Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 50 for “"carbon fiber composites"”.
-
Viscoplastic Study of 3D Printed Carbon Fiber Composites
… to model the viscoplastic response of 3D printed carbon fiber composites made using the Mark Two 3D printer by Markforged. The ability to manufacture composites through the use of 3D printers is relatively new and contains gaps in the various mechanical properties of the material, of interest is …
-
Detecting Delamination in Carbon Fiber Composites Using Piezoresistive Nanocomposites
<p>Carbon fiber prepreg composites are utilized successfully as structural materials for different lightweight aerospace applications. Delamination is a critical failure mode in these composite materials. As composite plies separate from each other, the composite loses some of its ability for …
-
Toughened bismaleimides, their carbon fiber composites and interphase evaluation studies
… as matrix resins for high performance composites. Modifier molecular weight, end group functionality, backbone structure and weight percent incorporation were all studied with respect to their influence on K<sub>lc</sub>, fracture toughness properties. Increases in fracture toughness …
-
Carbon nanotube growth on challenging substrates : applications for carbon-fiber composites
Nanoengineered hierarchal fiber architectures are promising approaches towards improving the inter- and intralaminar mechanical properties (e.g., toughness and strength) and non-mechanical properties of advanced fiber-reinforced composites such as graphite/epoxy. One fiber architecture of …
-
Multi-Axis Material Extrusion Additive Manufacturing of Continuous Carbon Fiber Composites
… one way to address these limitations is to use fiber-reinforced materials in combination with multi-axis deposition strategies. In material extrusion, embedded fibers will align themselves along the deposition path, providing structural, thermal, and chemical improvements. Multi-axis toolpathing …
-
Interlaminar reinforcement of carbon fiber composites from unidirectional prepreg utilizing aligned carbon nanotubes
Advanced laminated composites suffer from a lack of out-of-plane strength and toughness, leading to delamination and other types of interlaminar failure. Aligned carbon nanotubes (A-CNTs) placed at the interlayer between plies of an aerospace grade carbon fiber reinforced plastic composite (CFRP) …
-
Investigation of Machinability and Dust Emissions in Edge Trimming of Laminated Carbon Fiber Composites
The use of carbon fiber reinforced plastic (CFRP) systems for product structures has been steadily increasing because of superior material properties, including high strength, low weight, and corrosion resistance. CFRP parts may be molded to near net-shape geometry; however, machining operations …
-
Investigation of transverse electrical resistivity and electrical contact resistance of carbon fibers/carbon fiber composites
Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2024-08-01
-
Hierarchical carbon fiber composites with radially aligned carbon nanotubes : preservation of in-plane tensile properties
Hierarchical carbon-nanotube (CNT)-based composites have significant potential to expand the performance and functionality of aerospace composite structures. Notably, circumferentially aligned CNT arrays have previously been grown on woven alumina filaments to form a "fuzzy fiber" reinforced …
-
Micro-computed tomography for interlaminar analysis, void quantification, and feature localization in carbon fiber composites
… subjectivity compared to extant CT analysis of composites. The developed tools extract micron-scale morphological information in three dimensions for laminated advanced composite structures, specifically unidirectional prepreg aerospace-grade carbon fiber reinforced plastic (CFRP) laminated …
-
The fabrication of carbon-fiber composites by aqueous suspension prepregging with larc-tpi and peek
… aqueous suspension of polymer powder and AS-4 carbon fibers. The prepregging, consolidation, and laminate evaluation procedures are described in this report. The need and importance of a dispersing and binding agent and its interactions with the composite matrix are assessed. A …
-
Experimental Investigation Of Fatigue Behavior Of Carbon Fiber Composites Using Fully-Reversed Four-Point Bending Test
<p>Carbon fiber reinforced polymers (CFRP) have become an increasingly notable material for use in structural engineering applications. Some of their advantages include high strength –to–weight ratio, high stiffness-to-weight ratio, and good moldability. Prediction of the fatigue life …
-
At the Intersection of Bistability and Elastic Instability: Switching and Locking Structures using Asymmetric Carbon Fiber Composites
… switchable systems. In our interest, Asymmetric Carbon-Fibre Reinforced Polymer (CFRP) laminates, have shown bistability, i.e., they have two stable equilibria or states that arise due to thermal imbalances during the curing process. This forces the laminate to exhibit two mutually perpendicular …
-
X-ray Micro-Computed Tomography and Deep Learning Segmentation of Progressive Damage in Hierarchical Nanoengineered Carbon Fiber Composites
Advanced composite laminates comprised of carbon (micro) fiber reinforced polymer (CFRP) have become widespread in modern high-performance aerospace structures, providing high, tailorable mass-specific stiffness and strength. However, while underpinning such performance benefits, CFRP …
-
An Investigation of the Structure-Property Relationships for High Performance Thermoplastic Matrix, Carbon Fiber Composites with a Tailored Polyimide Interphase
… was used to fabricate PEEK and PPS matrix composites with polyimide interphases of tailored properties. The structure-property relationships of Ultem-type polyimide and BisP-BTDA polyimide which were made from various water soluble polyamic acid salts were studied. The molecular weight of …
-
From Surface Activation to Delamination Resistance: Nitrogen Atmospheric Pressure Plasma Jet Effects on Unidirectional Carbon Fiber Composites for Sustainable Mobility Applications
L'abstract è presente nell'allegato / the abstract is in the attachment
-
A numerical and experimental investigation of the effects of thermal history on the structure/property relationship of PPS/carbon fiber composites
… properties of (polyphenylenesulfide) PPS/carbon fiber composites. Three thermal treatments were employed in this study: isothermal crystallization from the melt at 140,160,180,200, and 220°C, quenching from 315° C and then annealing at 160 and 200° C, and nonisothennal crystallization from …
-
An Investigation of the Tensile Strength and Stiffness of Unidirectional Polymer-Matrix, Carbon-Fiber Composites under the Influence of Elevated Temperatures
… thought that the unidirectional strength in the fiber direction of fiber dominated composites was not influenced by the matrix material. As long as the fiber was not affected then the strength would remain. However this thesis will challange that belief. The unidirectional strength in the fiber …
-
Synthesis and Characterization of High Performance Polymers for Gas Separation and Water Purification Membranes and as Interfacial Agents for Thermplastic Carbon Fiber Composites
… and as interfacial agents for thermoplastic carbon fiber composites. Two methods for improving the gas transport properties (for H2/CO2 separation) of a tetraaminodiphenylsulfone (TADPS)-based polybenzimidazole were investigated. Low molecular weight poly(propylene carbonate) (PPC) and …
Page 1 of 3