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Influence of specimen type and reinforcement on measured tension-tension fatigue life of unidirectional GFRP laminates

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Influence of specimen type and reinforcement on measured tension-tension fatigue life of unidirectional GFRP laminates. / Korkiakoski, Samuli; Brøndsted, Povl; Sarlin, Essi; Saarela, Olli.

In: International Journal of Fatigue, Vol. 85, 01.04.2016, p. 114-129.

Research output: Contribution to journalArticleScientificpeer-review

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Korkiakoski, Samuli ; Brøndsted, Povl ; Sarlin, Essi ; Saarela, Olli. / Influence of specimen type and reinforcement on measured tension-tension fatigue life of unidirectional GFRP laminates. In: International Journal of Fatigue. 2016 ; Vol. 85. pp. 114-129.

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@article{a8d9081969f241089fd5f61ea7e621f8,
title = "Influence of specimen type and reinforcement on measured tension-tension fatigue life of unidirectional GFRP laminates",
abstract = "It is well known that standardised tension-tension fatigue test specimens of unidirectional (UD) glass-fibre-reinforced plastics (GFRP) laminates tend to fail at end tabs. The true fatigue life is then underestimated. The first objective of this study was to find for UD GFRP laminates a test specimen that fails in the gauge section. The second objective was to compare fatigue performance of two laminates, one having a newly developed UD powder-bound fabric as a reinforcement and the other having a quasi-UD stitched non-crimp fabric as a reinforcement. In the first phase, a rectangular specimen in accordance with the ISO 527-5 standard and two slightly different dog-bone shaped specimens were evaluated by means of finite element modelling. Subsequent comparative fatigue tests were performed for the laminates with the three specimen types. The results showed that the test specimen type has a significant effect on the failure mode and measured fatigue life of the laminates. A significantly higher fatigue life was measured for the laminate with the powder-bound fabric reinforcement when compared to the laminate with the stitched reinforcement.",
keywords = "Fatigue test methods, Polymer matrix composites, S-N curves, Specimen design, Unidirectional laminate",
author = "Samuli Korkiakoski and Povl Br{\o}ndsted and Essi Sarlin and Olli Saarela",
year = "2016",
month = "4",
day = "1",
doi = "10.1016/j.ijfatigue.2015.12.008",
language = "English",
volume = "85",
pages = "114--129",
journal = "International Journal of Fatigue",
issn = "0142-1123",
publisher = "Elsevier",

}

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TY - JOUR

T1 - Influence of specimen type and reinforcement on measured tension-tension fatigue life of unidirectional GFRP laminates

AU - Korkiakoski, Samuli

AU - Brøndsted, Povl

AU - Sarlin, Essi

AU - Saarela, Olli

PY - 2016/4/1

Y1 - 2016/4/1

N2 - It is well known that standardised tension-tension fatigue test specimens of unidirectional (UD) glass-fibre-reinforced plastics (GFRP) laminates tend to fail at end tabs. The true fatigue life is then underestimated. The first objective of this study was to find for UD GFRP laminates a test specimen that fails in the gauge section. The second objective was to compare fatigue performance of two laminates, one having a newly developed UD powder-bound fabric as a reinforcement and the other having a quasi-UD stitched non-crimp fabric as a reinforcement. In the first phase, a rectangular specimen in accordance with the ISO 527-5 standard and two slightly different dog-bone shaped specimens were evaluated by means of finite element modelling. Subsequent comparative fatigue tests were performed for the laminates with the three specimen types. The results showed that the test specimen type has a significant effect on the failure mode and measured fatigue life of the laminates. A significantly higher fatigue life was measured for the laminate with the powder-bound fabric reinforcement when compared to the laminate with the stitched reinforcement.

AB - It is well known that standardised tension-tension fatigue test specimens of unidirectional (UD) glass-fibre-reinforced plastics (GFRP) laminates tend to fail at end tabs. The true fatigue life is then underestimated. The first objective of this study was to find for UD GFRP laminates a test specimen that fails in the gauge section. The second objective was to compare fatigue performance of two laminates, one having a newly developed UD powder-bound fabric as a reinforcement and the other having a quasi-UD stitched non-crimp fabric as a reinforcement. In the first phase, a rectangular specimen in accordance with the ISO 527-5 standard and two slightly different dog-bone shaped specimens were evaluated by means of finite element modelling. Subsequent comparative fatigue tests were performed for the laminates with the three specimen types. The results showed that the test specimen type has a significant effect on the failure mode and measured fatigue life of the laminates. A significantly higher fatigue life was measured for the laminate with the powder-bound fabric reinforcement when compared to the laminate with the stitched reinforcement.

KW - Fatigue test methods

KW - Polymer matrix composites

KW - S-N curves

KW - Specimen design

KW - Unidirectional laminate

U2 - 10.1016/j.ijfatigue.2015.12.008

DO - 10.1016/j.ijfatigue.2015.12.008

M3 - Article

VL - 85

SP - 114

EP - 129

JO - International Journal of Fatigue

JF - International Journal of Fatigue

SN - 0142-1123

ER -