Cohesive zone model and bipotential formulation: application to a pile/soil interface

Nazihe Terfaya (1) , Michel Raous (1) , Abdelmadjid Berga (2)

1 LMA - Laboratoire de Mécanique et d'Acoustique [Marseille]
2 FIabilité des MAtériaux et des Structures en régions sahariennes (FIMAS).

The cohesive zone model developed by Raous, Cangémi, Cocou and Monerie includes strict unilateral contact to avoid interpenetration, initial adhesion progressively decreasing when the load increases, and Coulomb's friction which is progressively activated when adhesion decreases. Because of its implicit character, the Coulomb friction law is non-associated, and the notion of superpotential with normality rule cannot be used anymore. To overcome this difficulty, G. De Saxcé introduced the class of implicit standard materials based on the concept of bi-potential. In the present work a specific bi-potential adapted to the coupling of unilateral contact, friction and adhesion is constructed, and a numerical solution method is proposed and implemented. An application is presented, for modeling soil/pile interface behavior, on the simulation of pull-out experiments of a pile.

Domaines: Mécanique des structures [physics.class-ph]; Mécanique des structures [physics.class-ph]

Nazihe Terfaya, Michel Raous, Abdelmadjid Berga. Cohesive zone model and bipotential formulation: application to a pile/soil interface. 3rd Euro Mediterranean Symposium on Advances in Geomaterials and Structures 2010, May 2010, Djerba, Tunisia. CD-ROM(6 p.). ⟨hal-00466596⟩