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Showing 1 to 11 of 11 for “"cure monitoring"”.
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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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In-situ cure monitoring of epoxy resin systems
… develop novel 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 …
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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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Miniature Fiber Optic Viscoelasticity Sensor for Composite Cure Monitoring
… during processing to permit control of the cure cycle based on measurements of the material's internal state. While sensors have been demonstrated that infer the material state indirectly through measurements of acoustic impedance, electrical impedance, or refractive index, sensors that …
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Ultrasound detection using singlemode optical fibers with applications to epoxy cure monitoring
The state of cure of epoxies is an important issue in the manufacture of graphite epoxy composites used in aerospace structures. Variations in the initial state and process used to cure the epoxy resin in a composite material lead to variations in the mechanical properties of the part manufactured …
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In-situ cure monitoring and characterization of graphite/epoxy composites using fiber optics and ultrasonics
… multiple plies into the desired shape, and then cured in an autoclave with simultaneous application of proper heat and pressure. The knowledge of the cure process is very important in order to obtain fully cured and high-quality composites. In-situ sensors capable of monitoring the change of …
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Production of controlled networks and morphologies in toughened thermosetting resins using real-time, in-situ cure monitoring
… (FTNIR) fiber optic sensor was developed and the cure of a model toughened cyanate as well as a commercial paste adhesive was followed with this sensor In the near-infrared. The design was suitable for many applications. A mold was designed to incorporate the fiber sensor for composite …
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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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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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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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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 …