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Sandwich beam compressive test methodTests presented show that the sandwich beam in four-point bending could be used to obtain reliable compressive elastic constants for graphite/polyimide laminates although some difficulties were encountered measuring composite compressive strengths. Data were obtained for ultimate stress, ultimate strain, Young's modulus, and Poisson's ratio values in 117K, room temperature, and 589K test environments for the HTS1/PMR-15 material system. A total of 36 compressive tests on various laminates were performed. Also, 24 tensile tests on the same laminate orientations were performed to obtain input to the analytical portion of this program. A portion of the beam test section was analyzed using a linear elastic finite element computer program to predict the stress state in the graphite/polyimide composite. The influence of the honeycomb core of this stress state was analytically determined.
Document ID
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Shuart, M. J.
(NASA Langley Research Center Hampton, VA, United States)
Date Acquired
August 9, 2013
Publication Date
August 1, 1979
Publication Information
Publication: Graphite/Polyimide Composites
Subject Category
Composite Materials
Accession Number
Distribution Limits
Work of the US Gov. Public Use Permitted.

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