Search results for " Delamination Fracture Toughness"

showing 3 items of 3 documents

Mode I fracture toughness behaviour of epoxy resincarbon fiber composites cured by ionising radiation

2012

In this work Mode I fracture toughness behavior of Electron Beam cured unidirectional CFRP laminates is investigated by means of standardized Double Cantilever Beam (DCB) tests. A matrix system, comprising a DGEBA epoxy monomer and a typical initiator of cationic polymerization, was used and panel samples assembled by hand lay-up. Curing was achieved by 20 to 40 minutes irradiation on a pulsed 10 MeV Electron Beam accelerator. One batch of resin was also mixed with 10 phr of a PES thermoplastic monomer in order to enhance the matrix toughness. The influence of fibre-matrix adhesion, matrix toughening and matrix crosslinking density on the mode I delamination behavior have been investigated …

Settore ING-IND/14 - Progettazione Meccanica E Costruzione Di MacchineSettore CHIM/07 - Fondamenti Chimici Delle TecnologieRadiation Curing CFRP Delamination Fracture Toughness Dynamic Mechanical Thermal Analysis.
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Experimental evaluation of through-the-thickness stress distribution in transverse crack tension test samples

2015

Transverse Crack Tension (TCT) samples represent an alternative to End Notched Flexure configurations for the characterization of pure mode II fracture toughness of Fibre Reinforced Polymer composites. TCT is supposed to reproduce a pure Mode II failure mechanism while avoiding the frictional energy dissipation between the flanks of a starter crack. The TCT geometry is that of a unidirectional tensile sample where a number of embedded plies, centered on the middle plane, are cut in the transverse fibres direction. The tensile loading should then activate four symmetric fronts of mode II delamination from the transverse cut tips. The present work describes the implementation of two full fiel…

Settore ING-IND/14 - Progettazione Meccanica E Costruzione Di MacchineSettore ING-IND/22 - Scienza E Tecnologia Dei MaterialiSettore ING-IND/04 - Costruzioni E Strutture AerospazialiSettore ING-IND/02 - Costruzioni E Impianti Navali E MariniMode II Delamination Fracture Toughness Transverse Crack Tension specimen Thermoelastic Stress Analysis Digital Image Correlation
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Mode I fracture toughness behavior of hydro-thermally aged carbon fibre reinforced DGEBA-HHPA-PES systems

2012

In this work the Mode I fracture toughness behavior of unidirectional CFRP laminates is investigated by means of Double Cantilever Beam (DCB) tests. The composite samples were manufactured by thermal curing after impregnation of a Carbon fabric with a DGEBA epoxy and anhydride HHPA curing agent. One resin batch was also mixed with a PES thermoplastic monomer to enhance the matrix toughness. Two lots of samples, toughened and un-toughened, were then left to soak in hot water to achieve various degrees of aging. The influence of matrix toughening and hydrothermal aging on the delamination behavior of the composite have then been assessed and correlated with characterization data from Dynamic …

chemistry.chemical_classificationToughnessMaterials scienceThermoplasticScanning electron microscopeComposite numberEpoxyDynamic mechanical analysisFracture toughnessSettore ING-IND/22 - Scienza E Tecnologia Dei Materialichemistryvisual_artCFRP Delamination Fracture Toughness Epoxy Resins Hydrothermal Agingvisual_art.visual_art_mediumComposite materialCuring (chemistry)
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