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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 31 for “"carbon/epoxy"”.
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Finite element-based failure models for carbon/epoxy tape composites
Laminated carbon/epoxy composite structures are increasingly used in the aerospace industries. Low weight, elastic tailoring, and high durability make the composite materials well suited for replacement of conventional metallic structures. However the difficulty to capture structural failure …
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Flexural Behavior of Carbon/Epoxy IsoTruss Reinforced-Concrete Beam-Columns
… performed in the laboratory on two instrumented carbon/epoxy IsoTruss® reinforced concrete piles (IRC piles) and two instrumented steel reinforced concrete piles (SRC piles). The piles were approximately 14 ft (4.3 m) in length and 14 in (36 cm) in diameter and were loaded to failure while …
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Manufacturing Quality of Carbon/Epoxy IsoTruss (R) Reinforced Concrete Structures
… thesis explores the quality of hand-manufactured carbon-epoxy IsoTruss® grid structures for use as reinforcement in concrete piles. Large IsoTruss® grid structures were manufactured and embedded in 14.0" (35.6 cm) diameter concrete to create IsoPiles™. The IsoPiles™ were designed to have flexural …
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Fatigue behavior of notched carbon epoxy laminates during reversed cyclic loads
… strength were investigated for notched graphite epoxy laminates during fulIy-reversed cyclic loads. Two material systems, AS4/3501-6 and AS4/1808, two lamination arrangements, (0,45,90,-45)<sub>s</sub>₄ and (0,45,0,-45)<sub>s</sub>₄, and two notch configurations, central hole and opposing …
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In-Situ Testing of a Carbon/Epoxy IsoTruss Reinforced Concrete Foundation Pile
… investigation included one instrumented carbon/epoxy IsoTruss®-reinforced concrete pile (IRC pile) and one instrumented steel-reinforced concrete pile (SRC pile) which were driven into a clay profile at a test site. These two piles, each 30 ft (9 m) in length and 14 in (36 cm) in …
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The effects of tensile preloads on the impact response of carbon/epoxy laminates
… drop weight impact tests were conducted on carbon/epoxy laminates under various magnitudes of uniform tensile stress. The composite plates were 8 ply (+45,0,- 45,90)<sub>s</sub> laminates supported in a clamped-clamped/free-free configuration. Tensile preloads from near zero to approximately …
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Residual Compressive Strength Prediction of Carbon/Epoxy Laminates Subjected to Low Velocity Impact Damage
<p>Low energy impact damage to a composite structure is difficult to detect and can have profound effects on compressive strengths. Low energy impact damage is sometimes termed as barely visible impact damage (BVID). Detecting BVID is only possible by implementing nondestructive testing (NDT) …
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Exploring the link between microstructure statistics and transverse ply fracture in carbon/epoxy composites
Damage evolution within polymer matrix composites (PMCs) is difficult to characterize, as variability arises in the material microstructure from manufacturing and in the local strength of the constituents, which is inherently statistical. Transverse failure of unidirectional plies is particularly …
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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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IGFEM modeling of transverse failure in carbon-epoxy composites and implementation of the IGFEM in Abaqus FEA
… of transverse 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 …
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Compressive strength prediction for composite unmanned aerial vehicles
… presented to predict the compressive strength of carbon/epoxy compression specimens and prototype production parts using the model presented by Barbero in the Journal of Composite Materials, Vol. 32, No.5/1998. The experimental technique is an adaptation of the optical method first proposed by …
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Effects of Extreme Low Temperature on Composite Materials
… work includes estimating the shear strength of carbon/epoxy and glass/polyester composites at low temperatures and finding the rate of generation of microcracks in composites at cryogenic temperatures by acoustic emission technique. Microcracks increase the permeability of composites. So to …
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Microvascular composites as a multifunctional material for electric vehicles
… 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 weight. Several studies are performed on the cooling performance …
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Predicting failure behavior of polymeric and asphalt composites using damage models
… software. The failure behavior of an IM7/977-2 carbon epoxy composite material subjected to a Mode I delamination is predicted using traction-separation and bulk material damage models that are based on disturbed state concept (DSC) principles. The models were validated by comparing the results …
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Enviro-Mechanical Durability of Graphite/Epoxy Composite Materials
Carbon/epoxy laminates are receiving greater attention by the infrastructure, marine, and offshore oil industries due to the need for superior performance capabilities. Such applications generally involve subjecting materials to harsh temperature and moisture conditions. The objective of this study …
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An investigation of the feasibility of composite turbine compressor blades
… been conducted as to the feasibility of using a carbon fibre reinforced polymer (CFRP) composite to replace the titanium alloy (Ti-6Al-4V) for the manufacture of turbine compressor blades. These blades are used in the first compression stage of a gas turbine and suffer from high stresses at the …
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Modeling of ultrasonic processing
… of ultrasonic processing of an aerospace-grade carbon-epoxy composite laminate. An ultrasonic (approximately 30 kHz) loading horn is applied to a small region at the laminate surface, which produces a spatially nonuniform strain energy field within the material. A fraction of this strain energy …
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Analysis of After Impact Characteristics and Structural Optimization of CFRP Composite Plate
… were (a) to identify the characteristics of a carbon/epoxy composite plate after low-velocity impact, (b) to create a validated model to simulate the impact process and progressive failure, and (c) to perform sizing and shape optimization of the laminate for improving the damage resistance of …
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Experimental Design Optimization and Thermophysical Parameter Estimation of Composite Materials Using Genetic Algorithms
… volumetric heat capacity), of anisotropic carbon/epoxy composite materials. The two dimensional case was further investigated to evaluate the effects of the optimality criterion used for the experimental design on the accuracy of the estimated properties. The general-purpose GA-based …
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