A coupled elastoplastic damage model for semi-brittle material and uncertainty analysis of the material parameters determination
This paper presented a coupled elastoplastic damage model for the semi-brittle material agillites in unsaturated and saturated conditions. The experimental investigation introduced in the first part, shows an important plastic deformation coupled with damage induced. Influence of stress state and water contents on the mechanical behaviour of material is also presented. Base on these experimental results, a new coupled model is proposed for the poromechanical behaviour of this material. The model is formulated under the framework of poroplasticity and continuum damage mechanics. Then it is also extended to unsaturated condition by introducing the concept of plastic effective stress. The approach of determining the models parameters based on the undrained compression experimental data is proposed. In additions, a parametric study is performed in order to illustrate the influence of water saturation degree and stress state. Finally, the comparisons between numerical simulations and test data show that the proposed model is capable to reproduce the main mechanical features of semi-brittle material.
L.CHEN, Y.JIA, J.F.Shao Y.JIA J.F.Shao
Laboratory of Mechanics of LILLE, UMR 8107 CNRS, EUDIL-USTL, Polytech-Lille, Cité Scientifique 59655 Villeneuve d’Ascq, France
国际会议
上海
英文
2007-10-18（万方平台首次上网日期，不代表论文的发表时间）