Two-dimensional large strain consolidation prediction and incrementally deposited tailings

2020 ◽  
pp. 123-131
Author(s):  
C. Dai ◽  
P. J. N. Pells
Keyword(s):  
Large Strain ◽  
Two Dimensional

Large-strain consolidation analysis of PVD-installed soft soil considering the discharge capacity variation according to depth and time

2020 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Ba-Phu Nguyen ◽  
Ananta Man Singh Pradhan ◽  
Tan Hung Nguyen ◽  
Nhat-Phi Doan ◽  
Van-Quang Nguyen ◽  
...  
Keyword(s):  
Numerical Solution ◽  
Discharge Capacity ◽  
Large Strain ◽  
Soft Soil ◽  
Monitoring Data ◽  
Two Dimensional ◽  
Content Type ◽  
Prefabricated Vertical Drain ◽  
Consolidation Rate ◽  
Consolidation Behavior

Purpose The consolidation behavior of prefabricated vertical drain (PVD)-installed soft deposits mainly depends on the PVD performance. The purpose of this study is to propose a numerical solution for the consolidation of PVD-installed soft soil using the large-strain theory, in which the reduction of discharge capacity of PVD according to depth and time is simultaneously considered. Design/methodology/approach The proposed solution also takes into account the general constitute relationship of soft soil. Subsequently, the proposed solution is applied to analyze and compare with the monitoring data of two cases, one is the experimental test and another is the test embankment in Saga airport. Findings The results show that the reduction of PVD discharge capacity according to depth and time increased the duration required to achieve a certain degree of consolidation. The consolidation rate is more sensitive to the reduction of PVD discharge capacity according to time than that according to the depth. The effects of the reduction of PVD discharge capacity according to depth are more evident when PVD discharge capacity decreases. The predicted results using the proposed numerical solution were validated well with the monitoring data for both cases in verification. Research limitations/implications In this study, the variation of PVD discharge capacity is only considered in one-dimensional consolidation. However, it is challenging to implement a general expression for discharge capacity variation according to time in the two-dimensional numerical solution (two-dimensional plane strain model). This is the motivation for further study. Practical implications A geotechnical engineer could use the proposed numerical solution to predict the consolidation behavior of the drainage-improved soft deposit considering the PVD discharge capacity variation. Originality/value The large-strain consolidation of PVD-installed soft deposits could be predicted well by using the proposed numerical solution considering the PVD discharge capacity variations according to depth and time.

scholarly journals Growth and Properties of Dislocated Two-dimensional Layered Materials

MRS Advances ◽  
2020 ◽  
Vol 5 (64) ◽  
pp. 3437-3452
Author(s):  
Rui Chen ◽  
Jinhua Cao ◽  
Stephen Gee ◽  
Yin Liu ◽  
Jie Yao
Keyword(s):  
Catalytic Properties ◽  
Large Strain ◽  
Layered Materials ◽  
Research Field ◽  
Two Dimensional ◽  
Research Attention ◽  
Stacking Order ◽  
2D Layered Materials ◽  
Considerable Research ◽  
Local Modification

AbstractTwo-dimensional (2D) layered materials hosting dislocations have attracted considerable research attention in recent years. In particular, screw dislocations can result in a spiral topology and an interlayer twist in the layered materials, significantly impacting the stacking order and symmetry of the layers. Moreover, the dislocations with large strain and heavily distorted atomic registry can result in a local modification of the structures around the dislocation. The dislocations thus provide a useful route to engineering optical, electrical, thermal, mechanical and catalytic properties of the 2D layered materials, which show great potential to bring new functionalities. This article presents a comprehensive review of the experimental and theoretical progress on the growth and properties of the dislocated 2D layered materials. It also offers an outlook on the future works in this promising research field.

Charge doping induced reversible multistep structural phase transitions and electromechanical actuation in two-dimensional 1T′-MoS2

Nanoscale ◽  
2020 ◽  
Vol 12 (23) ◽  
pp. 12541-12550 ◽  
Author(s):  
Kaiyun Chen ◽  
Junkai Deng ◽  
Qian Shi ◽  
Xiangdong Ding ◽  
Jun Sun ◽  
...  
Keyword(s):  
Phase Transitions ◽  
Charge Density Wave ◽  
Large Strain ◽  
Structural Phase ◽  
Density Wave ◽  
Two Dimensional ◽  
Structural Phase Transitions ◽  
Wave State ◽  
Charge Doping ◽  
Electromechanical Actuation

Charge doping could effectively modulate the charge density wave state of monolayer MoS2 with large strain output and superelasticity.

