Bounding Cam Clay: Difference between revisions
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==Notes== | ==Notes== | ||
This nDMaterial object provides the bounding surface plasticity model of Borja et al. (2001) in which the bounding surface model is represented using modified Cam-Clay theory ( | This nDMaterial object provides the bounding surface plasticity model of Borja et al. (2001) in which the bounding surface model is represented using modified Cam-Clay theory (Schofield and Wroth 1968). In addition to the standard capabilities of the Cam-Clay family of models (e.g., pressure dependence, hardening with plastic volumetric contraction, softening with plastic dilation, and coupled deviatoric and volumetric plastic deformation), the Borja et al. (2001) model has been enhanced to include an anisotropic bounding surface formulation that allows for consideration of hysteretic behaviour under cyclic loading. This bounding surface Cam-Clay model is coupled with a nonlinear hyperelastic model that considered pressure-dependency in the bulk and shear modulus. The full theory of this model is discussed in great detail in Borja et al. (2001), and the essential ideas are summarized in the theory section of this article. | ||
(e.g., pressure dependence, hardening with plastic volumetric contraction, softening with plastic dilation, and coupled deviatoric and volumetric plastic deformation), the Borja et al. (2001) model has been enhanced to include an anisotropic bounding surface formulation that allows for consideration of hysteretic behaviour under cyclic loading. This bounding surface Cam-Clay model is coupled with a nonlinear hyperelastic model that considered pressure-dependency in the bulk and shear modulus. The full theory of this model is discussed in great detail in Borja et al. (2001), and the essential ideas are summarized in the theory section of this article. | |||
===Usage Examples=== | ===Usage Examples=== | ||
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===References=== | ===References=== | ||
Borja, R.I., Lin, C.-H., and Montans, F.J. (2001) 'Cam-Clay plasticity, Part IV: Implicit integration of anisotropic bounding surface model with nonlinear hyperelasticity and ellipsoidal loading function' ''Computer Methods in Applied Mechanics and Engineering | Borja, R.I., Lin, C.-H., and Montans, F.J. (2001) 'Cam-Clay plasticity, Part IV: Implicit integration of anisotropic bounding surface model with nonlinear hyperelasticity and ellipsoidal loading function,' ''Computer Methods in Applied Mechanics and Engineering,'' 190(26), 3293-3323, doi: 10.1016/S0045-7825(00)00301-7. | ||
Schofield, A. and Wroth, P. (1968) ''Critical State Soil Mechanics,'' McGraw Hill, New York. | |||
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Revision as of 01:36, 24 May 2016
- Command_Manual
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This command is used to construct a multi-dimensional bounding surface Cam Clay material object after Borja et al. (2001).
| nDMaterial BoundingCamClay $matTag $massDensity $C $bulkMod $OCR $mu_o $alpha $lambda $h $m |
| $matTag | integer tag identifying material |
| $massDensity | mass density |
| $C | ellipsoidal axis ratio |
| $bulkMod | initial bulk modulus |
| $OCR | overconsolidation ratio |
| $mu_o | elastic shear modulus |
| $alpha | pressure-dependent parameter |
| $lambda | soil compressibility index for virgin loading |
| $h | hardening parameter |
| $m | hardening parameter |
The material formulations for the BoundingCamClay object are "ThreeDimensional" and "PlaneStrain"
Code Developed by Chris McGann & Pedro Arduino, at the University of Washington
Notes
This nDMaterial object provides the bounding surface plasticity model of Borja et al. (2001) in which the bounding surface model is represented using modified Cam-Clay theory (Schofield and Wroth 1968). In addition to the standard capabilities of the Cam-Clay family of models (e.g., pressure dependence, hardening with plastic volumetric contraction, softening with plastic dilation, and coupled deviatoric and volumetric plastic deformation), the Borja et al. (2001) model has been enhanced to include an anisotropic bounding surface formulation that allows for consideration of hysteretic behaviour under cyclic loading. This bounding surface Cam-Clay model is coupled with a nonlinear hyperelastic model that considered pressure-dependency in the bulk and shear modulus. The full theory of this model is discussed in great detail in Borja et al. (2001), and the essential ideas are summarized in the theory section of this article.
Usage Examples
References
Borja, R.I., Lin, C.-H., and Montans, F.J. (2001) 'Cam-Clay plasticity, Part IV: Implicit integration of anisotropic bounding surface model with nonlinear hyperelasticity and ellipsoidal loading function,' Computer Methods in Applied Mechanics and Engineering, 190(26), 3293-3323, doi: 10.1016/S0045-7825(00)00301-7.
Schofield, A. and Wroth, P. (1968) Critical State Soil Mechanics, McGraw Hill, New York.
Theory
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