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Improvement of a Cohesive Zone Model for Fatigue Delamination Rate Simulation

The cohesive zone model (CZM) has found wide acceptance as a tool for the simulation of delamination in composites and debonding in bonded joints and various implementations of the cohesive zone model dedicated to fatigue problems have been proposed in the past decade. In previous works, the authors...

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Detalles Bibliográficos
Autores principales: Pirondi, Alessandro, Moroni, Fabrizio
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6337180/
https://www.ncbi.nlm.nih.gov/pubmed/30621093
http://dx.doi.org/10.3390/ma12010181
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author Pirondi, Alessandro
Moroni, Fabrizio
author_facet Pirondi, Alessandro
Moroni, Fabrizio
author_sort Pirondi, Alessandro
collection PubMed
description The cohesive zone model (CZM) has found wide acceptance as a tool for the simulation of delamination in composites and debonding in bonded joints and various implementations of the cohesive zone model dedicated to fatigue problems have been proposed in the past decade. In previous works, the authors have developed a model based on cohesive zone to simulate the propagation of fatigue defects where damage acts on cohesive stiffness, with an initial (undamaged) stiffness representative of that of the entire thickness of an adhesive layer. In the case of a stiffness that is order of magnitude higher than the previous one (for instance, in the simulation of the ply-to-ply interface in composites), the model prediction becomes inaccurate. In this work, a new formulation of the model that overcomes this limitation is developed. Finite element simulations have been conducted on a mode I, constant bending (constant G)-loaded double cantilever beam (DCB) joint to assess the response of the new model with respect to the original one for varying initial stiffness K(0) and cohesive strength σ(0). The results showed that the modified model is robust with respect to changes of two orders of magnitude in initial stiffness and of a factor of two in σ(0).
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spelling pubmed-63371802019-01-22 Improvement of a Cohesive Zone Model for Fatigue Delamination Rate Simulation Pirondi, Alessandro Moroni, Fabrizio Materials (Basel) Article The cohesive zone model (CZM) has found wide acceptance as a tool for the simulation of delamination in composites and debonding in bonded joints and various implementations of the cohesive zone model dedicated to fatigue problems have been proposed in the past decade. In previous works, the authors have developed a model based on cohesive zone to simulate the propagation of fatigue defects where damage acts on cohesive stiffness, with an initial (undamaged) stiffness representative of that of the entire thickness of an adhesive layer. In the case of a stiffness that is order of magnitude higher than the previous one (for instance, in the simulation of the ply-to-ply interface in composites), the model prediction becomes inaccurate. In this work, a new formulation of the model that overcomes this limitation is developed. Finite element simulations have been conducted on a mode I, constant bending (constant G)-loaded double cantilever beam (DCB) joint to assess the response of the new model with respect to the original one for varying initial stiffness K(0) and cohesive strength σ(0). The results showed that the modified model is robust with respect to changes of two orders of magnitude in initial stiffness and of a factor of two in σ(0). MDPI 2019-01-07 /pmc/articles/PMC6337180/ /pubmed/30621093 http://dx.doi.org/10.3390/ma12010181 Text en © 2019 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Pirondi, Alessandro
Moroni, Fabrizio
Improvement of a Cohesive Zone Model for Fatigue Delamination Rate Simulation
title Improvement of a Cohesive Zone Model for Fatigue Delamination Rate Simulation
title_full Improvement of a Cohesive Zone Model for Fatigue Delamination Rate Simulation
title_fullStr Improvement of a Cohesive Zone Model for Fatigue Delamination Rate Simulation
title_full_unstemmed Improvement of a Cohesive Zone Model for Fatigue Delamination Rate Simulation
title_short Improvement of a Cohesive Zone Model for Fatigue Delamination Rate Simulation
title_sort improvement of a cohesive zone model for fatigue delamination rate simulation
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6337180/
https://www.ncbi.nlm.nih.gov/pubmed/30621093
http://dx.doi.org/10.3390/ma12010181
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