NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
An Interface Damage Model for the Simulation of Delamination Under Variable-Mode Ratio in Composite MaterialsA 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 (DM). The constitutive equations that result from the variation of the free energy with damage are 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. Interfacial penetration of two adjacent layers after complete decohesion is prevented by the formulation of the free energy. The model is implemented into the commercial finite element code ABAQUS by means of a user-written decohesion element. Finally, the numerical predictions given by the model are compared with experimental results.
Document ID
20040171493
Document Type
Technical Memorandum (TM)
Authors
Turon, Albert (Girona Univ. Girona, Spain)
Camanho, Pedro P. (Porto Univ. Portugal)
Costa, Josep (Girona Univ. Girona, Spain)
Davila, Carlos G. (NASA Langley Research Center Hampton, VA, United States)
Date Acquired
September 7, 2013
Publication Date
October 1, 2004
Subject Category
Composite Materials
Report/Patent Number
NASA/TM-2004-213277
L-19060
Funding Number(s)
CONTRACT_GRANT: BR01/09
OTHER: 719-20-40-10
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

Available Downloads

NameType 20040171493.pdf STI