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Off-axis tensile properties and fracture in a unidirectional graphite/polyimide composite (Celion 6000/PMR 15)Tensile properties of unidirectional Celion 6000 graphite/PMR 15 polyimide composites prepared by hot molding and cold molding processes were measured at room temperature and 316 C, the upper use temperature of the polyimide resin, at both 45 and 90 deg to the fiber axis. The resulting fractures were characterized by scanning electron microscopy and materialographic techniques. Variation in tensile properties with processing history occurred in the elastic modulus and strain to failure for specimens loaded at 90 deg at 316 C, and in the fracture stress, and hence the in-plane shear stress, for those loaded at 45 deg at room temperature. Significant plastic deformation was observed in the 45 deg orientation at 316 C for material produced by both processing methods. In general, fracture occurred by both failure within the matrix and at the fiber-matrix interface; the degree of interfacial failure increased with temperature. Secondary cracking below the primary fracture surface was also observed.
Document ID
19840060766
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Harper, J.
(NASA Lewis Research Center Cleveland, OH, United States)
Whittenberger, J. D.
(NASA Lewis Research Center Cleveland, OH, United States)
Hurwitz, F. I.
(NASA Lewis Research Center Cleveland, OH, United States)
Date Acquired
August 12, 2013
Publication Date
July 1, 1984
Publication Information
Publication: Polymer Composites
Volume: 5
ISSN: 0272-8397
Subject Category
Composite Materials
Accession Number
84A43553
Distribution Limits
Public
Copyright
Other

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