The thermal expansion of carbon fibre reinforced plastics

Yates, B.; McCalla, B. A.; Sargent, J. P.; Rogers, K. F.; Phillips, L.N.; Kingston-Lee, D. M.

doi:10.1007/bf00541677

Cited by 26 publications

(3 citation statements)

References 3 publications

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“…This effect has been previously reported for carbon fibre. [23][24][25] The expansion is almost linear with increasing temperature as illustrated in Figure 4. The resistance was too high to register a value in the unreinforced sample.…”

Section: Resultsmentioning

confidence: 82%

Use of carbon fibres for reinforcement of thin geopolymer cement sections

Twomey

Brádaigh

Doyle

et al. 2013

Proceedings of the Institution of Mechanical Engineers, Part L:

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An alkali-activated aluminosilicate geopolymer cement was reinforced with polyether ether ketone-wound carbon fibre layers to improve the mechanical properties of the cement in flexion. Such a material, which is heat resistant and has a low coefficient of thermal expansion, will be of use in the development of out-of-autoclave processing routes for large area composite components. The mechanical and physicochemical properties of both the neat and reinforced cement were examined using Charpy impact and three-point bend testing and Fourier transform infrared spectroscopy. A fivefold improvement in flexural strength was observed for the fibre-reinforced geopolymer samples, while a three-fold improvement was observed in the impact strength. The coefficient of thermal expansion of the composite was determined using dilatometry. A number of different curing cycles were also examined using differential scanning calorimetry. The fibre reinforcement led to flexural strength improvement of up to 5 times as well as increasing the strain to failure.

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Section: Resultsmentioning

confidence: 82%

Use of carbon fibres for reinforcement of thin geopolymer cement sections

Twomey

Brádaigh

Doyle

et al. 2013

Proceedings of the Institution of Mechanical Engineers, Part L:

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“…Assuming carbon fibres, then a,f is very much less than the thermal expansion coefficient of the matrix, am, and it can be set approximately to zero. The temperature variation of the resin expansion coefficient was not measured, but it can be estimated from the work of Yates et al [9] on similar resin systems. The results for the latter suggest that am(T ) "~ [4.39 + 0.018(T-300)] x 10 'K -1…”

Section: Discussionmentioning

confidence: 99%

Residual stresses and the optimum cure cycle for an epoxy resin

et al. 1989

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Residual stresses in carbon fibre-reinforced plastic composites arise because of the large difference in thermal expansion of the fibres and matrix. It has been suggested that these stresses might be reduced in epoxy resin matrices by curing at a lower temperature. Experiments have been made on five curing cycles, to test this possibility and to study the variations of viscosity and volume changes of the resin under different cure conditions. DSC experiments have also been made to determine the degree of cure at various stages of the cycles. It was found that a cycle with the low peak temperature of 1 20 ° C required a prohibitively tong length of time to produce a complete cure. Of the other cycles studied, it is predicted that it would be advantageous, in reducing residual stresses, to use a peak temperature of 160 ° C, rather than 175 ° C, provided that a dwell of 18 min is included at 160°C to ensure a complete cure.

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“…58 to 0 . 65 suggest values between 25 and 47 ìå/ o C. 8,14,15,19,21,22 Regarding guidelines for designers, the ACI Committee 440 23 quotes an envelope encompassing 74 . 0 to 104 .…”

Section: Thermal Effectsmentioning

confidence: 99%

Uptake swelling and thermal expansion of CFRP tendons

Scott¹,

Lees²

2009

Proceedings of the Institution of Civil Engineers - Structures

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Carbon-fibre-reinforced polymer (CFRP) tendons can be used as a corrosion-resistant alternative to steel for reinforcing or prestressing concrete in aggressive marine environments. The design lives of many civil marine structures often span decades and so the long-term durability of the internal reinforcement is important. One significant, yet overlooked, aspect of CFRP tendon durability is its susceptibility to swell on absorption of aqueous solutions including water and salt water. This paper reviews uptake-induced swelling in CFRP materials and draws comparisons with studies of swelling caused by thermal effects. The diffusion of aqueous solutions and their interaction with the polymer matrix are identified as the primary mechanisms responsible for the swelling. Experimental details are presented that correlate the uptake of water and salt water to swelling observed in CFRP tendons. The results are contrasted with both uptake-and thermal-driven behaviour cited in the literature. Lamé 's equations are used to estimate the magnitude of the resulting stresses induced in the surrounding concrete. The practical significance of the findings is discussed, including the potential for cracking in the surrounding concrete cover and the implications for the tendon-concrete bond.

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The thermal expansion of carbon fibre reinforced plastics

Cited by 26 publications

References 3 publications

Use of carbon fibres for reinforcement of thin geopolymer cement sections

Use of carbon fibres for reinforcement of thin geopolymer cement sections

Residual stresses and the optimum cure cycle for an epoxy resin

Uptake swelling and thermal expansion of CFRP tendons

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