A new cohesive-zone model is presented based on the combination of an elastic-damage formulation, which simulates the interface decohesion, and a friction contact model. The classical mesomechanic assumption is made whereby a representative area of the interface can be additively decomposed into an undamaged part and a damaged part, so that the ratio between the damaged part and the total area represents a damage parameter ranging from 0 to 1. The main idea consists of adding a Coulomb-like friction term for the stress only on the damaged part of the interface, while the decohesion model takes into account mixed-mode fracture and specializes to piecewise linear interface laws for pure-mode problems. Numerical results are presented for the simulation of a benchmark test for the analysis of concrete dams, in which the proposed model is used to simulate the behaviour of the soil-concrete interface at the base of the dam.
[1]
Giuseppe Cocchetti,et al.
Direct assessment of structural resistance against pressurized fracture
,
2003
.
[2]
Giulio Maier,et al.
Piecewise Linear Models for Interfaces and Mixed Mode Cohesive Cracks
,
2002
.
[3]
M. Crisfield,et al.
Finite element interface models for the delamination analysis of laminated composites: mechanical and computational issues
,
2001
.
[4]
M. A. Crisfield,et al.
Progressive Delamination Using Interface Elements
,
1998
.
[5]
Giulio Alfano,et al.
Influence of water pressure on crack propagation in concrete dams
,
2004
.