Thermal cycling effects on the durability of a pultruded GFRP material for off-shore civil engineering structures

Sotirios Grammatikos, Ryan G. Jones, Mark Evernden, Joao Correia

Research output: Contribution to journalArticle

11 Citations (Scopus)
62 Downloads (Pure)

Abstract

This paper investigates the effects of thermal cycles on the structural integrity of a pultruded Glass Fibre Reinforced
Polymer (GFRP). Through a critical review of current literature alongside a comprehensive experimental campaign,
the material’s response to cyclic thermal loading has been ascertained, defined by the rate of degradation of its
physical, mechanical and visco-elastic properties. Matching sets of both dry and soaked samples conditioned in
distilled water for 224 days. Freeze-thaw cycling of both dry and soaked samples was conducted between 20oC and
-10oC for a total of 300 cycles. Computed tomography scanning (CT-scan) was undertaken to assess the
microstructural physical changes throughout freeze-thaw cycling. After exposure, GFRP samples exhibited a minor
decrease in Glass Transition Temperature (Tg) which indicated minor structural degradation. Dry GFRP sample’s
mechanical response exhibited negligible changes in both tensile and in-plane shear properties. However, as a result
of the higher induced thermal stresses, soaked samples showed a significant degradation of their tensile and shear
strengths. Yet, the soaked material’s stiffness remained largely unaffected due to the potential reversible nature of
plasticization, which acts to increase the material’s molecular mobility when initially moisture-saturated, but is later
recovered as the soaked samples lose moisture throughout freeze-thaw cycling.
Original languageEnglish
Pages (from-to)297-310
JournalComposite Structures
Volume153
DOIs
Publication statusPublished - 1 Oct 2016

Fingerprint

Thermal cycling
Civil engineering
Glass fibers
Polymers
Durability
Degradation
Moisture
Structural integrity
Thermal stress
Shear strength
Tomography
Stiffness
Scanning
Water
fiberglass
Hot Temperature

Keywords

  • pultruded composite; polymer matrix composite; FRP; freeze-thaw thermal cycling; mechanical properties; Computed Tomography (CT-scan)

Cite this

Thermal cycling effects on the durability of a pultruded GFRP material for off-shore civil engineering structures. / Grammatikos, Sotirios; Jones, Ryan G.; Evernden, Mark; Correia, Joao.

In: Composite Structures, Vol. 153, 01.10.2016, p. 297-310.

Research output: Contribution to journalArticle

@article{d69894682ab94818a283319eb462c356,
title = "Thermal cycling effects on the durability of a pultruded GFRP material for off-shore civil engineering structures",
abstract = "This paper investigates the effects of thermal cycles on the structural integrity of a pultruded Glass Fibre ReinforcedPolymer (GFRP). Through a critical review of current literature alongside a comprehensive experimental campaign,the material’s response to cyclic thermal loading has been ascertained, defined by the rate of degradation of itsphysical, mechanical and visco-elastic properties. Matching sets of both dry and soaked samples conditioned indistilled water for 224 days. Freeze-thaw cycling of both dry and soaked samples was conducted between 20oC and-10oC for a total of 300 cycles. Computed tomography scanning (CT-scan) was undertaken to assess themicrostructural physical changes throughout freeze-thaw cycling. After exposure, GFRP samples exhibited a minordecrease in Glass Transition Temperature (Tg) which indicated minor structural degradation. Dry GFRP sample’smechanical response exhibited negligible changes in both tensile and in-plane shear properties. However, as a resultof the higher induced thermal stresses, soaked samples showed a significant degradation of their tensile and shearstrengths. Yet, the soaked material’s stiffness remained largely unaffected due to the potential reversible nature ofplasticization, which acts to increase the material’s molecular mobility when initially moisture-saturated, but is laterrecovered as the soaked samples lose moisture throughout freeze-thaw cycling.",
keywords = "pultruded composite; polymer matrix composite; FRP; freeze-thaw thermal cycling; mechanical properties; Computed Tomography (CT-scan)",
author = "Sotirios Grammatikos and Jones, {Ryan G.} and Mark Evernden and Joao Correia",
year = "2016",
month = "10",
day = "1",
doi = "10.1016/j.compstruct.2016.05.085",
language = "English",
volume = "153",
pages = "297--310",
journal = "Composite Structures",
issn = "0263-8223",
publisher = "Elsevier Masson",

