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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 35 for “"degree of cure"”.
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A finite element cure model and cure cycle optimization for composite structures
A one-dimensional cylindrical cure model was developed to describe the curing process of an axisymmetric filament wound composite structure. For a specified cure cycle, the cure model can be used to calculate the temperature distribution, the degree of cure of the resin, and the resin viscosity …
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In situ curing of polymeric composites via resistive heaters comprised of aligned carbon nanotube networks
The widespread application of polymer matrix composites (PMCs) has encouraged the use of nanofibers, especially carbon nanotubes (CNTs), to concurrently enhance the physical properties of such composites while adding multi-functionality. However, current-generation manufacturing routes of PMCs have …
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Measurement of resin pressure in composite laminates during cure
A promising method of measuring the resin pressure within a composite laminate during processing has been developed. This method can be used to investigate the control of voids, or resin flow and laminate compaction in several composite material processing methods such as ACND, hot press curing and …
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Process-induced viscoelastic residual stress analysis of graphite/epoxy composite structures
In this research the effect of viscoelastic behavior of thermoset matrix fiber-reinforced composites on process-induced residual stresses was investigated. The material selected for study was AS4/3501-6, a commercial prepreg system manufactured by Hercules, Inc. To investigate the cure-dependent …
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Curing Characteristics of Photopolymer Resin With Dispersed Glass Microspheres in Vat Polymerization 3D Printing
The curing characteristics of photopolymer resin determine the relationship between the vat polymerization (VP) process parameters and the layer thickness, geometric accuracy, and surface quality of the 3D printed specimen. Dispersing filler material into the photopolymer resin changes its curing …
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Analysis of Cyanate Ester Resins and Graphite Fabric for Use in Resin Film Infusion Processing
The objective of this investigation was to characterize two cyanate ester resins and a eight harness satin (8HS) graphite fabric for use in resin film infusion (RFI) processing. Two cyanate ester resin systems were characterized to determine their cure-kinetics, and viscosities during cure. A 8HS …
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An infiltration/cure model for manufacture of fabric composites by the resin infusion process
A one-dimensional infiltration/cure model was developed to simulate fabrication of advanced textile composites by the resin film infusion process. The simulation model relates the applied temperature and pressure processing cycles, along with the experimentally measured compaction and permeability …
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Effect of carbon nanoparticle addition on epoxy cure
The thesis reports studies of cure kinetics and the glass transition temperature advancements of three commercial epoxy resin systems: MY 750 / HY 5922 (Vantico), MTM 44 -1 (ACG) and 8552 (Hexcel Composites). This investigation was conducted with the utilisation of Differential Scanning Calorimetry …
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Dynamic stiffness and damping prediction on rubber material parts, FEA and experimental correlation
The final objective of the present work is the accurate prediction of the dynamic stiffness behaviour of complex rubber parts using finite element simulation tools. For this purpose, it becomes necessary to perform a complex rubber compound material characterisation and modelling work; this needs …
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Design,formulation and synthesis of UV/Thermal dual cure, bio-based polyurethane coatings
… as a primary component. To overcome some of the limitations associated with soft and flexible structure of soy-based polyols, the resin has been designed with two unique set of functional groups –OH and acrylate, as a means of crosslinking sites. Such resin system can be cured by two …
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Cure Kinetics and Processing Parameters of Neat and Reinforced High Performance Epoxy Resins: Evaluation of Techniques
… equation parameters for the curing reaction of a commercial glass fiber reinforced high performance epoxy prepreg composed of the tetrafunctional epoxy tetraglycidyl 4,4-diaminodiphenyl methane (TGDDM), the tetrafunctional amine curing agent 4,4-diaminodiphenylsulfone (DDS) and an ionic …
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In-Situ Measurement of Resin Shrinkage for Aerospace Components
… resin shrinkage during curing with the help of digital image correlation (DIC) instrumented on a specially designed autoclave with borosilicate viewports. The images of the resin sample are captured at regular intervals with the help of DIC to measure the displacement and strains during the …
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Experimental and theoretical investigation of the curing process of thermosetting composite structures with angle-bend
The effect of existing cure cycles and processes on the quality of thermoset composite parts with angle-bend is presented. A 2-D finite difference scheme was developed to model the processing of arbitrary shaped composite parts. The formulation includes heat transfer, viscosity, extent of cure, and …
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Verification of a two-dimensional infiltration model for the resin transfer molding process
… finite element model for the infiltration of a dry textile preform by an injected resin has been verified. The model, which is based on the finite element/control volume technique, determines the total infiltration time and the pressure increase at the mold inlet associated with the RTM …
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Material process monitoring with optical fiber sensors
… this work is based on the need to monitor the cure and inservice health of composite materials. We describe the continuation of an effort to design a multi-functional fiber optic sensor which can be embedded in polymeric composite laminates for monitoring the degree of cure during its …
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The Influence of Extended Cure on Mechanical Performance of Aerospace-Grade Film Adhesives
… manufacturers to composite designs. As the use of epoxy film adhesives become more prevalent, it is important to characterize the thermal and mechanical properties of the adhesive after exposure to various manufacturing conditions. Prior studies suggest that thermal characteristics and …
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Cure characterization and process modeling of soy-based composites
"This work deals with cure characteristics of soy-based resin system, fabrication of pultruded soy-based composites, and analysis of flexible polymeric foams. In the first part of this work, the cure kinetics and rheology of the soy-based resin system were studied. The cure kinetics models of the …
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A model of the winding and curing processes for filament wound composites
The goal of this investigation was to develop a two-dimensional model which describes the winding and curing processes of filament wound composite structures. The model was developed in two parts. The first part is the cure model which relates the cure temperature, applied at the boundaries of the …
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An Improved Method for the Fracture Cleavage Testing of Adhesively-Bonded Wood
This work describes the development of an improved mode I fracture testing procedure for adhesively-bonded wood, and demonstrates the sensitivity of this approach. The two significant improvements were: 1) the use of the flat double cantilever beam (DCB) geometry, which has been uncommon for wood …
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Thermally-assisted frontal polymerization for rapid curing of fiber-reinforced polymer composites
… composites (FRPCs) are widely used in a variety of applications owing to their excellent specific mechanical properties, chemical stability, and fatigue resistance. However, the state-of-the-art technologies for manufacturing FRPCs are intensive in terms of time and energy, generate a significant …
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