Determination of ply level residual stresses in a laminated carbon fibre-reinforced epoxy composite using constant, linear and quadratic variations of the incremental slitting method

Gower, M R L; Shaw, R M; Wright, L; Urquhart, J M; Hughes, Jeff; Gnaniah, S J P; Morrell, R.; Garstka, T.

doi:10.1016/j.compositesa.2016.08.005

Cited by 23 publications

(4 citation statements)

References 23 publications

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“…For composite materials, Eijpe and Powell [ 53 ] attempted to use this method for validation however it was observed that the vital surface machining influences the material by introducing added stresses. Also recently, Gower et al [ 54 ] gradually increased the milling of separate plies of the laminate to relax stress and observed the appearance of some visual traces from either through inadequate milling or milling into following plies. It was further recommended that the use of the present technology will be impossible for precise milling of laminates which affects the feasibility of this method.…”

Section: Defect Characterizationmentioning

confidence: 99%

Advances in structural analysis and process monitoring of thermoplastic composite pipes

Okolie

Latto²,

Faisal

et al. 2023

Heliyon

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Section: Defect Characterizationmentioning

confidence: 99%

Advances in structural analysis and process monitoring of thermoplastic composite pipes

Okolie

Latto²,

Faisal

et al. 2023

Heliyon

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“…Due to noncrystalline microstructure and anisotropic material properties of carbon fibre composites, it presents a big obstacle for the application of the diffraction-based techniques, which work well for metals. A few experimental techniques have been applied to CFRP parts with certain modifications, for example, the layer removal, 18,19 incremental slitting, 18,19 incremental hole drilling and deep hole drilling. 19 Analytical and numerical methods have also been developed for residual stress estimation in composite materials.…”

Section: Introductionmentioning

confidence: 99%

Feasibility study of friction stir joining of aluminium with carbon fibre reinforced thermoplastic composite

Malaske,

Blaga,

Bergmann

et al. 2024

Journal of Composite Materials

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During the last decades, environmental concerns and limited resources have set focus of research on lightweight, mechanically high-performing structures for the transportation industry, in order to reduce fuel consumptions and CO2 emissions. Friction Stir Joining (FSJ), as a variant of the Friction Stir Welding (FSW), is an innovative friction-based joining technique for metal-composite hybrid structures. Joining in the plasticized state below the melting temperature of the metal leads to a comparatively small heat-affected zone, so that only minor metallurgical changes occur. Additionally, only a short processing time and no additional weight in form of fasteners is needed. The main objective of this study is to evaluate the feasibility of metal-composite structures via FSJ, intending to enable a macro-mechanical interlocking bonding mechanism. Main focus was given to the integration of an aluminium nub inserted in a carbon fiber-reinforced polyphenylene sulfide (CF-PPS) sheet, to ensure sufficient plasticization of the aluminium part and no degradation in the polymer part. Residual stress arising from the friction stir joining process was also characterised using the Contour method. In this study, aluminium alloy 6082-T6 and CF-PPS composite sheets were used to produce long lap joints. Results have shown that the joints were created at almost constant peak temperature slightly above the melting temperature of the PPS but no physical-chemical changes were detected in the PPS. In addition, the influence of a PPS film as interlayer between the sheets was investigated in order to explore a method for preventing galvanic corrosion. Preliminary results indicate that it is not possible to integrate a metal nub to the CF-PPS without interrupting the PPS film. However, it is possible to create a nub within the PPS film.

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“…Hybrid polymer composites are anisotropic and due to the differences in CTE between the fibers and matrix, thermal stresses develop in the composite during their processing. The nature of residual stresses developed in the hybrid composite is different from those in the composite reinforced with a single type of fiber [ 1 , 2 , 3 , 4 ].…”

Section: Introductionmentioning

confidence: 99%

On the Residual Stresses and Fracture Toughness of Glass/Carbon Epoxy Composites

et al. 2022

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The resistance to delamination in polymer composite depends on their constituents, manufacturing process, environmental factors, specimen geometry, and loading conditions. The manufacturing of laminated composites is usually carried out at an elevated temperature, which induces thermal stresses in composites mainly due to a mismatch in the coefficient of thermal expansion (CTE) of fiber and matrix. This work aims to investigate the effect of these process-induced stresses on mode-I interlaminar fracture toughness (GI) of Glass-Carbon-Epoxy (GCE) and Glass-Epoxy (GE) composites. These composites are prepared using a manual layup technique and cured under room temperature, followed by post-curing using different curing conditions. Double cantilever beam (DCB) specimens were used to determine GI experimentally. The slitting technique was used to estimate residual stresses (longitudinal and transverse direction of crack growth) inherited in cured composites and the impact of these stresses on GI was investigated. Delaminated surfaces of composites were examined using a scanning electron microscopy (SEM) to investigate the effect of post-curing on the mode-I failure mechanism. It was found that GI of both GE and GEC composites are sensitive to the state of residual stress in the laminas. The increase in the GI of laminates can also be attributed to an increase in matrix deformation and fiber–matrix interfacial bond with the increase in post-curing temperature.

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Determination of ply level residual stresses in a laminated carbon fibre-reinforced epoxy composite using constant, linear and quadratic variations of the incremental slitting method

Cited by 23 publications

References 23 publications

Advances in structural analysis and process monitoring of thermoplastic composite pipes

Advances in structural analysis and process monitoring of thermoplastic composite pipes

Feasibility study of friction stir joining of aluminium with carbon fibre reinforced thermoplastic composite

On the Residual Stresses and Fracture Toughness of Glass/Carbon Epoxy Composites

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