Thermal expansion of selected graphite-reinforced polyimide-, epoxy-, and glass-matrix composites

Tompkins, S. S.

doi:10.1007/bf00503228

Cited by 13 publications

(12 citation statements)

References 5 publications

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“…6 ìå/ o C. 13 These values are typically much smaller than those of matrix materials and so are often considered to be insignificant. 7 The longitudinal CTE of carbon-epoxy composites is regularly cited as being negative 14,15 or zero but again is generally considered negligible in comparison with the transverse CTE. 12,[15][16][17][18] For this reason, and to allow parallels to be drawn with uptake-induced swelling, only transverse thermal expansion will be considered.…”

Section: Thermal Effectsmentioning

confidence: 99%

“…7 The longitudinal CTE of carbon-epoxy composites is regularly cited as being negative 14,15 or zero but again is generally considered negligible in comparison with the transverse CTE. 12,[15][16][17][18] For this reason, and to allow parallels to be drawn with uptake-induced swelling, only transverse thermal expansion will be considered. The transverse CTE may exhibit temperature dependency, 7,8,11,19 particularly when exposure temperatures cross the glass transition temperature.…”

Section: Thermal Effectsmentioning

confidence: 99%

“…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%

“…20 However, the variation is sufficiently small over typical in-service conditions for civil engineering structures that an average value is often assumed. 12,15,19,20 A literature survey of experimentally obtained values of transverse CTE for various unidirectional carbon fibre/epoxy products covering fibre volume fractions ranging from 0 . 58 to 0 .…”

Section: Thermal Effectsmentioning

confidence: 99%

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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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Section: Thermal Effectsmentioning

confidence: 99%

Section: Thermal Effectsmentioning

confidence: 99%

“…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%

Section: Thermal Effectsmentioning

confidence: 99%

See 2 more Smart Citations

Uptake swelling and thermal expansion of CFRP tendons

Scott¹,

Lees²

2009

Proceedings of the Institution of Civil Engineers - Structures

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“…The average fiber modulus reported in the literature for (unsized) P75 21,81,84,86–91 and (sized) P75S 92 is E A = 517 GPa. Using the longitudinal modulus E A = 517 GPa and the properties of Epoxy 934 (Table 3), the rest of elastic properties (ET,GA,νA,νT) for P75 fiber are back calculated by minimizing (equation (6)) between unidirectional lamina data (E1 d,E2 d,G12 d,ν12 d) of both P75/934 and P75/1962 available in literature 19,21,81,83,93 and lamina properties (E1,E2,G12,ν12,ν23) predicted using PMM micromechanics. All the properties of P75 are back calculated using data from literature at RT.…”

Section: Constituent Propertiesmentioning

confidence: 99%

Damage initiation and evolution during monotonic cooling of laminated composites

Barbero

2018

Journal of Composite Materials

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The objective of this work is to develop a methodology to predict matrix damage initiation and evolution in laminated composites subjected to monotonic cooling using discrete damage mechanics and a careful characterization of the required temperature-dependent material properties. Since prediction of thermo-mechanical damage requires precise knowledge of the temperature-dependent properties of the material, back-calculation of fiber and matrix properties from different sources is included. The proposed methodology is flexible, in that it can be adapted to the availability of experimental data. A compilation of literature data is developed to estimate the properties of several fiber and matrix systems. Prediction of lamina and laminate temperature-dependent properties are compared with available data. Furthermore, temperature-dependent fracture toughness of four material systems are estimated from available crack density data. For the material systems studied, it is found that temperature-independent fracture toughness is satisfactory for prediction of damage initiation, evolution, and saturation.

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Thermal expansivity

Singh¹

1998

Mechanical and Thermophysical Properties of Polymer Liquid Crystals

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Thermal expansion of selected graphite-reinforced polyimide-, epoxy-, and glass-matrix composites

Cited by 13 publications

References 5 publications

Uptake swelling and thermal expansion of CFRP tendons

Uptake swelling and thermal expansion of CFRP tendons

Damage initiation and evolution during monotonic cooling of laminated composites

Thermal expansivity

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