The effect of matrix type on ageing of thick vinyl ester glass-fibre-reinforced laminates

Essi Sarlin*, Reija Sironen, Tuomas Pärnänen, Mari Lindgren, Mikko Kanerva, Jyrki Vuorinen

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

8 Citations (Scopus)


In this research, glass fibre reinforced composite laminate samples were manufactured with filament winding technique using four different vinyl ester resin systems to study ageing. The manufactured laminate samples were conditioned in an environmental cabinet (70°C, 95 RH%), water immersion (95°C), and in sulphuric acid solution immersion under pressure (5% H2SO4, 95°C, 15bar). After 6 and 12months of conditioning, the samples were tensile tested and the results were compared with the initial values. Regardless of the matrix type, conditioning in the environmental cabinet resulted in the lowest weight gain and least decrease in tensile properties: the decrease in the tensile strength values was 10-25% after 12months' conditioning depending on the vinyl ester used. The water immersion was more detrimental to the samples than the 5% H2SO4 immersion causing the highest weight gain and the greatest decrease in tensile strength (up to 65%). However, when comparing the tensile performance, it was noted that the highest weight gain did not inevitably correlate with the strongest ageing effect. In water immersion, the ultimate strength deteriorates faster than the proof stress level leading to a decreasing damage tolerance of the vinyl-ester composite laminates.

Original languageEnglish
Pages (from-to)840-850
Number of pages11
JournalComposite Structures
Early online date11 Jan 2017
Publication statusPublished - 15 May 2017
MoE publication typeA1 Journal article-refereed


  • Ageing
  • GFRP
  • Tensile properties
  • Vinyl ester


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