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.
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Showing 1 to 20 of 1145 for “"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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Ocean fertilization : ecological cure or calamity
The late John Martin demonstrated the paramount importance of iron for microscopic plant growth in large areas of the world's oceans. Iron, he hypothesized, was the nutrient that limited green life in seawater. Over twenty years later, Martin's iron hypothesis is widely considered to be the major …
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Optimization of a resin cure sensor
Thesis (Elec.E)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1982.
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Cure studies of network-forming polyurethanes
… for the manufacture of polyurethanes. The cure characteristics of hydroxypropyl-cellulose and hydroxypropyl lignin (HPC and HPL, respectively) with polymeric methylene diphenyl diisocyanate (MDI) was studied via dynamic mechanical thermal analysis (DMTA). HPC/MDI and HPL/MDI resins flow at …
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Evaluation of Phenol Formaldehyde Resin Cure Rate
Cure time is often the bottleneck of composite manufacturing processes, therefore it is important to understand the cure of today's thermosetting adhesives. This research attempts to characterize the cure rate of two commercial phenol-formaldehyde adhesives. Two methods are used, parallel-plate …
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Cure Rate Model with Spline Estimated Components
… survivors who can be considered as permanently cured. The goals in these studies are to estimate the cure probability of the whole population and the hazard rate of the noncured subpopulation. The existing methods for cure rate models have been limited to parametric and semiparametric models. …
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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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Cure monitoring of composite materials using optical techniques
… use of this arrangement for further studies of cure monitoring of composite materials. Samples of 3.0 cm diameter and 1, 2, 4, 6, 8, 10 and 12 cm thickness were made and the interferometer waveforms were recorded in 10 min time intervals after the curing agent was mixed with the epoxy. …
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Minimizing uncertainty in cure modeling for composites manufacturing
The degree of cure and temperature are consistent variables used in models to describe the state of material behaviour development for a thermoset during cure. Therefore, the validity of a cure kinetics model is an underlying concern when combining several material models to describe a part forming …
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Curriculum and the Life Erratic: The Geographic Cure
… Children of Alcoholics, whom I call Geographic Cure Children, who cope with both fermented parenting (as I have termed it) AND transient schooling. Viewed by schools and school systems simply as “highly mobile” students, their frequent school changes tell only part of the story. Geographic Cure …
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In-situ cure monitoring of epoxy resin systems
… optical fibre sensors capable of monitoring the cure state of an epoxy/amine resin system. The sensors were of simple construction, consisting of an optical fibre from which the silicone cladding layer had been removed over a short length. This stripped length was embedded into the curing resin …
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Impartialist Ethics and Psychic Disintegration: A Talking Cure
<p>This dissertation deals with integrity understood as a state of the psyche. Its primary interlocutor is Professor Bernard Williams, and its point of departure is my interpretation of his Objection from Integrity to impartialist moral theories. Against Williams, I hope to show that the active …
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Compaction and Cure of Resin Film Infusion Prepregs
… et al.'s model has been employed to describe the cure and consolidation of prepregs used for resin film infusion. Resin kinetics, rheology, flow and fiber deformation are considered. Resin kinetics are simulated with an isothermal autocatalytic-1 type relation. The non-Newtonian viscosity of the …
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Epoxy matrix composite strain sensing and cure monitoring
… sensor is described, which permits the state of cure of an epoxy matrix to be monitored, when the sensor is embedded in a polymeric matrix composite. By using a glass rod with a retroreflecting end for the target fiber in the EFPI sensor, the intensity of the light reflected depends on the …
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Cure induced stress generation and viscoelasticity in polymer coatings.
… generated by a changing specific volume during cure, and stress-induced defects are undesirable. The goal of this research is to understand stress generation in UV irradiated coatings and to model stress generation and viscoelasticity seen during curing. Two new mathematical models were created …
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Measurement of resin pressure in composite laminates during cure
… several times with various initial degrees of cure of the resin. Experimental data were compared to the simulation predictions to determine the apparent initial degree of cure of the resin, and the resin pressure profiles from the experiments and the simulation with this resin initial degree of …
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