Time-Resolved Analysis of the Dynamic Behavior of Granular Materials.

1999 ◽  
Author(s):  
Min Zhou
Keyword(s):  
Granular Materials ◽  
Dynamic Behavior ◽  
Time Resolved

Dimensional Analysis to Predict Dynamic Behavior of Sand Bulk Under 2D Vibration

2008 ◽  
Author(s):  
Hadi Arjmandi Tash ◽  
Morteza Sadeghi ◽  
Arash Ranjbaran ◽  
Esmaeel Esmaeel Zadeh
Keyword(s):  
Granular Materials ◽  
Dynamic Behavior ◽  
Dimensional Analysis ◽  
Casting Process ◽  
Motion Pattern ◽  
Horizontal Vibration ◽  
Vibration Parameters ◽  
First Time ◽  
Lost Foam ◽  
Bulk Behavior

2D motion pattern of an especial type of sand, which is used in lost-foam casting process, under the horizontal vibration investigated. Under this condition, the sand bulk in the experiment cell divides into 3 different zones, every one has its own property. Using dimensional analysis for the first time for this problem, dimensionless parameters which are useful to study sand bulk behavior, were identified. It observed that simple and linear relations exist among these parameters. They can be utilized in formulizing this phenomenon, by which motion pattern of sand bulk in various conditions can be predicted and optimum of geometric and vibration parameters for different purposes can be identified. The results not only are useful for this type of sand, but also may be extended to other types of granular materials too. The used method for detection what goes in the cell, without utilizing any external probe which may change the real conditions of the experiment cell, is another innovation of this study.

Time-resolved studies of the dynamic behavior of the tendon fibers (chordae tendineae) of the human mitral valve

1989 ◽  
Vol 76 (3) ◽  
pp. 124-124
Author(s):  
D. Christmann ◽  
W. Folkhard ◽  
E. Kn�rzer ◽  
E. Mosler ◽  
Th. Nemetschek ◽  
...  
Keyword(s):  
Mitral Valve ◽  
Dynamic Behavior ◽  
Chordae Tendineae ◽  
Time Resolved

scholarly journals Visualizing lattice dynamic behavior by acquiring a single time-resolved MeV diffraction image

2021 ◽  
Vol 129 (5) ◽  
pp. 054901
Author(s):  
Xi Yang ◽  
Jing Tao ◽  
Weishi Wan ◽  
Lijun Wu ◽  
Victor Smaluk ◽  
...  
Keyword(s):  
Dynamic Behavior ◽  
Lattice Dynamic ◽  
Diffraction Image ◽  
Time Resolved ◽  
Single Time

scholarly journals Influence of Degree of Saturation (DOS) on Dynamic Behavior of Unbound Granular Materials

Geosciences ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 89
Author(s):  
Junyu Sun ◽  
Erwin Oh ◽  
Dominic Ek-Leong Ong
Keyword(s):  
Plastic Strain ◽  
Granular Materials ◽  
Dynamic Behavior ◽  
Resilient Modulus ◽  
Heavy Traffic ◽  
Degree Of Saturation ◽  
Unit Weight ◽  
Unbound Granular Materials ◽  
Traffic Volumes ◽  
Number Of Cycles

The extensive application of natural unbound granular materials (UGMs) motivates studies into the mechanical properties of alternatives such as processed crushed rocks employed commonly as base or subbase layers. The rutting and settlement generated in base and subbase layers is widely restricted in many specifications and standards. In this research, the dynamic behavior including the resilient modulus (Mr) and the plastic strain (εεp) of the crushed rocks collected from Queensland in Australia will be tested by a series of repeated load triaxial test (RLT) tests to investigate the behavior of UGMs under the fluctuation of the degree of saturation (DOS) (59%–100%). In particular, the RLT specimens were prepared in the laboratory through proper gradation under optimum moisture content (OMC) and 100% standard proctor maximum dry unit weight. Results from the RLT tests showed that UGM specimens soaked at higher DOS generated lower resilient modulus and weaker resistance to heavy traffic volumes with significant accumulation of plastic strain. The Mr and εεp of the tested aggregates under different cyclic deviator stresses of 425 kPa and 625 kPa approximately linearly decreased and approximately linearly increased as the DOS increased with a certain number of cycles up to 50,000, respectively.

scholarly journals Size segregation of irregular granular materials captured by time-resolved 3D imaging

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Parmesh Gajjar ◽  
Chris G. Johnson ◽  
James Carr ◽  
Kevin Chrispeels ◽  
J. M. N. T. Gray ◽  
...  
Keyword(s):  
Granular Materials ◽  
Complex Dynamics ◽  
Experimental Studies ◽  
Vertical Axis ◽  
Time Lapse ◽  
Brazil Nut ◽  
Size Segregation ◽  
Time Resolved ◽  
Brazil Nuts ◽  
Brazil Nut Effect

AbstractWhen opening a box of mixed nuts, a common experience is to find the largest nuts at the top. This well-known effect is the result of size-segregation where differently sized ‘particles’ sort themselves into distinct layers when shaken, vibrated or sheared. Colloquially this is known as the ‘Brazil-nut effect’. While there have been many studies into the phenomena, difficulties observing granular materials mean that we still know relatively little about the process by which irregular larger particles (the Brazil nuts) reach the top. Here, for the first time, we capture the complex dynamics of Brazil nut motion within a sheared nut mixture through time-lapse X-ray Computed Tomography (CT). We have found that the Brazil nuts do not start to rise until they have first rotated sufficiently towards the vertical axis and then ultimately return to a flat orientation when they reach the surface. We also consider why certain Brazil nuts do not rise through the pack. This study highlights the important role of particle shape and orientation in segregation. Further, this ability to track the motion in 3D will pave the way for new experimental studies of segregating mixtures and will open the door to even more realistic simulations and powerful predictive models. Understanding the effect of size and shape on segregation has implications far beyond food products including various anti-mixing behaviors critical to many industries such as pharmaceuticals and mining.

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