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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 27 for “"Carbon Fiber Epoxy"”.
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The influence of surface properties on carbon fiber/epoxy matrix interfacial adhesion
… not only on the matrix and the reinforcing fiber, but also to a great extent on the fiber/matrix interfacial adhesion. The focus of this work was to study carbon fiber surface chemical and physical properties and their effects on fiber/matrix adhesion. Untreated, commercially surface treated …
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Fracture analysis of carbon fiber/epoxy matrix interface through microbond and cruciform tests
In fiber-reinforced polymeric-matrix composites, the fiber/matrix interface plays a key role in transferring loads from the fibers to the matrix through shear. In this project, we investigate numerically two tests, used to characterize the normal and shear interfacial failure of a carbon …
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Characterization of electrical conductivity of carbon fiber/epoxy composites with conductive AFM and scanning microwave impedance microscopy
… investigates the electrical conductivity of IM7 carbon fibers using two Atomic Force Microscope (AFM) –based techniques: Conductive AFM (C-AFM) and Scanning Microwave Impedance Microscopy (sMIM). Unidirectional IM7/977-3 carbon fiber/epoxy laminates were manufactured and examined with these two …
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Investigation of Processing Conditions and Viscoelastic Properties on Frictional Sliding Behavior of Unidirectional Carbon Fiber Epoxy Prepreg
The quality of continuous fiber reinforced polymer matrix composite parts and structures depends strongly on the friction during the composite forming process. The two major types of friction that cause deformations during this process are ply-ply friction and tool-ply friction. One of the …
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Self-sealing of thermal fatigue and mechanical damage in fiber-reinforced composite materials
Fiber reinforced composite tanks provide a promising method of storage for liquid oxygen and hydrogen for aerospace applications. The inherent thermal fatigue of these vessels leads to the formation of microcracks, which allow gas phase leakage across the tank walls. In this dissertation, …
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Characterization and modeling of the effect of environmental degradation on flexural strength of carbon/epoxy composites
… Superposition) to measure degradation of carbon-fiber/epoxy composite under hygrothermal exposure and applied tensile stress. The hygrothermal conditions capture the synergistic effects of field exposure and extreme temperatures, viz., hot/dry, hot/wet, cold/dry, and cold/wet. Short term …
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Design and development of a novel lightweight long-reach composite robotic arm
… that the prototype robot main-arm constructed of carbon fiber-epoxy composite material provides good stiffness-to-weight and strength-to-weight ratios. Finite element analysis (FEA) was performed on a 3-D computer model of the arm. Successful verification led to the use of the 3-D model to define …
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Atomic Oxygen Effects on Particulate Contamination and Short Beam Strength of Carbon Composites
… material over time, particularly polymers. Carbon fiber/epoxy composites are a commonly used spacecraft material affected by AO exposure. Carbon composites are used as a structural material, such as on solar panels; their large surface area therefore is a potential contamination source to …
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Durability of Chopped FiberReinforced Polymeric Composites for use in Experimental Automotive Fuel Cells
… has lead to concerns regarding the durability of fiber reinforced polymer (FRP) composite materials. Automotive fuel cell power train systems must prove themselves as a reliable alternative to the combustion engines and automatic transmissions. The use of polymer composites in fuel cells to serve …
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Investigation of Zinc Oxide Nanowires for Impedance Based Structural Health Monitoring
… layer of ZnO nanowires were grown on plane woven fiberglass fabric that was incorporated into a carbon fiber epoxy composite. The beam deflection velocity was measured as a varying voltage was applied to the composite. Using Hamilton's Principle and Galerkin's method of weighted residuals, a …
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Interfacial Thermomechanical Behavior of Hybrid Carbon Fibers
<p>The carbon fiber/epoxy interface is of great importance in composite design due to its load transfer mechanisms from the weak epoxy to the stronger fiber. Improving the strength of the interface reduces the risk of failure at the interface and improves the load transfer to the fiber. In this …
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An Investigation to Detect Delamination in Composite Laminated Plates Under Dynamic Loading
… specimens were manufactured using unidirectional carbon fiber/epoxy creating 11 cross-ply composite laminate plates with [0,90,0,90]<sub>s</sub> orientation. Delaminated regions were placed at one inch increments, horizontally along the specimen.</p> <p>During testing, one side of each composite …
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Mechanical Property Characterization of Polymeric Composites Reinforced by Continuous Microfibers
… employed to understand the effects of various fibers, their volume fractions and matrix properties in polymer composites. However, these experiments require fabrication of various composites which are time consuming and cost prohibitive. Advances in computational micromechanics allow us to …
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Microvascular composites as a multifunctional material for electric vehicles
… multifunctional objective using microvascular fiber-reinforced composites. Batteries are sandwiched between carbon fiber/epoxy panels containing embedded microchannels. Coolant flow enables active cooling while the composite material provides strength, stiffness, and crashworthiness at low …
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Micromechanics analysis of space simulated thermal deformations and stresses in continuous fiber reinforced composites
… induced deformations and stresses in continuous fiber-reinforced composites were investigated with a micromechanics analysis. The investigation focused on two primary areas. First, available explicit expressions for predicting the effective coefficients of thermal expansion (CTE's) for a …
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The development of a modified biaxial composite test specimen
… initial damage. The specimens are thick woven carbon fiber/epoxy bi-axial specimens which previously havent been tested before. Two types of geometries were fabricated, one out of IM7/UF3352 and one out of IM7/PATZ materials, both with a [(0/90)]s lay-up. The first geometry had the aluminum …
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An Investigation of Damage Arrestment Devices Application with Fastener/Hole Interaction
… foam, Last-A-Foam FR-6710 with two layers of a carbon-fiber/epoxy weave, LTM45, on both sides of the foam. The specimens were loaded under a compressive strain of 0.5 mm/min. The damage arrestment devices’ thickness was varied and tested under both monotonic and fatigue loading. The experimental …
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Imaging surface acoustic waves in anisotropic and periodic media
… propagation on a variety of periodic structures. Carbon-fiber/epoxy composites are first examined, and the elastic properties of a homogeneous sample are used to determine the surface-wave velocities of layered samples in the long-wavelength limit. Two systems are then examined in the dispersive …
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Experimental verification of optimal experimental designs for the estimation of thermal properties of composite materials
… the two-dimensional thermal properties of the carbon-fiber/epoxy-matrix composite, AS4/3502. Due to the anisotropic nature of the composite, the effective thermal conductivities through the thickness and in the plane of the composite needed to be estimated along with the volumetric heat …
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Experimental investigation of the effects of imperfections on the behavior of composite scarf joints
… were made from Toray T800/3900 pre-impregnated carbon fiber/epoxy composite material and 3M Scotch-Weld Structural Adhesive Film AF 555M using controlled processing techniques, some of which were specifically designed to handle the particular details of this work. The achieved geometry of all …
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