Fracture mechanisms and failure analysis of carbon fibre/toughened epoxy composites subjected to compressive loading

Jumahat, Aidah; Soutis, C.; Jones, FR; Hodzic, A.

doi:10.1016/j.compstruct.2009.08.010

Cited by 187 publications

(100 citation statements)

References 17 publications

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“…Scanning electron micrographs revealed that the failure of the unidirectional CFRP composite laminate was initiated by fibre microbuckling and subsequent plastic kinking of the material [4]. Therefore the development of stiffer and tougher matrices is aimed at delaying fibre microbuckling, extend plastic hardening behaviour of the matrix and give better resistance to crack initiation and propagation.…”

Section: Introductionmentioning

confidence: 99%

Effect of silica nanoparticles on compressive properties of an epoxy polymer

et al. 2010

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The effect of nanosilica on compressive properties of an Epikote 828 epoxy at room temperature was studied. A 40 wt% nanosilica/epoxy masterbatch (nanopox F400) was used to prepare a series of epoxy based nanocomposites with 5-25 wt% nanosilica content. Static uniaxial compression tests were conducted on cubic and cylindrical specimens to study the compressive stress-strain response, failure mechanisms and damage characteristics of the pure and nanomodified epoxy. It was found that the compressive stiffness and strength were improved with increasing nanosilica content without significant reduction in failure strain.The presence of nanosilica improved ductility and promoted higher plastic hardening behaviour after yielding in comparison with the unmodified resin system. This result suggested that nanoparticles introduced additional mechanisms of energy absorption to enhance the compressive properties without reducing the deformation to failure.

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Section: Introductionmentioning

confidence: 99%

Effect of silica nanoparticles on compressive properties of an epoxy polymer

et al. 2010

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“…It was reported that the moisture-induced degradation is associated with a decrease in the interfacial strength rather than the degradation of matrix mechanical properties. Jumahat 13 used a SEM and optical microscopy to propose a possible sequence of failure initiation and propagation of carbon fiber / toughened epoxy composites subjected to compressive loading. The micrographs revealed that the misaligned fibers failed in two points upon reaching maximum micro-bending deformation and two planes of fracture were created to form a kink band.…”

Section: Introductionmentioning

confidence: 99%

Carbon Fiber Reinforced Polymer and Epoxy Adhesive Tensile Test Failure Analysis Using Scanning Electron Microscopy

2017

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Morphological characteristics analysis before and after tensile tests were studied using scanning electron microscopy (SEM) technique to follow the failure evolution on carbon fiber reinforced polymer (CFRP) and epoxy resins. Micrograph analysis of CFRP plate before tensile test shows some intrinsic manufacturing defects, which can influence the mechanical properties of the material. Micrograph analysis after tensile test shows that cracks propagation start in manufacturing defects, which lead the carbon fiber to be pulled out instead of breaking. Thus, cracks propagate through interfacial zones affecting the sharing force between matrix and carbon fiber. For the epoxies materials, the microscopy analysis showed that although epoxies adhesive have different phase distribution before tensile test, failure surfaces are described by fine granular particles covalent bonded with matrix, and the material fails in a brittle manner when the strength outstripped these bonds. Failure process for each material correlating the mechanical properties with the morphological characteristics of materials was discussed.

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“…So far the improvement in properties of composites with silica has always resulted from high concentrations of the latter [32][33][34]. Jumahat et al [35,36] reported the addition of 13 wt% nanosilica into epoxy matrix enhanced the compressive modulus by 19% and compressive strength by The high percentages of silica significantly increase the viscosity of compositions and influence many intrinsic properties of epoxy matrix and further, processability of the resin. Therefore, development of an effective, convenient, and low-cost process toward high performance silica modified epoxy based hybrid composites with uniform dispersion of nanosilica and better silica-epoxy adhesion warrant more research.…”

Section: Mechanical Properties Of Compositesmentioning

confidence: 97%

Mechanical properties of hybrid structural composites reinforced with nanosilica

et al. 2014

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Epoxy‐based hybrid structural composites reinforced with 14 nm spherical silica particles were investigated for mechanical properties as a function of nanosilica loading fractions. Composites were fabricated using continuous glass or carbon fiber of unidirectional architecture and nanosilica dispersed epoxy, through resin film infusion process. Uniform dispersion of nanoparticles in resin matrix was ensured by an optimized ultrasound‐assisted process. Although resin viscosity marginally reduces in the presence of nanosilica enabling a better control in composite manufacturing process, glass transition temperature of epoxy remained unaffected at low weight fractions. Compressive strength of hybrid glass or carbon fiber/epoxy composites showed more than 30–35% increase with nanosilica at a concentration as low as 0.2 wt%. Tensile and compressive properties of hybrid composites in transverse direction to the reinforcement remained unaffected. POLYM. COMPOS. 37:1216–1222, 2016. © 2014 Society of Plastics Engineers

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Fracture mechanisms and failure analysis of carbon fibre/toughened epoxy composites subjected to compressive loading

Cited by 187 publications

References 17 publications

Effect of silica nanoparticles on compressive properties of an epoxy polymer

Effect of silica nanoparticles on compressive properties of an epoxy polymer

Carbon Fiber Reinforced Polymer and Epoxy Adhesive Tensile Test Failure Analysis Using Scanning Electron Microscopy

Mechanical properties of hybrid structural composites reinforced with nanosilica

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