Residual stresses created during curing of a polymer matrix composite using a viscoelastic model

Jiang Tao Zhang; Mei Zhang; Shu-Xin Li; Martyn J Pavier; David J Smith

doi:10.1016/j.compscitech.2016.05.002

Residual stresses created during curing of a polymer matrix composite using a viscoelastic model

Jiang Tao Zhang^*, Mei Zhang, Shu-Xin Li, Martyn J Pavier, David J Smith

^*Corresponding author for this work

Research output: Contribution to journal › Article (Academic Journal) › peer-review

30 Citations (Scopus)

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Abstract

A modified viscoelastic constitutive model is proposed to predict cure-induced residual stresses in polymer matrix composites. The modifications rely on using the inverse of the Deborah number to describe regimes corresponding to a fully relaxed state, a viscoelastic state and an elastic state. The composite is only in a viscoelastic state for limited ranges of the Deborah number. By considering the
evolution of the Deborah number during curing of the AS4/3501-6 composite, the composite is in a fully relaxed state when it is cured at high temperature and the degree of cure is lower than 0.73, and no further changes in the viscoelastic characteristics when the degree of cure is higher than 0.8. A 3D simulation of a composite laminate plate is used to predict the evolution of the residual stresses. The analysis reveals that the accurate simulation on the cure-induced residual stress should include the last two states of the entire cure process, and consider the stress relaxation, thermal deformation and chemical shrinkage.

Original language	English
Pages (from-to)	20-27
Number of pages	8
Journal	Composites Science and Technology
Volume	130
Early online date	4 May 2016
DOIs	https://doi.org/10.1016/j.compscitech.2016.05.002
Publication status	Published - 17 Jun 2016

Keywords

Curing
Finite element analysis(FEA)
Polymer-matrix composites (PMCs)
Residual stress
Stress relaxation
Viscoelastic constitutive model

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10.1016/j.compscitech.2016.05.002

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This is the author accepted manuscript (AAM). The final published version (version of record) is available online via Elsevier at doi:10.1016/j.compscitech.2016.05.002. Please refer to any applicable terms of use of the publisher.
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Professor Martyn J Pavier
- Martyn.Pavier@bristol.ac.uk
- Department of Mechanical Engineering - Professor in Mechanics of Materials
- Solid Mechanics
Person: Academic , Member

Cite this

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title = "Residual stresses created during curing of a polymer matrix composite using a viscoelastic model",

abstract = "A modified viscoelastic constitutive model is proposed to predict cure-induced residual stresses in polymer matrix composites. The modifications rely on using the inverse of the Deborah number to describe regimes corresponding to a fully relaxed state, a viscoelastic state and an elastic state. The composite is only in a viscoelastic state for limited ranges of the Deborah number. By considering theevolution of the Deborah number during curing of the AS4/3501-6 composite, the composite is in a fully relaxed state when it is cured at high temperature and the degree of cure is lower than 0.73, and no further changes in the viscoelastic characteristics when the degree of cure is higher than 0.8. A 3D simulation of a composite laminate plate is used to predict the evolution of the residual stresses. The analysis reveals that the accurate simulation on the cure-induced residual stress should include the last two states of the entire cure process, and consider the stress relaxation, thermal deformation and chemical shrinkage.",

keywords = "Curing, Finite element analysis(FEA), Polymer-matrix composites (PMCs), Residual stress, Stress relaxation, Viscoelastic constitutive model",

author = "Zhang, {Jiang Tao} and Mei Zhang and Shu-Xin Li and Pavier, {Martyn J} and Smith, {David J}",

year = "2016",

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doi = "10.1016/j.compscitech.2016.05.002",

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T1 - Residual stresses created during curing of a polymer matrix composite using a viscoelastic model

AU - Zhang, Jiang Tao

AU - Zhang, Mei

AU - Li, Shu-Xin

AU - Pavier, Martyn J

AU - Smith, David J

PY - 2016/6/17

Y1 - 2016/6/17

N2 - A modified viscoelastic constitutive model is proposed to predict cure-induced residual stresses in polymer matrix composites. The modifications rely on using the inverse of the Deborah number to describe regimes corresponding to a fully relaxed state, a viscoelastic state and an elastic state. The composite is only in a viscoelastic state for limited ranges of the Deborah number. By considering theevolution of the Deborah number during curing of the AS4/3501-6 composite, the composite is in a fully relaxed state when it is cured at high temperature and the degree of cure is lower than 0.73, and no further changes in the viscoelastic characteristics when the degree of cure is higher than 0.8. A 3D simulation of a composite laminate plate is used to predict the evolution of the residual stresses. The analysis reveals that the accurate simulation on the cure-induced residual stress should include the last two states of the entire cure process, and consider the stress relaxation, thermal deformation and chemical shrinkage.

AB - A modified viscoelastic constitutive model is proposed to predict cure-induced residual stresses in polymer matrix composites. The modifications rely on using the inverse of the Deborah number to describe regimes corresponding to a fully relaxed state, a viscoelastic state and an elastic state. The composite is only in a viscoelastic state for limited ranges of the Deborah number. By considering theevolution of the Deborah number during curing of the AS4/3501-6 composite, the composite is in a fully relaxed state when it is cured at high temperature and the degree of cure is lower than 0.73, and no further changes in the viscoelastic characteristics when the degree of cure is higher than 0.8. A 3D simulation of a composite laminate plate is used to predict the evolution of the residual stresses. The analysis reveals that the accurate simulation on the cure-induced residual stress should include the last two states of the entire cure process, and consider the stress relaxation, thermal deformation and chemical shrinkage.

KW - Curing

KW - Finite element analysis(FEA)

KW - Polymer-matrix composites (PMCs)

KW - Residual stress

KW - Stress relaxation

KW - Viscoelastic constitutive model

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SP - 20

EP - 27

JO - Composites Science and Technology

JF - Composites Science and Technology

SN - 0266-3538

ER -

Residual stresses created during curing of a polymer matrix composite using a viscoelastic model

Abstract

Keywords

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Professor Martyn J Pavier

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