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Showing 1 to 20 of 40 for “"glass/epoxy"”.
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Correlation of three standard shear tests for unidirectional glass-epoxy composites
The shear strength of unidirectional glass-epoxy composites was determined experimentally by three standard shear tests. The tests consisted of short beam interlaminar shear tests, saw-cut shear tests, and torsion tests on circumferentially wound cylinders. Test results show that the short beam …
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Measurement of Interfacial Adhesion in Glass-Epoxy Systems Using the Indentation Method
… Certain engineering applications require an epoxy coating on a brittle substrate to protect and improve the performance of the substrate. Experimental observations and measurements of interfacial adhesion in glass-epoxy systems are described in this thesis. A comparison study of how different …
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Self-healing of delamination damage in glass/epoxy composites using catalyst functionalized fibers
… applications are explored in 2D woven glass/epoxy composites for ultimate use in 3D woven composites. Initial work focuses on a new method for introducing self-healing components into low temperature cure 2D fiber-reinforced polymer composites. In these studies, glass fiber preforms are …
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Transmitted light intensity as a nondestructive evaluation technique for glass/epoxy composite laminates
Selection of a nondestructive evaluation method for inspection of composite materials is a difficult process due to their multilithic nature and complex failure. Development of new techniques, which are more cost-effective and practical, are needed. Transmitted light intensity has the potential to …
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Damage Assessment and Strength Predictions in S-Glass/Epoxy Laminates Subjected to Low Energy Impact
<p>Composite materials have become one of the leading materials for manufacturing in the aerospace industry today. Compared to "conventional" aerospace metals, composites generally have higher strength-to-weight and stiffness-to-weight ratios, good fatigue and corrosion resistance and reduced parts …
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Investigation of Residual Stresses in Shape Memory Alloy (Sma) Composites
… residual hoop stresses in nitino/graphite/epoxy composites leads to radial cracking around the embedded nitinol wires. Based on modeling results, the most important factor in reducing residual stresses (and thereby preventing radial cracking) is increasing the level of recovery strain for …
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Thermoelastic stress analysis of laminated composite materials
… have been explored. A set of carefully selected glass/epoxy composite specimens with designated stacking sequences provided a scheme to identify the source and nature of the thermoelastic response. All of the material properties of the composite laminate were obtained experimentally, to aid an …
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Frequency dependent heat generation during vibrothermographic testing of composite materials
… Vibrothermographic tests were performed on three glass-epoxy panels that each contained four different sized simulated delaminations. Comparison between the observed vibrothermal peak frequencies and the natural frequencies predicted by the local resonance model, and investigations of the …
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IGFEM modeling of transverse failure in carbon-epoxy composites and implementation of the IGFEM in Abaqus FEA
… cracking performed on a [0/90/0] carbon/glass-epoxy laminate. Furthermore, a large dataset of realistic virtual microstructures is created from optical images of test specimens and was simulated to study the effects of microstrucutural geometric characteristics on the onset of initial …
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Forced vibration and hygrothermal analysis of composite laminated beams under the action of moving loads
The dynamic response of simply supported glass/epoxy composite beams subjected to moving loads in a hygrothermal environment is carried out using the general purpose finite element program ANSYS. The moving load model and the hygrothermal incorporation are validated separately by reproducing …
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Matrix-fiber stress transfer in composite materials elasto-plastic model with an interphase layer
The matrix-fiber stress transfer in glass/epoxy composite materials was studied using analytical and experimental methods. The mathematical model that was developed calculates the stress fields in the fiber, interphase, and neighboring matrix near a fiber break. This scheme takes into account the …
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An Experimental Investigation of GLARE and Restructured Fiber Metal Laminates
… are a group of materials fabricated by bonding glass/epoxy layers within metal layers. This class of materials can provide good mechanical properties, as well as weight savings. An FML known as Glass Laminate Aluminum Reinforced Epoxy (GLARE) was studied. An experimental investigation comprising …
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Modeling and testing of stitched composite laminates for enhanced interlaminar strength
… assesses the effects of stitching a four-layer E-glass/Epoxy cross-ply laminate with translaminar reinforcement consisting of E-glass yarns. Both experimental characterization and finite element analysis have been employed to accurately predict and analyze the properties of the stitched …
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Analysis of Composite Laminates with Matrix Cracks
… (3-D problem) are studied. Results for graphite/epoxy cross-ply laminates are presented and compared to those of other approaches. Some other materials, for instance, glass/epoxy, are also studied. The results and comparisons will appear where appropriate. In general, the agreement between the …
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Simulation of Fatigue Performance & Creep Rupture of Glass-Reinforced Polymeric Composites for Infrastructure Applications
… duration. Simulation of the fatigue of glass fiber-reinforced composites is achieved by replacing the constant stress parameter in the model with a sinusoidal wave function. Results from the creep rupture model using fused silica fiber parameters, compare well with S-2 glass/epoxy …
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Low-velocity Impact Analysis of Composite Repair Patches of Different Shapes
… to the experimental data from literature. E-glass/epoxy composite laminate was subjected to a low velocity impact test. To study the effect of patch repair, a composite patch was applied on a cracked laminate and a low velocity impact was then conducted on this model. The FEA results were …
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Energy Absorption of Metal-FRP Hybrid Square Tubes
… number of layers) on the energy absorption of S2-glass/epoxy-304 stainless steel square tubes were experimentally investigated. In addition, a new geometrical trigger was demonstrated which has positive effects on the collapse modes, delamination in the FRP, and the crush load efficiency of the …
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Compressive strength of lamina reinforced and fiber reinforced composite materials
… were performed on aluminum-wax laminates, boron-epoxy tubes and S-glass-epoxy tubes. In addition, torsion tests and combined compression and torsion tests were conducted on the fiber reinforced tubes. Coordinates of fibers in a boron-epoxy laminate were measured. Experimental results indicate …
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Stiffness reduction resulting from transverse cracking in fiber- reinforced composite laminates
… on laminate stiffness was studied. Four. glass-epoxy laminates ([0,90₃]<sub>s</sub>, [90₃,0]<sub>s</sub>, [0,90]<sub>s</sub>, and [0,±45]<sub>s</sub>) were evaluated. Two experimental test sequences were performed. In the first test sequence, longitudinal stiffness was measured at various …
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An investigation of the excitation frequency dependent behavior of fiber reinforced epoxy composites during vibrothermographic inspection
… of vibrothermography is demonstrated in glass and graphite reinforced epoxy components. Impact damage sites are located in graphite epoxy panels using vibrothermography. The size of the damage is indicated not only by the size of the hot region but also by the temperature rise in the …
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