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An Interface Damage Model for the Simulation of Delamination Under Variable-Mode Ratio in Composite Materials

A thermodynamically consistent damage model for the simulation of progressive delamination under variable mode ratio is presented. The model is formulated in the context of the Damage Mechanics. The constitutive equation that results from the definition of the free energy as a function of a damage variable is used to model the initiation and propagation of delamination. A new delamination initiation criterion is developed to assure that the formulation can account for changes in the loading mode in a thermodynamically consistent way. The formulation proposed accounts for crack closure effets avoiding interfacial penetration of two adjacent layers after complete decohesion. The model is implemented in a finite element formulation. The numerical predictions given by the model are compared with experimental results

National Aeronautics and Space Administration

Author: Turon Travesa, Albert
Camanho, Pedro Manuel Ponces Rodrigues de Castro
Costa i Balanzat, Josep
Dávila, Carlos G.
Date: 2018 June 5
Abstract: A thermodynamically consistent damage model for the simulation of progressive delamination under variable mode ratio is presented. The model is formulated in the context of the Damage Mechanics. The constitutive equation that results from the definition of the free energy as a function of a damage variable is used to model the initiation and propagation of delamination. A new delamination initiation criterion is developed to assure that the formulation can account for changes in the loading mode in a thermodynamically consistent way. The formulation proposed accounts for crack closure effets avoiding interfacial penetration of two adjacent layers after complete decohesion. The model is implemented in a finite element formulation. The numerical predictions given by the model are compared with experimental results
Document access: http://hdl.handle.net/2072/320357
Language: eng
Publisher: National Aeronautics and Space Administration
Rights: Tots els drets reservats
Subject: Materials laminats
Laminated materials
Materials compostos -- Deslaminatge
Composite materials -- Delamination
Materials compostos -- Mètodes de simulació
Composite materials -- Simulation methods
Assaigs de materials
Materials -- Testing
Title: An Interface Damage Model for the Simulation of Delamination Under Variable-Mode Ratio in Composite Materials
Type: info:eu-repo/semantics/article
Repository: Recercat

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