Mechanical and fatigue properties of long carbon fiber reinforced plastics at low temperature

Okayasu, Mitsuhiro; Tsuchiya, Yuki

doi:10.1016/j.jsamd.2019.10.002

Cited by 17 publications

(18 citation statements)

References 13 publications

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“…[ 19 ] Exposing the CFRP to pure low or cryo temperatures, the matrix is more brittle leading to nucleation of cracks at the fiber/matrix interface, formation of rows of cups and crack initiation which propagates along the fibers through the cups. [ 25,29 ] The number of delaminated fibers is increasing and composite laminates are more compact after the fracture. [ 26,27,64 ] Comparing the results of various influences to the CFRP behavior under the influence of moisture and low temperature, several intersections can be observed.…”

Section: Resultsmentioning

confidence: 99%

“…Lower fiber volume results in an increase in strength, but a higher volume tends to lead to a decrease in strength because there are more interfaces in the material, which induce greater residual stresses. [ 29 ] The residual stress induces microscopic cracks at the interface which is resulting in coalesce to macrocracks formation separating the fibers from the matrix. The ductility of the matrix is also limiting factor at low temperatures, as the matrix shrinks and creates internal stresses.…”

Section: Introductionmentioning

confidence: 99%

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The effect of long‐time moisture exposure and low temperatures on mechanical behavior of open‐hole Cfrp laminate

et al. 2021

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Carbon fiber composite laminates (CFRP) used in aerospace are operating under various environmental conditions. Parts are often exposed to moisture which slowly diffuses into the laminate and forms internal stresses. During the flight, the aircraft is also exposed to low or elevated temperatures. The result is negative impact on composite performance due to formation of hygrothermal stresses. Understanding this phenomenon helps with prediction of the damage development which is vital for increasing the components service life. The open‐hole CFRP laminates were conditioned in humid air at 70°C/85% RH for 33,800 h and the effect of low temperatures on quasi‐cyclic tension properties and fracture behavior was investigated. The mechanical tests on two types of CFRP laminate with different number and orientation of plies were performed under − 55°C. The material behavior during the testing was monitored by acoustic emission technique. The light optical microscopy and scanning electron microscopy were used for the identification of failure mechanisms. The study showed that the hygrothermal effect has significant impact on materials toughness reduction. The damage mechanisms and characteristic morphologic features are changing due to the matrix degradation and weakened fiber/matrix interface.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The effect of long‐time moisture exposure and low temperatures on mechanical behavior of open‐hole Cfrp laminate

et al. 2021

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“…Li et al [ 105 ] has examined graphene coated short CF reinforced polyethersulfone composites to be used in cryogenic engineering field. The cryogenic mechanical performance was examined in the cryogenic tensile and bending test systems ( Figure 2 A) as demonstrated by Okayasu et al [ 106 ]. In the work conducted by Li et al [ 105 ], the sizing was conducted in a method similar to the Hummers method through acid oxidation of graphite powders.…”

Section: Types Of Coatingmentioning

confidence: 99%

Section: Figurementioning

confidence: 99%

Carbonaceous Materials Coated Carbon Fibre Reinforced Polymer Matrix Composites

et al. 2021

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Carbon fibre reinforced polymer composites have high mechanical properties that make them exemplary engineered materials to carry loads and stresses. Coupling fibre and matrix together require good understanding of not only fibre morphology but also matrix rheology. One way of having a strongly coupled fibre and matrix interface is to size the reinforcing fibres by means of micro- or nanocarbon materials coating on the fibre surface. Common coating materials used are carbon nanotubes and nanofibres and graphene, and more recently carbon black (colloidal particles of virtually pure elemental carbon) and graphite. There are several chemical, thermal, and electrochemical processes that are used for coating the carbonous materials onto a carbon fibre surface. Sizing of fibres provides higher interfacial adhesion between fibre and matrix and allows better fibre wetting by the surrounded matrix material. This review paper goes over numerous techniques that are used for engineering the interface between both fibre and matrix systems, which is eventually the key to better mechanical properties of the composite systems.

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“…Hence, the in-plane compressive failure load at cryogenic temperature was bigger than the failure load at ambient temperature. [34,35] However, at high temperature, the epoxy resin matrix gradually changed from rigid glass state to soft high elastic state, and the interface performances between the fibers and the matrix were weaker, making the ability of matrix transferred stress between the fibers become lower. Thus, the in-plane compressive load at high temperature was lower than that at room temperature.…”

Section: Failure Loadmentioning

confidence: 99%

The effects of temperature on compressive responses and failure behaviors of composite Y‐frame cores sandwich structure

Jiang

Zhou

et al. 2021

Polymer Composites

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The temperature has an important effect on mechanical behaviors of composite Y-frame cores sandwich structure. Therefore, the in-plane compressive behaviors of this structure should be thoroughly studied before it is used in engineering structures. The in-plane compressive tests for Y-frame cores sandwich structure were carried out within the temperature ranged from À70 C to 200 C. The load-deformation curves, deformation modes, and failure load of sandwich structure at various temperatures were compared and discussed. The results revealed that the deformation modes, load-deformation curves, and failure load were closely associated with the testing temperature. The cryogenic temperature caused the increasing of the failure load of Y-frame cores sandwich structure. However, the high temperature caused the degradation of the failure load of Y-frame cores sandwich structure. The in-plane compressive failure load increased from 11.78 to 14.82 kN as the testing temperature fell from 20 C to À70 C while the in-plane compressive failure load decreased from 11.78 to 2.06 kN as the testing temperature increased from 20 C to 200 C. The theoretical expression was also given to forecast the compressive failure load, and the theoretical results would be compared with the experimental results.

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Mechanical and fatigue properties of long carbon fiber reinforced plastics at low temperature

Cited by 17 publications

References 13 publications

The effect of long‐time moisture exposure and low temperatures on mechanical behavior of open‐hole Cfrp laminate

The effect of long‐time moisture exposure and low temperatures on mechanical behavior of open‐hole Cfrp laminate

Carbonaceous Materials Coated Carbon Fibre Reinforced Polymer Matrix Composites

The effects of temperature on compressive responses and failure behaviors of composite Y‐frame cores sandwich structure

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