The principles of dielectric measurements for in situ monitoring of composite processing

Mijović, Jovan; Kenny, J. M.; Maffezzoli, Alfonso; Trivisano, A.; Bellucci, Francesco; Nicolais, L.

doi:10.1016/0266-3538(93)90109-t

Cited by 95 publications

(58 citation statements)

References 52 publications

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“…The curing process has been identified as the most critical and costly stage in the manufacturing of composite structures. Mijovi c et al (1993) [29] have argued that a significant aspect of composite processing still in need of fundamental research relates to the development and implementation of a special class of in-situ sensors capable of relaying fundamental information about the mechanism and rate of chemical reactions during cure. Joshi et al (1999) [30] illustrate the problem of effective control through the example of the curing of thermosetting resins as an exothermic reaction.…”

Section: Process Monitoringmentioning

confidence: 99%

Manufacturing processes for composite materials and components for aerospace applications

McIlhagger

Archer

McIlhagger

2015

Polymer Composites in the Aerospace Industry

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Section: Process Monitoringmentioning

confidence: 99%

Manufacturing processes for composite materials and components for aerospace applications

McIlhagger

Archer

McIlhagger

2015

Polymer Composites in the Aerospace Industry

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“…For example, conductivity measurements have been used for online monitoring of emulsion polymerisations [16], where the stability of particles after the addition of a surfactant was assessed. Dielectric measurement, coupled with more traditional techniques such as viscosity [17] to measure the curing degree in foaming-controlled additives, and temperature [18] to monitor the particle population available for coagulation, still remains as one of the most promising techniques for non-destructive testing and diagnostic [19]. This paper's objective is twofold:…”

Section: Manuscript Click Here To Download Manuscript: Measurement Ofmentioning

confidence: 99%

Identification of formation stages in a polymeric foam customised by sonication via electrical resistivity measurements

Torres-Sánchez

Corney

2008

J Polym Res

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nucleation, growth, packing, stiffening, solidification) some of which are known to be more sensitive to external inputs than others. Consequently, precise detection of the start and end points of each of the polymerisation stages would enable the fine control of material properties such as porosity.The development of such process control can only be pursued if those sensitive stages can be clearly distinguished during the manufacture process. This paper reports how an electrical resistivity tracking method was used to assess the differences in the foaming processes when ultrasound was irradiated to polymeric melts undergoing foaming. The electrical resistivity tracking method is also appraised with regard to its suitability to accurately identify the formation stages in the foam, as described by other authors. The polymerisation reactions associated with foam formation have distinct stages (i.e. nucleation, growth, packing, stiffening, solidification) some of which are known to be more sensitive to external inputs than others. Consequently, precise detection of the start and end points of each of the polymerisation stages would enable the fine control of material properties such as porosity. The development of such process control can only be pursued if those sensitive stages can be clearly distinguished during the manufacture process. This paper reports how an electrical resistivity tracking method was used to assess the differences in the foaming processes when ultrasound was irradiated to polymeric melts undergoing foaming. The electrical resistivity tracking method is also appraised with regard to its suitability to accurately identify the formation stages in the foam, as described by other authors.

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“…Various sensor techniques have been pursued to monitor the manufacturing process, including dielectric [4,5] and ultrasonic [6] measurements. Some of these have been directed toward carbon-carbon brake disks [6] and some to medical applications [7,8].…”

Section: Introductionmentioning

confidence: 99%

Acoustic emission technique for monitoring the pyrolysis of composites for process control

Tittmann

Yen

2008

Ultrasonics

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The principles of dielectric measurements for in situ monitoring of composite processing

Cited by 95 publications

References 52 publications

Manufacturing processes for composite materials and components for aerospace applications

Manufacturing processes for composite materials and components for aerospace applications

Identification of formation stages in a polymeric foam customised by sonication via electrical resistivity measurements

Acoustic emission technique for monitoring the pyrolysis of composites for process control

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