}

TY - JOUR

T1 - Thermal cycling effects on the durability of a pultruded GFRP material for off-shore civil engineering structures

AU - Grammatikos, Sotirios

AU - Jones, Ryan G.

AU - Evernden, Mark

AU - Correia, Joao

PY - 2016/10/1

Y1 - 2016/10/1

N2 - This paper investigates the effects of thermal cycles on the structural integrity of a pultruded Glass Fibre ReinforcedPolymer (GFRP). Through a critical review of current literature alongside a comprehensive experimental campaign,the material’s response to cyclic thermal loading has been ascertained, defined by the rate of degradation of itsphysical, mechanical and visco-elastic properties. Matching sets of both dry and soaked samples conditioned indistilled water for 224 days. Freeze-thaw cycling of both dry and soaked samples was conducted between 20oC and-10oC for a total of 300 cycles. Computed tomography scanning (CT-scan) was undertaken to assess themicrostructural physical changes throughout freeze-thaw cycling. After exposure, GFRP samples exhibited a minordecrease in Glass Transition Temperature (Tg) which indicated minor structural degradation. Dry GFRP sample’smechanical response exhibited negligible changes in both tensile and in-plane shear properties. However, as a resultof the higher induced thermal stresses, soaked samples showed a significant degradation of their tensile and shearstrengths. Yet, the soaked material’s stiffness remained largely unaffected due to the potential reversible nature ofplasticization, which acts to increase the material’s molecular mobility when initially moisture-saturated, but is laterrecovered as the soaked samples lose moisture throughout freeze-thaw cycling.

AB - This paper investigates the effects of thermal cycles on the structural integrity of a pultruded Glass Fibre ReinforcedPolymer (GFRP). Through a critical review of current literature alongside a comprehensive experimental campaign,the material’s response to cyclic thermal loading has been ascertained, defined by the rate of degradation of itsphysical, mechanical and visco-elastic properties. Matching sets of both dry and soaked samples conditioned indistilled water for 224 days. Freeze-thaw cycling of both dry and soaked samples was conducted between 20oC and-10oC for a total of 300 cycles. Computed tomography scanning (CT-scan) was undertaken to assess themicrostructural physical changes throughout freeze-thaw cycling. After exposure, GFRP samples exhibited a minordecrease in Glass Transition Temperature (Tg) which indicated minor structural degradation. Dry GFRP sample’smechanical response exhibited negligible changes in both tensile and in-plane shear properties. However, as a resultof the higher induced thermal stresses, soaked samples showed a significant degradation of their tensile and shearstrengths. Yet, the soaked material’s stiffness remained largely unaffected due to the potential reversible nature ofplasticization, which acts to increase the material’s molecular mobility when initially moisture-saturated, but is laterrecovered as the soaked samples lose moisture throughout freeze-thaw cycling.

KW - pultruded composite; polymer matrix composite; FRP; freeze-thaw thermal cycling; mechanical properties; Computed Tomography (CT-scan)

UR - http://dx.doi.org/10.1016/j.compstruct.2016.05.085

UR - http://dx.doi.org/10.1016/j.compstruct.2016.05.085

U2 - 10.1016/j.compstruct.2016.05.085

DO - 10.1016/j.compstruct.2016.05.085

M3 - Article

VL - 153

SP - 297

EP - 310

JO - Composite Structures

JF - Composite Structures

SN - 0263-8223

ER -