State parameter for partially drained paths using a SANISAND model
The state parameter is a fundamental component of critical state compatible, bounding surface plasticity models. Several definitions for the state parameter exist, expressing how far the current state is from critical. However, there is rarely the opportunity to directly assess the chosen state para...
| Main Authors: | , |
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| Format: | Journal article |
| Language: | English |
| Published: |
Elsevier
2024
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| _version_ | 1811139344350576640 |
|---|---|
| author | Dilip, A Orestis, A |
| author_facet | Dilip, A Orestis, A |
| author_sort | Dilip, A |
| collection | OXFORD |
| description | The state parameter is a fundamental component of critical state compatible, bounding surface plasticity models. Several definitions for the state parameter exist, expressing how far the current state is from critical. However, there is rarely the opportunity to directly assess the chosen state parameter definition within a given model. Here, we use a plasticity model of the SANISAND family to simulate partially drained paths in triaxial space, by imposing a constant ratio of volumetric to axial strain. We show that for such paths, the locus of post-phase transformation and post-peak stress ratio points where instability is triggered represents a constant state parameter curve in e−p′ space. We then present results from a series of partially drained triaxial compression experiments on Hostun sand, where volumetric and axial strains are coupled. We demonstrate that the chosen constitutive model does not recreate the experimentally observed paths well and more specifically is unable to match the experimentally obtained locus of constant state instability points. Consequently, we propose an updated state parameter definition through which the selected bounding surface plasticity model is shown to not only capture the desired locus of instability points, but to also achieve an overall improved performance in simulating partially drained paths. |
| first_indexed | 2024-09-25T04:04:36Z |
| format | Journal article |
| id | oxford-uuid:0fc426df-ee20-48bf-9ce9-1584b630d4db |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-09-25T04:04:36Z |
| publishDate | 2024 |
| publisher | Elsevier |
| record_format | dspace |
| spelling | oxford-uuid:0fc426df-ee20-48bf-9ce9-1584b630d4db2024-05-21T14:28:03ZState parameter for partially drained paths using a SANISAND modelJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:0fc426df-ee20-48bf-9ce9-1584b630d4dbEnglishSymplectic ElementsElsevier2024Dilip, AOrestis, AThe state parameter is a fundamental component of critical state compatible, bounding surface plasticity models. Several definitions for the state parameter exist, expressing how far the current state is from critical. However, there is rarely the opportunity to directly assess the chosen state parameter definition within a given model. Here, we use a plasticity model of the SANISAND family to simulate partially drained paths in triaxial space, by imposing a constant ratio of volumetric to axial strain. We show that for such paths, the locus of post-phase transformation and post-peak stress ratio points where instability is triggered represents a constant state parameter curve in e−p′ space. We then present results from a series of partially drained triaxial compression experiments on Hostun sand, where volumetric and axial strains are coupled. We demonstrate that the chosen constitutive model does not recreate the experimentally observed paths well and more specifically is unable to match the experimentally obtained locus of constant state instability points. Consequently, we propose an updated state parameter definition through which the selected bounding surface plasticity model is shown to not only capture the desired locus of instability points, but to also achieve an overall improved performance in simulating partially drained paths. |
| spellingShingle | Dilip, A Orestis, A State parameter for partially drained paths using a SANISAND model |
| title | State parameter for partially drained paths using a SANISAND model |
| title_full | State parameter for partially drained paths using a SANISAND model |
| title_fullStr | State parameter for partially drained paths using a SANISAND model |
| title_full_unstemmed | State parameter for partially drained paths using a SANISAND model |
| title_short | State parameter for partially drained paths using a SANISAND model |
| title_sort | state parameter for partially drained paths using a sanisand model |
| work_keys_str_mv | AT dilipa stateparameterforpartiallydrainedpathsusingasanisandmodel AT orestisa stateparameterforpartiallydrainedpathsusingasanisandmodel |