scholarly journals Granular Material Flow in Two-Dimensional Hoppers

1978 ◽  
Vol 45 (1) ◽  
pp. 43-50 ◽  
Author(s):  
C. Brennen ◽  
J. C. Pearce
Keyword(s):  
Granular Material ◽  
Material Flow ◽  
Two Dimensional

Elimination of Vibrations in an Ore Unloading Bin

1974 ◽  
Vol 96 (3) ◽  
pp. 761-764 ◽  
Author(s):  
M. L. Wei ◽  
J. R. Johanson
Keyword(s):  
Granular Material ◽  
Flow Control ◽  
Material Flow ◽  
Natural Frequencies ◽  
Flow Patterns ◽  
Corrective Measures

Problems of undesirable vibrations in an ore unloading structure are described. Earlier unsuccessful attempts to eliminate vibrations by changing allegedly exciting frequencies mechanically and by increasing natural frequencies structurally are cited. Scientific evaluations of granular material flow patterns in the bin are presented, which identify possible causes of and methods to alleviate the vibrations. Finally, the corrective measures in flow control taken to eliminate vibrations are illustrated.

An Investigation of the Predicting Capabilities of a Variable Flow Stress Machining Theory

2001 ◽  
Author(s):  
P. Mathew
Keyword(s):  
Flow Stress ◽  
Material Flow ◽  
Three Dimensional ◽  
Experimental Results ◽  
Two Dimensional ◽  
Variable Flow ◽  
Comparative Results ◽  
Intermittent Cutting ◽  
Theoretical Results ◽  
Modelling Approach

Abstract The Oxley Machining Theory, which has been developed over the last 40 years, is presented in this paper. The capability of the model is described with its initial two-dimensional machining approach followed by the extension to the generalised model for three-dimensional machining. The theoretical results from the model are compared with the experimental results to determine the model capability. A brief description of the work associated with the effect of strain hardening at the interface is presented and comparative results are shown. A further extension of the model to intermittent cutting process of reaming is also presented and a comparison with the experimental results indicates the model developed is quite capable of predicting cutting forces for reaming. In explaining the results obtain, the assumptions made are explained and the inputs required. The limitations of the modelling approach are presented. It is pointed out that the Oxley model is a versatile model as long as proper description of the material flow stress properties is presented.

scholarly journals Response of granular-material flow to abrupt change of surface-shear force

1996 ◽  
Vol 40 ◽  
pp. 1045-1050
Author(s):  
Hitoshi GOTOH ◽  
Tetsuo SAKAI ◽  
Yasuharu TOYOTA ◽  
Atsushi SAKAI
Keyword(s):  
Granular Material ◽  
Material Flow ◽  
Shear Force ◽  
Abrupt Change ◽  
Surface Shear

scholarly journals Limiting stress states in granular avalanches

1998 ◽  
Vol 26 ◽  
pp. 272-276 ◽  
Author(s):  
Y.C. Tai ◽  
J.M.N.T. Gray
Keyword(s):  
Stress State ◽  
Numerical Methods ◽  
Granular Material ◽  
Laboratory Experiments ◽  
Complex Geometry ◽  
The Other ◽  
Two Dimensional ◽  
Singular Surfaces ◽  
Rapid Convergence ◽  
Stress States

The Savage-Hutter theory for granular avalanches assumes that the granular material is in either of two limiting stress states, depending on whether the motion is convergent or divergent. At transitions between convergent and divergent regions, a jump in stress occurs, which necessarily implies that there is a jump in the avalanche velocity and/or its thickness. In this paper, a regularizaron scheme is used, which smoothly switches from one stress state to the other, and avoids the generation of such singular surfaces. The resulting algorithm is more stable than previous numerical methods but shocks can still occur during rapid convergence in the run-out zone. Results are presented from two-dimensional calculations on complex geometry which illustrate that some necking features observed in laboratory experiments can be explained by the regularized Savage-Hutter model.

Density Effects in Two-Dimensional Bins

1990 ◽  
Vol 57 (4) ◽  
pp. 1032-1035
Author(s):  
N. P. Kruyt
Keyword(s):  
Granular Material ◽  
Approximate Theory ◽  
Two Dimensional ◽  
Density Effects

Various theories exist for predicting the pressure on the walls of bins filled with granular material. These theories, such as Janssen’s (1895) theory, usually neglect the effect of the compressibility of the granular material, which is relevant for many materials. Here this effect is studied numerically, and the results are compared with a new approximate theory. This comparison shows that the agreement is excellent.

scholarly journals Flows of granular material in two-dimensional channels

2015 ◽  
Vol 98 (1) ◽  
pp. 49-70
Author(s):  
Oliver Bain ◽  
John Billingham ◽  
Paul Houston ◽  
Ian Lowndes
Keyword(s):  
Granular Material ◽  
Two Dimensional

scholarly journals Deformation of granular material flow in converging channels

2018 ◽  
Vol 206 ◽  
pp. 012004
Author(s):  
A P Bobryakov ◽  
S V Klishin ◽  
V P Kosykh ◽  
S V Lavrikov ◽  
O A Mikenina ◽  
...  
Keyword(s):  
Granular Material ◽  
Material Flow

Numerical Simulation by DDA and the Fabrics Analysis of Two Dimensional Experiment on Coarse Granular Material

2012 ◽  
Vol 170-173 ◽  
pp. 3621-3629
Author(s):  
Pei Xi Guo ◽  
Shao Zhong Lin
Keyword(s):  
Numerical Simulation ◽  
Laboratory Test ◽  
Granular Material ◽  
Simulation Model ◽  
Mechanical Characteristics ◽  
Discontinuous Deformation Analysis ◽  
Deformation Analysis ◽  
Two Dimensional ◽  
Stress Strain ◽  
Discontinuous Deformation

DDA(Discontinuous Deformation Analysis) was used to study the mechanical characteristics of coarse granular material (CGM). The numerical simulation model was found consulting the two Dimensional test of CGM,and the stress-strain curves obtained by the numerical simulation were basically in agreement with the results of laboratory test. It indicates that the numerical simulation is suitable for the mechanical characteristic research of CGM. In addition,the distribution statistic of several fabric elements about interaction between particles was also presented. Some relation between the stress-strain and fabric element change are found after analysis.

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