.. _R7.01.14:

**r7.01.14** Law of Behaviour CAM_CLAY
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**Summary:**


.. _OLE_LINK2:

The Cam-Clay model is one of the best known and most used elastoplastic models in soil mechanics. It is specially adapted to clay materials. There are several types of Cam-Clay models, the one shown here is the most common and is called modified Cam-Clay. This model is characterized by collapsible load surfaces in the form of ellipses in the diagram of the first two stress invariants. Within these reversibility surfaces, the material is non-linear elastic. In addition, at one point of each ellipse, there is a critical state characterized by zero volume variation. All of these points constitute a line separating the zones of expansion and contraction of the material as well as the zones of negative and positive work hardening. Work hardening is governed by a single scalar variable and the normal flow rule is adopted.




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    Notations
    Introduction
    Loi_de_Cam_Clay_modifi_e
    Int_gration_num_rique_des_relations_de_comportement
    Op_rateur_tangent
    Param_tres_mat_riaux_et_variables_internes_
    Mise_en__uvre_d_un_calcul_avec_la_loi_CAM_CLAY
    Annexe___Op_rateur_tangent_en_implicite__Option_FULL_MECA
    Bibliographie
    V_rification
    Description_des_versions_du_document