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Interfacial strength development in thermoplastic resins and fiber-reinforced thermoplastic compositesAn experimental program to develop test methods to be used to characterize interfacial (autohesive) strength development in polysulfone thermoplastic resin and graphite-polysulfone prepreg during processing is reported. Two test methods were used to examine interfacial strength development in neat resin samples. These included an interfacial tension test and a compact tension (CT) fracture toughness test. The interfacial tensile test proved to be very difficult to perform with a considerable amount of data scatter. Thus, the interfacial test was discarded in favor of the fracture toughness test. Interfacial strength development was observed by measuring the refracture toughness of precracked compact tension specimens that were rehealed at a given temperature and contact time. The measured refracture toughness was correlated with temperature and contact time. Interfacial strength development in graphite-polysulfone unidirectional composites was measured using a double cantilever beam (DCB) interlaminar fracture toughness test. The critical strain energy release rate of refractured composite specimens was measured as a function of healing temperature and contact time.
Document ID
19880003167
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Howes, Jeremy C.
(Virginia Polytechnic Inst. and State Univ. Blacksburg, VA, United States)
Loos, Alfred C.
(Virginia Polytechnic Inst. and State Univ. Blacksburg, VA, United States)
Date Acquired
September 5, 2013
Publication Date
September 1, 1987
Subject Category
Composite Materials
Report/Patent Number
CCMS-87-15
NASA-CR-181525
NAS 1.26:181525
VPI-E-87-20
Accession Number
88N12549
Funding Number(s)
CONTRACT_GRANT: NAG1-343
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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