Improved Boundary Conditions for a 3D DEM Simple Shear Model
Joint Authors
Source
Issue
Vol. 2020, Issue 2020 (31 Dec. 2020), pp.1-9, 9 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2020-06-28
Country of Publication
Egypt
No. of Pages
9
Main Subjects
Abstract EN
In this study, a 3D simple shear model using DEM is built based on the boundary condition of an NGI-type bidirectional simple shear apparatus.
Stack of rings used as lateral constraints in a bidirectional simple shear test is modelled by layers of clumps which is possible to be moved by particles; different contact types and parameters are used to model the sand-loading caps, sand-latex membrane, and sand-sand contacts.
A simple shear test using the bidirectional simple shear apparatus is performed for the calibration of the 3D DEM simple shear model.
By analyzing the simulation results, the following can be concluded.
(1) Rings generated by clumps can provide an accurate boundary condition, effective in computation since no contact force is needed for a clump.
(2) In the simulation, the orientation of average contact force changed dramatically during shear.
It is in the vertical direction (90°) before shear and changes to 45° at 40% shear strain.
No shear band is observed which is consistent with the test, and particles move uniformly.
(3) In the simulation, the degree of noncoaxiality is the greatest at the beginning of shear, and it is decreased during shear.
However, the degree of noncoaxiality is still large at 20% shear strain where there is a 10° difference between the rotation angle of principal stress and principal strain increment.
American Psychological Association (APA)
Li, Yao& Su, Peifeng& Wang, Zhe. 2020. Improved Boundary Conditions for a 3D DEM Simple Shear Model. Advances in Civil Engineering،Vol. 2020, no. 2020, pp.1-9.
https://search.emarefa.net/detail/BIM-1121904
Modern Language Association (MLA)
Li, Yao…[et al.]. Improved Boundary Conditions for a 3D DEM Simple Shear Model. Advances in Civil Engineering No. 2020 (2020), pp.1-9.
https://search.emarefa.net/detail/BIM-1121904
American Medical Association (AMA)
Li, Yao& Su, Peifeng& Wang, Zhe. Improved Boundary Conditions for a 3D DEM Simple Shear Model. Advances in Civil Engineering. 2020. Vol. 2020, no. 2020, pp.1-9.
https://search.emarefa.net/detail/BIM-1121904
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-1121904