Ageing effect on the tensile behavior of pultruded CFRP rods

Ageing effect on the tensile behavior of pultruded CFRP rods

Pultruded rods of carbon fiber reinforced polymer (CFRP) are excellent alternative materials to steel tendons for the anchoring of deep-sea oil drilling floating platforms. However, the ageing of the rods for use as tension leg in platforms operating in harsh and unusual offshore conditions, and deg...

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Bibliographic Details
Published in:Materials & design Vol. 110; pp. 245 - 254
Main Authors: Silva, Laís Vasconcelos da, Silva, Fernanda Watte da, Tarpani, José Ricardo, Forte, Maria Madalena de Camargo, Amico, Sandro Campos
Format: Journal Article
Language:English
Published: Elsevier Ltd 15-11-2016
Subjects:
Accelerated ageing
Aging
Carbon fiber reinforced plastics
CFRP
Degradation
Distilled water
Failure mechanisms
Mechanical properties
Microstructure
Pultruded rod
Rods
Sea water
Vinyl ester resins
Pultruded rod
Mechanical properties
Accelerated ageing
Microstructure
CFRP
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Summary:Pultruded rods of carbon fiber reinforced polymer (CFRP) are excellent alternative materials to steel tendons for the anchoring of deep-sea oil drilling floating platforms. However, the ageing of the rods for use as tension leg in platforms operating in harsh and unusual offshore conditions, and degradation mechanisms associated with these materials should be investigated. In this work, a systematic study was carried out aiming at evaluating how accelerated ageing affects the performance of pultruded CFRP rods, focusing on microstructure, tensile behavior, and thermal and chemical stability. CRFP rods with epoxy and with vinylester resins were evaluated. Rods were aged in hot distilled water, in hot seawater, and in UV radiation wheatherometer camera. Degradation was more severe in the vinyl-ester rods based on tensile strength and stiffness results. Deterioration of the fiber-matrix interface and consequent fiber debonding was the main failure mechanism. The vinyl-ester rods presented higher water uptake than the epoxy rods in both distilled water and seawater, and lower mechanical strength after exposed in the latter. In general, the epoxy resin CFRP rods were more resistant to the ageing processes evaluated. [Display omitted] •The present investigation has shown encouraging results regarding the use of pultruded rods under severe conditions.•Microscopic analysis was used to identify damage mechanisms under different ageing conditions.•Strength of carbon fiber/epoxy rods was more affected after immersion in seawater, but not with UV radiation.
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ISSN:0264-1275
1873-4197
DOI:10.1016/j.matdes.2016.07.139