Abstract
An elastoplastic constitutive model is proposed for saturated sands in general stress space using the middle surface concept (MSC). In MSC, different features of stress-strain response of a material are divided into different pseudo-yield surfaces. The true-yield surface representing the true response is established by using various links between the yield surfaces. In this MSC sand model, several well-known features of sand response are represented by three different pseudo-yield surfaces, which are developed in a simple and straightforward way. These features include the critical state behaviour, the effects of state parameter, unloading and reloading plastic deformation, the influence of fabric anisotropy, and phase transformation line related behaviour. Finally, the model predictions and test results are compared for two different types of sands under a variety of loading conditions and good comparisons are obtained. The application of MSC to saturated sand modelling shows the versatility of MSC as a general concept for modelling stress-strain response of materials.
| Original language | English |
|---|---|
| Pages (from-to) | 389-412 |
| Number of pages | 24 |
| Journal | International Journal for Numerical and Analytical Methods in Geomechanics |
| Volume | 30 |
| Issue number | 5 |
| DOIs | |
| Publication status | Published - 25 Apr 2006 |
Keywords
- Constitutive models
- Fabric anisotropy
- Middle surface concept
- Pseudo yield surfaces
- Sands
ASJC Scopus subject areas
- Computational Mechanics
- General Materials Science
- Geotechnical Engineering and Engineering Geology
- Mechanics of Materials