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Showing 1 to 20 of 32 for “"interfacial shear strength"”.
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Evaluation of fiber-matrix interfacial shear strength in fiber reinforced plastics
… fibers were shown to change the fiber tensile strength markedly. Filament wound unidirectional composites were tested in short beam "shear." Corresponding samples were fabricated by embedding one to seven fibers in the center of polymer dogbone specimens that were tested in tension to determine …
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The Use of Nanonindentation to Determine Composite Interfacial Shear Strength and the Effects of Environmental Aging
… be ascertained from a micromechanical test for interfacial shear strength (IFSS) on as-processed materials. The accomplishment of this goal would create more information with fewer experiments and a need for less experimental materials. In this study, a nanoindenter uniquely outfitted with a …
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Development of Micro and Nanostructured Materials for Interfacial Self -Healing
… are used to test virgin and healed fiber-matrix interfacial shear strength. When damage initiates at the fiber-matrix interface, the attached capsules rupture, and healing agent is released into the crack plane where it contacts the Grubbs' catalyst to initiate polymerization. Up to 44% recovery …
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An Investigation of the Structure-Property Relationships for High Performance Thermoplastic Matrix, Carbon Fiber Composites with a Tailored Polyimide Interphase
… acid salts were used. The transverse flexure strength was used to qualitatively rank the composites by level of interfacial shear strength. The longitudinal tensile strength of the composites was shown to vary with relative interfacial shear strength. The trend of these data qualitatively …
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Indentation testing of composite materials: a novel approach to measuring interfacial characteristics and engineering properties
… was developed as an attempt to evaluate the interfacial shear strength at a mesolevel, possibly overcoming the deficiencies of present techniques. Vickers Microhardness Testing and Continuous Ball Indentation Testing (CBIT) of composite materials provided data for assessing the sensitivity of …
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An investigation of the interfacial characteristics of nitinol fibers in a thermoset composite
… many material properties, including the interfacial shear strength between the embedded sensor or actuator and the matrix must be thoroughly understood.. Investigations were performed in order to examine the effects of different variables on the interfacial characteristics between a …
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Local and Effective Mechanical Properties of Polymer Nanocomposites
… epoxy. In this regard, local information of the interfacial properties of embedded nanoparticles can be the key in developing calibrated hierarchical damage models. To this effect, a new methodology was developed to quantify the average interfacial shear strength (IFSS) of individual vapor grown …
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Lyocell Fiber-Reinforced Cellulose Ester Composites - Surface and Consolidation Considerations, and Properties
… (lyocell). Of particular concern were both the interfacial adhesion between the fiber and matrix and the consolidation process in the manufacture of these composite materials. Interfacial adhesion was found to be substantial due to the relative lack of the fiber pull-out phenomenon observed …
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Deposition and Characterization of Ceramic Thin Films and a New Experimental Approach to Evaluate the Mechanical Integrity of Film/Substrate Interfacial Layers
… resistance, high temperature stability, high strength, and high hardness, refractory ceramic thin films and coatings have been utilized for surface engineering of mechanical components and mechanical fabrication tools. Adhesion between ceramic thin films and coatings and the substrate is of …
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Cohesive Zone Modelling of Fiber–Matrix Interface in Composite Materials
… applications due to their high specific strength, stiffness, and design flexibility. Their mechanical performance is critically governed by the fiber–matrix interface which controls stress transfer and directly influences damage initiation, crack propagation, and fracture behaviour. The …
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Deformation-assisted antifouling of surfaces
… side of the membrane using a syringe pump The interfacial shear strength was then measured after the desired number of cycles It will be shown that the interfacial shear strength decrease with the number of deformation cycles, even though the interfacial shear stresses generated by the cyclic …
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Tensile and interfacial properties of radially aligned CNT grown carbon fibers
The relatively high mass-specific strength and stiffness of carbon fibers (CFs) has established CF reinforced plastics (CFRPs) as the benchmark material for next-generation aerospace structures. While CFRPs with radially-grown aligned carbon nanotubes (CNTs), termed fuzzy fiber reinforced plastics …
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Study of Durability of Epoxy Bonded Joints in Aqueous Environments
… for various time periods. The mechanical strengths of the bonded joints were evaluated using a three-point flexure test. The neat epoxy samples were also aged under the same conditions, and three-point flexure test and dynamic mechanical analysis (DMA) were performed to evaluate their …
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Influence of the Interphase on the Mechanical Properties of Nylon 66 Composites
… the modified fiber pull-out test showed that the interfacial shear strength decreases as the interphase becomes more spherulitic. Scanning electron microscopy revealed a more cohesive fracture surface of the samples having a transcrystalline interphase. Dynamic mechanical analysis showed that the …
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Modelling environmental effects on fracture damage of natural fibre-reinforced polymer composites
… composite test specimens. Retention of fracture strength of the composite was further assessed both at macro and micro levels. The assessment of the fracture toughness properties was conducted on eccentrically loaded in tension single-edge-notch (ESE(T)) specimens; whereas fibre/matrix …
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Modelling environmental effects on fracture damage of natural fibre-reinforced polymer composites
… composite test specimens. Retention of fracture strength of the composite was further assessed both at macro and micro levels. The assessment of the fracture toughness properties was conducted on eccentrically loaded in tension single-edge-notch (ESE(T)) specimens; whereas fibre/matrix …
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FLEXURAL STRENGTHENING OF RC BEAMS USING FERROCEMENT LAMINATES
… the behaviour reinforced concrete beams strengthened in flexure using ferrocement laminates attached onto the soffits (tension face). Five aspects were studied; 1) the theoretical ultimate and serviceability characteristics of the strengthened beams, 2) the concrete/ferrocement …
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Mechanical and interfacial properties of carbon nanofibers for polymer nanocomposites
… nm were tested individually for their tensile strength by a MEMS mechanical testing platform. Their nominal tensile strengths followed Weibull distributions with characteristic strength values between 2.74- 3.34 GPa, which correlated well with the expected effects of heat treatment and …
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Multiscale Mechanics of Graphene Oxide and Graphene Based Composite Films
… Monolayer GO was measured to have an average strength of 24.7 GPa,, orders of magnitude higher than previously reported values for GO paper and approximately 50% of the 2D intrinsic strength of pristine graphene. The huge discrepancy between the strength of monolayer GO and that of bulk GO …
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Investigation of Waterborne Epoxies for E-Glass Composites
Research is presented which encompasses a study of epoxies based on diglycidyl ether of bisphenol A (DGEBA) cured with 2-ethyl-4-methylimidazole (EMI-24) in the presence of the nonionic surfactant Triton X-100. Interest in this epoxy system is due partially to the potential application as a …
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