A critical assessment of nonlocal strain softening methods in biaxial compression

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Title: A critical assessment of nonlocal strain softening methods in biaxial compression
Author(s): Summersgill, FC
Kontoe, S
Potts, D
Item Type: Journal Article
Abstract: When modelling the development of slip surfaces in strain softening soils, the finite element method can suffer from mesh dependency and a lack of convergence of the analysis. The calculation of strains using a nonlocal method avoids the independent softening of a solitary point that can cause these symptoms. Nonlocal methods calculate the strain at a point with reference to the strains at calculation points surrounding it. In this study, a biaxial compression analysis is used to compare the original and two modified nonlocal methods to local strain softening analysis. Three nonlocal parameters are introduced and their influence on the nonlocal strain calculation is investigated. Meshes with different discretisations permit a comparison of the mesh dependency of these methods and a sensitivity analysis of nonlocal parameters. All the nonlocal methods are found to have significantly less mesh dependency than the local method. Both modified nonlocal methods exhibit less mesh dependency than the original approach, but one of the two modified methods, the Over-nonlocal method, is shown to be unstable as the mesh is refined for certain values of the nonlocal parameters.
Publication Date: 16-Jan-2017
Date of Acceptance: 22-Sep-2016
URI: http://hdl.handle.net/10044/1/40740
DOI: https://dx.doi.org/10.1061/(ASCE)GM.1943-5622.0000852
ISSN: 1532-3641
Publisher: American Society of Civil Engineers
Journal / Book Title: International Journal of Geomechanics (ASCE)
Volume: 17
Issue: 7
Copyright Statement: This work is made available under the terms of the Creative Commons Attribution 4.0 International license, http://creativecommons.org/licenses/by/4.0/
Sponsor/Funder: Engineering & Physical Science Research Council (EPSRC)
Engineering & Physical Science Research Council (EPSRC)
Engineering & Physical Science Research Council (EPSRC)
Engineering & Physical Science Research Council (EPSRC)
Engineering & Physical Science Research Council (EPSRC)
DONG Energy Wind Power A/S
Engineering & Physical Science Research Council (E
Technology Strategy Board
Funder's Grant Number: GR/M79462
GR/R67408/01
EP/D505488/1
EP/D506387/1
EP/G063486/1
030-13-0133
BH101595 RES0540/7539
101968
Keywords: Science & Technology
Technology
Engineering, Geological
Engineering
Strain softening
Nonlocal
Finite element
Mesh dependence
Biaxial compression
MODEL
0905 Civil Engineering
General Mathematics
Publication Status: Published
Article Number: 04017006
Open Access location: http://dx.doi.org/10.1061/(ASCE)GM.1943-5622.0000852
Appears in Collections:Faculty of Engineering
Civil and Environmental Engineering



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