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Insitu measurement and control of processing properties of composite resins in a production toolAn in situ measuring technique for use in automated composite processing and quality control is discussed. Frequency dependent electromagnetic sensors are used to measure processing parameters at four ply positions inside a thick section 192-ply graphite-epoxy composite during cure in an 8 x 4 in. autoclave. Viscosity measurements obtained using the sensors are compared with the viscosities calculated using the Loos-Springer cure process model. Good overall agreement is obtained. In a subsequent autoclave run, the output from the four sensors was used to control the autoclave temperature. Using the 'closed loop' sensor controlled autoclave temperature resulted in a more uniform and more rapid cure cycle.
Document ID
19880055180
Document Type
Conference Paper
Authors
Kranbuehl, D. (College of William and Mary Williamsburg, VA, United States)
Hoff, M. (College of William and Mary Williamsburg, VA, United States)
Haverty, P. (College of William and Mary Williamsburg, VA, United States)
Loos, A. (Virginia Polytechnic Institute and State University Blacksburg, United States)
Freeman, T. (NASA Langley Research Center Hampton, VA, United States)
Date Acquired
August 13, 2013
Publication Date
January 1, 1988
Subject Category
MECHANICAL ENGINEERING
Meeting Information
Materials - Pathway to the future(Anaheim, CA)
Funding Number(s)
CONTRACT_GRANT: NAG1-237
Distribution Limits
Public
Copyright
Other