Rapid evaluation of long-term thermal degradation of carbon fibre epoxy composites

Wolfrum, Johannes; Eibl, Sebastian; Lietch, L.

doi:10.1016/j.compscitech.2008.11.018

Cited by 100 publications

(92 citation statements)

References 22 publications

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“…Even if the temperatures considered in Ref. [38] are much higher (close to the glass transition temperature) than those discussed here, a decreasing trend of the interfacial strength with temperature is still identifiable from the fractographic evidence. Therefore, as the interfacial bond strength decreases at elevated temperatures, the delamination grows faster when the temperature increases.…”

Section: Fracture Surfaces Exposed To Fatigue Loadingmentioning

confidence: 69%

“…Previous studies in the literature have shown that the interfacial bond between the fibres and the matrix deteriorates for long exposure times at elevated temperatures. Wolfrum et al [38] showed that the laminate exposure to temperatures between 180-200°C resulted in an Interlaminar Shear Strength (ILSS) reduction of 20% for the highest temperature in the first 10 days. Further ILSS reductions were observed for longer exposure times.…”

Section: Fracture Surfaces Exposed To Fatigue Loadingmentioning

confidence: 99%

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Temperature effects on mixed mode I/II delamination under quasi-static and fatigue loading of a carbon/epoxy composite

Charalambous

Allegri²,

Hallett

2015

Composites Part A: Applied Science and Manufacturing

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© 2015 The Authors.Abstract This paper addresses the effect of temperature on the mixed-mode interlaminar fracture toughness and fatigue delamination growth rate of a carbon-fibre/epoxy material, namely IM7/8552. Quasi-static and fatigue characterisation tests were carried out at -50 °C, 20 °C, 50 °C and 80 °C, using asymmetric cut-ply coupons. The experimental results show that temperature may have an accelerating or delaying effect on delamination growth, depending on the loading regime, i.e. either quasi-static or fatigue. Fractographic examinations were also carried out in order to assist the interpretation of the experimental data. A semi-empirical equation is introduced to describe the experimentally observed fatigue delamination growth rates at elevated temperatures

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Section: Fracture Surfaces Exposed To Fatigue Loadingmentioning

confidence: 69%

Section: Fracture Surfaces Exposed To Fatigue Loadingmentioning

confidence: 99%

Temperature effects on mixed mode I/II delamination under quasi-static and fatigue loading of a carbon/epoxy composite

Charalambous

Allegri²,

Hallett

2015

Composites Part A: Applied Science and Manufacturing

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“…After the above observations, the decomposition and glass transition temperatures of the epoxy resin included in the CFRP specimens were measured by differential scanning calorimetry (DSC) (SII NanoTechnology Inc.). Figure 5 shows the obtained DSC curve which indicates that T g for the resin is 413.7 K. HAZ is induced at the surface cut by laser in a few milliseconds at 1273-2273 K, [18,19] while aging occurs during a few hundred hours at 373-473 K. [20,21] The damage in laser-induced HAZ area is different from the iso-thermal aging-induced damages in terms of the time and temperature scales. On the other hand, the area far from the surface cut by laser is heated at the temperature lower than 1273 K. Such an area may not be included in the narrowly defined HAZ but in the broadly defined HAZ.…”

Section: Methodsmentioning

confidence: 98%

Relationship between transition of fracture mode of carbon fiber-reinforced plastic and glass transition temperature of its resin

Muramatsu

Harada

Suzuki

et al. 2015

Advanced Composite Materials

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In this study, the correlation between the stress-strain behavior of a carbon fiber-reinforced plastic (CFRP) and the temperature at which the heat-affected zone (HAZ) is generated is investigated. First, CFRP ([−45/45] 2s laminate) specimens were heated at several temperatures to induce thermal damage, i.e. a HAZ. Subsequently, tensile tests were conducted on the specimens with thermal damage. Then, microscopy and X-ray measurements were carried out to discuss the stressstrain responses from a microscopic viewpoint. The results of strain measurement during thermal treatment indicated that the strain increases with increasing temperature. The tensile tests showed that the CFRP specimens subjected to thermal damage during heating at a high temperature fractured in the ductile mode, whereas the fracture mode of the CFRP specimens with low-temperature thermal damage was discontinuous. Microstructure observation using X-ray tomography showed that the debonding between the carbon fibers and the resin matrix induced by heating to above the glass transition temperature was responsible for the continuous fracture mode.

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“…The thermo-oxidative degradation of CFPMCs is mainly controlled by the matrix and fiber/matrix oxidation [4,23e25], and the FS and ILSS of CFPMCs are very sensitive to the matrix strength and the interfacial bonding between the fiber and matrix [26,27]; hence, FS and ILSS were chosen as positive indicators of thermo-oxidative degradation.…”

Section: Mechanical Properties Analysismentioning

confidence: 99%

Improved thermo-oxidative stability of three-dimensional and four-directional braided carbon fiber/epoxy hierarchical composites using graphene-reinforced gradient interface layer

Fan

Zheng

2015

Polymer Testing

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a b s t r a c tIn order to improve the thermo-oxidative stability of three-dimensional and fourdirectional braided carbon fiber/epoxy composites, we introduced a gradient interphase reinforced by graphene nanoplatelets (GN) between the carbon fiber and the matrix, with a liquid phase deposition strategy. Both the interlaminar shear strength and the flexural strength of the composites were improved after thermo-oxidative aging at 140 C for various durations (up to 1200 h). The interfacial reinforcing mechanisms are explored by analyzing the structure of the interfacial phase, thermal conductivity, weight loss, surface topography, fiber/matrix interfacial morphology and thermomechanical properties of the composites. Results indicate that the GN-reinforced gradient interphase provides an effective shield against interface oxidation, assists in thermal stress transfer, and restricts the movement of the different phases of materials at the composite interface.

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Rapid evaluation of long-term thermal degradation of carbon fibre epoxy composites

Cited by 100 publications

References 22 publications

Temperature effects on mixed mode I/II delamination under quasi-static and fatigue loading of a carbon/epoxy composite

Temperature effects on mixed mode I/II delamination under quasi-static and fatigue loading of a carbon/epoxy composite

Relationship between transition of fracture mode of carbon fiber-reinforced plastic and glass transition temperature of its resin

Improved thermo-oxidative stability of three-dimensional and four-directional braided carbon fiber/epoxy hierarchical composites using graphene-reinforced gradient interface layer

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