Advanced

Characteristic state plasticity for granular materials Part II: Model calibration and results

Ahadi, Aylin LU and Krenk, Steen (2000) In International Journal of Solids and Structures 37(43). p.6361-6380
Abstract
A non-associated plasticity theory for granular materials has been developed in Part 1 based on the concept of a characteristic stress state of vanishing incremental dilation. The model is fully three-dimensional and is defined by six material parameters: two for elastic stiffness, one for plastic stiffness, two for the shapes of yield and plastic potential surfaces and one for the dilation at failure. In this paper a calibration procedure is developed using test data only from a standard triaxial test. It is found that the shape parameter for the yield surface can be estimated from the plastic how parameters, thus reducing the number of free parameters to five. Calibration examples are shown, as well as predictions made, for different... (More)
A non-associated plasticity theory for granular materials has been developed in Part 1 based on the concept of a characteristic stress state of vanishing incremental dilation. The model is fully three-dimensional and is defined by six material parameters: two for elastic stiffness, one for plastic stiffness, two for the shapes of yield and plastic potential surfaces and one for the dilation at failure. In this paper a calibration procedure is developed using test data only from a standard triaxial test. It is found that the shape parameter for the yield surface can be estimated from the plastic how parameters, thus reducing the number of free parameters to five. Calibration examples are shown, as well as predictions made, for different confining stress levels and constant volume tests on sand. The model is found to represent stress-strain behaviour and development of volumetric strain in standard triaxial tests well. The model provides good predictions of constant volume behaviour of dense as well as loose sand on the basis of calibration by standard triaxial test data. A simple explicit formula is derived for the failure asymptote in constant volume testing, enabling explicit adjustment of the parameters, if incompressible-test data is available. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
soil mechanics, granular materials, plasticity
in
International Journal of Solids and Structures
volume
37
issue
43
pages
6361 - 6380
publisher
Elsevier
external identifiers
  • scopus:0033861986
ISSN
0020-7683
language
English
LU publication?
yes
id
312acee4-ef2b-41b8-8e2b-aa1ce24bfa07 (old id 589512)
date added to LUP
2008-02-13 10:41:37
date last changed
2017-01-01 07:18:00
@article{312acee4-ef2b-41b8-8e2b-aa1ce24bfa07,
  abstract     = {A non-associated plasticity theory for granular materials has been developed in Part 1 based on the concept of a characteristic stress state of vanishing incremental dilation. The model is fully three-dimensional and is defined by six material parameters: two for elastic stiffness, one for plastic stiffness, two for the shapes of yield and plastic potential surfaces and one for the dilation at failure. In this paper a calibration procedure is developed using test data only from a standard triaxial test. It is found that the shape parameter for the yield surface can be estimated from the plastic how parameters, thus reducing the number of free parameters to five. Calibration examples are shown, as well as predictions made, for different confining stress levels and constant volume tests on sand. The model is found to represent stress-strain behaviour and development of volumetric strain in standard triaxial tests well. The model provides good predictions of constant volume behaviour of dense as well as loose sand on the basis of calibration by standard triaxial test data. A simple explicit formula is derived for the failure asymptote in constant volume testing, enabling explicit adjustment of the parameters, if incompressible-test data is available.},
  author       = {Ahadi, Aylin and Krenk, Steen},
  issn         = {0020-7683},
  keyword      = {soil mechanics,granular materials,plasticity},
  language     = {eng},
  number       = {43},
  pages        = {6361--6380},
  publisher    = {Elsevier},
  series       = {International Journal of Solids and Structures},
  title        = {Characteristic state plasticity for granular materials Part II: Model calibration and results},
  volume       = {37},
  year         = {2000},
}