Transient moisture distribution and hygrothermal stress analysis of composite laminates using equivalent diffusion methods

Wataru Sarae, Seong Jong Kim, Jae Hyuk Kim, Sung Kyu Ha

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

It often takes several decades to reach moisture equilibrium state in composite laminates. Therefore, hourly varying fluctuating boundary moisture and temperature conditions require several millions of time steps to reach a state of equilibrium. A new transient analysis method is proposed to efficiently solve moisture distribution of composite laminates with rapidly fluctuating moisture and temperature boundary conditions. First, effective constant diffusivity and maximum moisture content were obtained by averaging transient temperature-dependent moisture diffusivity. In this way, a simple analytic solution can be effectively used to determine the transient moisture distribution under hourly fluctuating boundary conditions. Its efficiencies are demonstrated in three different conditions by comparing this method with a conventional finite difference method. Hygrothermal stress and material degradation were consequently discussed to demonstrate that we must avoid a simple knock-down factor or 40% devastating penalty and use more rational simulation and supporting data.

Original languageEnglish
Pages (from-to)2413-2428
Number of pages16
JournalJournal of Composite Materials
Volume44
Issue number20
DOIs
StatePublished - 2010 Sep 1

Fingerprint

Stress analysis
Laminates
Moisture
Composite materials
Boundary conditions
Finite difference method
Transient analysis
Temperature
Degradation

Keywords

  • equivalent moisture diffusion method
  • hygrothermal residual stress
  • master curves
  • transient moisture concentration

Cite this

@article{5e9a3699e2544e37bc1a2ed14f7654fa,
title = "Transient moisture distribution and hygrothermal stress analysis of composite laminates using equivalent diffusion methods",
abstract = "It often takes several decades to reach moisture equilibrium state in composite laminates. Therefore, hourly varying fluctuating boundary moisture and temperature conditions require several millions of time steps to reach a state of equilibrium. A new transient analysis method is proposed to efficiently solve moisture distribution of composite laminates with rapidly fluctuating moisture and temperature boundary conditions. First, effective constant diffusivity and maximum moisture content were obtained by averaging transient temperature-dependent moisture diffusivity. In this way, a simple analytic solution can be effectively used to determine the transient moisture distribution under hourly fluctuating boundary conditions. Its efficiencies are demonstrated in three different conditions by comparing this method with a conventional finite difference method. Hygrothermal stress and material degradation were consequently discussed to demonstrate that we must avoid a simple knock-down factor or 40{\%} devastating penalty and use more rational simulation and supporting data.",
keywords = "equivalent moisture diffusion method, hygrothermal residual stress, master curves, transient moisture concentration",
author = "Wataru Sarae and Kim, {Seong Jong} and Kim, {Jae Hyuk} and Ha, {Sung Kyu}",
year = "2010",
month = "9",
day = "1",
doi = "10.1177/0021998310372724",
language = "English",
volume = "44",
pages = "2413--2428",
journal = "Journal of Composite Materials",
issn = "0021-9983",
number = "20",

}

Transient moisture distribution and hygrothermal stress analysis of composite laminates using equivalent diffusion methods. / Sarae, Wataru; Kim, Seong Jong; Kim, Jae Hyuk; Ha, Sung Kyu.

In: Journal of Composite Materials, Vol. 44, No. 20, 01.09.2010, p. 2413-2428.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Transient moisture distribution and hygrothermal stress analysis of composite laminates using equivalent diffusion methods

AU - Sarae, Wataru

AU - Kim, Seong Jong

AU - Kim, Jae Hyuk

AU - Ha, Sung Kyu

PY - 2010/9/1

Y1 - 2010/9/1

N2 - It often takes several decades to reach moisture equilibrium state in composite laminates. Therefore, hourly varying fluctuating boundary moisture and temperature conditions require several millions of time steps to reach a state of equilibrium. A new transient analysis method is proposed to efficiently solve moisture distribution of composite laminates with rapidly fluctuating moisture and temperature boundary conditions. First, effective constant diffusivity and maximum moisture content were obtained by averaging transient temperature-dependent moisture diffusivity. In this way, a simple analytic solution can be effectively used to determine the transient moisture distribution under hourly fluctuating boundary conditions. Its efficiencies are demonstrated in three different conditions by comparing this method with a conventional finite difference method. Hygrothermal stress and material degradation were consequently discussed to demonstrate that we must avoid a simple knock-down factor or 40% devastating penalty and use more rational simulation and supporting data.

AB - It often takes several decades to reach moisture equilibrium state in composite laminates. Therefore, hourly varying fluctuating boundary moisture and temperature conditions require several millions of time steps to reach a state of equilibrium. A new transient analysis method is proposed to efficiently solve moisture distribution of composite laminates with rapidly fluctuating moisture and temperature boundary conditions. First, effective constant diffusivity and maximum moisture content were obtained by averaging transient temperature-dependent moisture diffusivity. In this way, a simple analytic solution can be effectively used to determine the transient moisture distribution under hourly fluctuating boundary conditions. Its efficiencies are demonstrated in three different conditions by comparing this method with a conventional finite difference method. Hygrothermal stress and material degradation were consequently discussed to demonstrate that we must avoid a simple knock-down factor or 40% devastating penalty and use more rational simulation and supporting data.

KW - equivalent moisture diffusion method

KW - hygrothermal residual stress

KW - master curves

KW - transient moisture concentration

UR - http://www.scopus.com/inward/record.url?scp=77957082485&partnerID=8YFLogxK

U2 - 10.1177/0021998310372724

DO - 10.1177/0021998310372724

M3 - Article

AN - SCOPUS:77957082485

VL - 44

SP - 2413

EP - 2428

JO - Journal of Composite Materials

JF - Journal of Composite Materials

SN - 0021-9983

IS - 20

ER -