The influence of hardener-to-epoxy ratio on the interfacial strength in glass fibre reinforced epoxy composites

Ross F. Minty, Liu Yang, James L. Thomason

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

This work seeks to develop a better understanding of the influence that the chemistry of an epoxy thermoset system has on the stress-transfer capability of the fibre-matrix interface. We discuss the correlation between the interfacial shear strength (IFSS) and the properties of the matrix such as glass transition temperature (Tg), storage modulus and linear coefficient of thermal expansion (LCTE). The results indicate that each is strongly dependent on the hardener-to-epoxy ratio and it was found that changes in IFSS can be related to changes in the thermomechanical properties of the matrix. From the results presented it is hypothesized that residual radial compressive stresses at the interface are influenced by the chemistry of the matrix system due to the changes in the properties of the matrix. The combination of these residual stresses with static friction may lead to a potential variation of the interfacial stress-transfer capability in glass-fibre reinforced epoxy composites.
LanguageEnglish
JournalComposites Part A: Applied Science and Manufacturing
Early online date30 May 2018
DOIs
Publication statusE-pub ahead of print - 30 May 2018

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Shear strength
Glass fibers
Thermosets
Composite materials
Compressive stress
Thermal expansion
Residual stresses
Elastic moduli
Friction
Fibers
fiberglass
Glass transition temperature

Keywords

  • internal stress
  • interface
  • interphase
  • fibre/matrix bond
  • residual Stress

Cite this

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title = "The influence of hardener-to-epoxy ratio on the interfacial strength in glass fibre reinforced epoxy composites",
abstract = "This work seeks to develop a better understanding of the influence that the chemistry of an epoxy thermoset system has on the stress-transfer capability of the fibre-matrix interface. We discuss the correlation between the interfacial shear strength (IFSS) and the properties of the matrix such as glass transition temperature (Tg), storage modulus and linear coefficient of thermal expansion (LCTE). The results indicate that each is strongly dependent on the hardener-to-epoxy ratio and it was found that changes in IFSS can be related to changes in the thermomechanical properties of the matrix. From the results presented it is hypothesized that residual radial compressive stresses at the interface are influenced by the chemistry of the matrix system due to the changes in the properties of the matrix. The combination of these residual stresses with static friction may lead to a potential variation of the interfacial stress-transfer capability in glass-fibre reinforced epoxy composites.",
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T1 - The influence of hardener-to-epoxy ratio on the interfacial strength in glass fibre reinforced epoxy composites

AU - Minty, Ross F.

AU - Yang, Liu

AU - Thomason, James L.

PY - 2018/5/30

Y1 - 2018/5/30

N2 - This work seeks to develop a better understanding of the influence that the chemistry of an epoxy thermoset system has on the stress-transfer capability of the fibre-matrix interface. We discuss the correlation between the interfacial shear strength (IFSS) and the properties of the matrix such as glass transition temperature (Tg), storage modulus and linear coefficient of thermal expansion (LCTE). The results indicate that each is strongly dependent on the hardener-to-epoxy ratio and it was found that changes in IFSS can be related to changes in the thermomechanical properties of the matrix. From the results presented it is hypothesized that residual radial compressive stresses at the interface are influenced by the chemistry of the matrix system due to the changes in the properties of the matrix. The combination of these residual stresses with static friction may lead to a potential variation of the interfacial stress-transfer capability in glass-fibre reinforced epoxy composites.

AB - This work seeks to develop a better understanding of the influence that the chemistry of an epoxy thermoset system has on the stress-transfer capability of the fibre-matrix interface. We discuss the correlation between the interfacial shear strength (IFSS) and the properties of the matrix such as glass transition temperature (Tg), storage modulus and linear coefficient of thermal expansion (LCTE). The results indicate that each is strongly dependent on the hardener-to-epoxy ratio and it was found that changes in IFSS can be related to changes in the thermomechanical properties of the matrix. From the results presented it is hypothesized that residual radial compressive stresses at the interface are influenced by the chemistry of the matrix system due to the changes in the properties of the matrix. The combination of these residual stresses with static friction may lead to a potential variation of the interfacial stress-transfer capability in glass-fibre reinforced epoxy composites.

KW - internal stress

KW - interface

KW - interphase

KW - fibre/matrix bond

KW - residual Stress

UR - https://www.sciencedirect.com/journal/composites-part-a-applied-science-and-manufacturing

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