A dielectric study of hydrolytic ageing and the effects of periodic freezing in carbon fibre reinforced plastic jointed structures

McConnell, B.K.; Pethrick, Richard A.

doi:10.1016/j.ijadhadh.2010.01.003

Cited by 8 publications

(9 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For epoxy-based composite, no effect of freezing on the ILSS of moistened specimens was found. McConnell and Pethrick 6 investigated the effect of freezing of epoxy-based carbon fiber reinforced plastic (CFRP) joined structures on their water sorption characteristics. It was found that initial water uptake was greatest in the frozen specimens; however, over time the greater leaching and desorption suffered by frozen joints resulted in a drop in weight relative to non-frozen specimens.…”

Section: Introductionmentioning

confidence: 99%

Mechanical properties of pultruded glass fiber reinforced plastic after freeze–thaw cycling

Анискевич

Korkhov

Faitelsone

et al. 2012

Journal of Reinforced Plastics and Composites

View full text Add to dashboard Cite

The use of pultruded fiber-reinforced plastics in civil infrastructure requires the long-term prediction of their mechanical properties, which should be based on understanding and estimating the processes in the structure under action of aggressive environmental factors: humidity and freeze–thaw cycles. This article reports on results of short-term exposure to severe freeze–thaw cycling in the temperature range from –30°C to 20°C of polyester-based glass fiber reinforced plastic both dry and wet. The effect of freeze–thaw cycling of flat specimens cut from I-beam pultruded profile was estimated by use of three-point-bending tests and dilatometric investigation in the temperature range from 20°C to 125°C. It was found that freeze–thaw cycling results in an increase of flexural modulus and decrease of ultimate strength, and strain. The effect is more pronounced for dry material than of moistened, but it is comparable with the data spread. Linear thermal expansion coefficients in three principal axes of the composite are different: the highest is in transverse to fiber axis out-of-layers plane. The linear thermal expansion coefficients of wet material are higher than of dry. Heating up to 125°C and subsequent cooling results in a residual (shrinking) volume strain. The changes of flexural characteristics, linear thermal expansion coefficients, and shrinking strain after heating–cooling after freeze–thaw cycling are mediated by the change of moisture content in the material specimens.

show abstract

Section: Introductionmentioning

confidence: 99%

Mechanical properties of pultruded glass fiber reinforced plastic after freeze–thaw cycling

Анискевич

Korkhov

Faitelsone

et al. 2012

Journal of Reinforced Plastics and Composites

View full text Add to dashboard Cite

show abstract

“…In an attempt to explore the effects of aircraft flight on the CFRP joints, a study was undertaken in which joints aged at 75 ℃ over a period of 162 weeks in deionised water were regularly exposed to intervals at cryogenic temperatures. 131 During these periods at low temperatures the water in voids will be converted into ice. Water bound to the polymer matrix will not be frozen but will exhibit reduced mobility.…”

Section: Composite Bond Durabilitymentioning

confidence: 99%

Design and ageing of adhesives for structural adhesive bonding – A review

Pethrick

2014

Proceedings of the Institution of Mechanical Engineers, Part L:

View full text Add to dashboard Cite

This review outlines some of the issues which have to be addressed when selecting an adhesive for a particular structural adhesive bonding application. The designer may find that a number of adhesives provide the required load bearing properties and the selection may require a more detailed consideration of the processes involved in the fabrication of the joint, the temperature over which it is to work and the environment in which it will have to operate. The article attempts to provide the reader with an insight into the effects of factors such as time and temperature used in the cure process, details of the components in the mixture and the effects of various additives on the physical properties of the adhesives which are created. The performance of an adhesive may vary with time as a consequence of stress-induced changes which are triggered by thermal effects or by hygrothermal factors. The review considers joints created using metal substrates and carbon fibre composites. The performance and durability of an adhesive bond is critically dependent on the stability of the interface between the adhesive and adherend and is sensitive to the pre-treatment processes used in the creation of the bond. The review outlines how broadband dielectric measurements can be used to non-destructively monitor the cure of adhesive bonds and the processes involved in ageing of joint. The dielectric method gives an insight into the fundamental processes which are giving rise to the changes in the mechanical properties of the joint as they age.

show abstract

“…In another study, no shear strength reduction was obtained after 833 temperature cycles between –20°C and 20°C at 50% relative humidity (RH) but the steel/CF composite joint failure mode was nevertheless changed to an adhesive failure mode. 6 Steel/CF composite joints were exposed to deionised water at a temperature of 75°C for 162 weeks and eventually stored at –20°C for a period of 24 h. 7 Water absorption led to plasticisation of the adhesive and water freezing to the creation of micro voids. Desorption and re-absorption experiments showed that the specimens exposed to a temperature of –20°C for 24 h absorbed more water than those that were not.…”

Section: Introductionmentioning

confidence: 99%

“…Desorption and reabsorption experiments showed that the specimens exposed to a temperature of -20 C for 24 h absorbed more water than those that were not. Thus, for thermoset composites and their bonded joints, it seems that freeze/thaw cycles alone do not have a significant detrimental effect on the bond strength, 6,8 while the combination with moisture absorption causes a degradation of the adhesive 7 and a reduction of the joint strength. 5,9 Thermoplastic composites are said to be less affected by environmental conditions compared to thermoset composites.…”

Section: Introductionmentioning

confidence: 99%

Influence of freeze/thaw cycling on the mechanical performance of resistance-welded carbon fibre/polyphenylene sulphide composite joints

Rohart

Lebel

Dubé

2020

Journal of Reinforced Plastics and Composites

View full text Add to dashboard Cite

This study evaluates the effects of freeze/thaw cycles on the mechanical performance and failure mode of resistance-welded carbon fibre/polyphenylene sulphide composite joints. Dry and moisture-saturated joints are subjected to 1000 temperature cycles varying between –40°C and 82°C. A silane coating is applied on the stainless steel mesh heating element to improve its adhesion with the polyphenylene sulphide polymer. Results show the limited impact that freeze/thaw cycles have on the lap shear strength of joints welded without any coating on the heating element. The silane coating improves the lap shear strength by 32% when no freeze/thaw cycles are applied to the joints. This improvement of 32% reduces when joints are subjected to freeze/thaw cycles but the mechanical performance remains superior to that of joints welded using uncoated heating element. Fracture surfaces show that fibre/matrix and stainless steel/matrix interfaces are both affected by the environmental conditions although it does not translate into lower lap shear strength.

show abstract

A dielectric study of hydrolytic ageing and the effects of periodic freezing in carbon fibre reinforced plastic jointed structures

Cited by 8 publications

References 15 publications

Mechanical properties of pultruded glass fiber reinforced plastic after freeze–thaw cycling

Mechanical properties of pultruded glass fiber reinforced plastic after freeze–thaw cycling

Design and ageing of adhesives for structural adhesive bonding – A review

Influence of freeze/thaw cycling on the mechanical performance of resistance-welded carbon fibre/polyphenylene sulphide composite joints

Contact Info

Product

Resources

About