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A Thermodynamically Consistent Damage Model for Advanced Composites

A continuum damage model for the prediction of damage onset and structural collapse of structures manufactured in fiber-reinforced plastic laminates is proposed. The principal damage mechanisms occurring in the longitudinal and transverse directions of a ply are represented by a damage tensor that is fixed in space. Crack closure under load reversal effects are taken into account using damage variables established as a function of the sign of the components of the stress tensor. Damage activation functions based on the LaRC04 failure criteria are used to predict the different damage mechanisms occurring at the ply level. The constitutive damage model is implemented in a finite element code. The objectivity of the numerical model is assured by regularizing the dissipated energy at a material point using Bazant’s Crack Band Model. To verify the accuracy of the approach, analyses ofcoupon specimens were performed, and the numerical predictions were compared with experimental data

NASA/TM-2006-214282

National Aeronautics and Space Administration

Autor: Maimí Vert, Pere
Camanho, Pedro Manuel Ponces Rodrigues de Castro
Mayugo Majó, Joan Andreu
Dávila, Carlos G.
Resum: A continuum damage model for the prediction of damage onset and structural collapse of structures manufactured in fiber-reinforced plastic laminates is proposed. The principal damage mechanisms occurring in the longitudinal and transverse directions of a ply are represented by a damage tensor that is fixed in space. Crack closure under load reversal effects are taken into account using damage variables established as a function of the sign of the components of the stress tensor. Damage activation functions based on the LaRC04 failure criteria are used to predict the different damage mechanisms occurring at the ply level. The constitutive damage model is implemented in a finite element code. The objectivity of the numerical model is assured by regularizing the dissipated energy at a material point using Bazant’s Crack Band Model. To verify the accuracy of the approach, analyses ofcoupon specimens were performed, and the numerical predictions were compared with experimental data
NASA/TM-2006-214282
Accés al document: http://hdl.handle.net/2072/212062
Llenguatge: eng
Editor: National Aeronautics and Space Administration
Drets: Tots els drets reservats
Matèria: Mecànica de fractura
Fracture mechanics
Materials compostos -- Fatiga
Composite materials -- Fatigue
Assaigs de materials
Materials -- Testing
Títol: A Thermodynamically Consistent Damage Model for Advanced Composites
Tipus: info:eu-repo/semantics/article
Repositori: Recercat

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