A large strain theory for the two dimensional problems in geomechanics

1986 ◽  
Vol 10 (1) ◽  
pp. 17-39 ◽  
Author(s):  
Panagiotis D. Kiousis ◽  
George Z. Voyiadjis ◽  
Mehmet T. Tumay
Keyword(s):  
Large Strain ◽  
Strain Theory ◽  
Two Dimensional

LaCoDe: A Lagrangian two-dimensional thermo-mechanical code for large-strain compressible visco-elastic geodynamical modeling

2019 ◽  
Vol 767 ◽  
pp. 228173
Author(s):  
Albert de Montserrat ◽  
Jason P. Morgan ◽  
Jörg Hasenclever
Keyword(s):  
Large Strain ◽  
Two Dimensional

A three-dimensional numerical model for large strain compression of nanofibrillar cellulose foams

2018 ◽  
Vol 33 (2) ◽  
pp. 256-270
Author(s):  
Prashanth Srinivasa ◽  
Artem Kulachenko
Keyword(s):  
Elastic Modulus ◽  
Large Strain ◽  
Three Dimensional ◽  
Relative Yield ◽  
Strain Response ◽  
Two Dimensional ◽  
Dimensional Model ◽  
Plateau Stress ◽  
Compressive Response ◽  
Nanofibrillar Cellulose

Abstract We investigate the suitability of three-dimensional Voronoi structures in representing a large strain macroscopic compressive response of nanofibrillar cellulose foams and understanding the connection between the features of the response and details of the microstructure. We utilise Lloyd’s algorithm to generate centroidal tessellations to relax the Voronoi structures and have reduced polydispersity. We begin by validating these structures against simulations of structures recreated from microtomography scans. We show that by controlling the cell face curvature, it is possible to match the compressive response for a 96.02 % porous structure. For the structures of higher porosity (98.41 %), the compressive response can only be matched up to strain levels of 0.4 with the densification stresses being overestimated. We then ascertain the representative volume element (RVE) size based on the measures of relative elastic modulus and relative yield strength. The effects of cell face curvature and partially closed cells on the elastic modulus and plateau stress is then estimated. Finally, the large strain response is compared against the two-dimensional Voronoi model and available experimental data for NFC foams. The results show that compared to the two-dimensional model, the three-dimensional analysis provides a stiffer response at a given porosity due to earlier self-contact.

Velocity and Strain Distributions in Two-Dimensional Orthogonal Machining

2004 ◽  
Author(s):  
Seongeyl Lee ◽  
Jihong Hwang ◽  
M. Ravi Shankar ◽  
Srinivasan Chandrasekar ◽  
W. Dale Compton
Keyword(s):  
Strain Rate ◽  
Deformation Zone ◽  
High Speed ◽  
Imaging System ◽  
Large Strain ◽  
Cutting Edge ◽  
Two Dimensional ◽  
Intimate Contact ◽  
Orthogonal Machining ◽  
Strain And Strain Rate

A study has been made of the primary deformation zone and tool-chip interface in two-dimensional (plane strain) orthogonal machining of commercially pure metals. The use of a high-speed, Charge-Coupled Device (CCD) imaging system in conjunction with an optically transparent, sapphire cutting tool, has enabled characteristics of the deformation field such as velocity, strain, and material flow, to be obtained at high spatial and temporal resolution. The velocity distributions in the primary deformation zone and along the tool rake face have been obtained by applying a Particle Image Velocimetry (PIV) technique to sequences of high-speed images of the chip-tool interface taken through the transparent tool, and of the primary deformation zone recorded from a side of the workpiece. A procedure is presented and demonstrated for determining the strain and strain rate distributions in the primary deformation zone. The measurements have provided data about the variations of strain, strain rate and velocity, in and around the cutting edge and primary deformation zone; confirmed the existence of a region of retarded sliding in the region of intimate contact between tool and chip; and highlighted the occurrence of a region of dead metal ahead of the cutting edge when cutting with a negative rake angle tool. The implications of these results to the use of machining as a controlled test for studying very large strain deformation, and for estimating material properties under extreme conditions of deformation are discussed.

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