[23 January 2011] http://en.paper.edu.cn/en_releasepaper/content/4408567 |
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