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Graphite/epoxy specimens with shrinkage controlled matrix were manufactured and tested in uniaxial tension. The resin used was Epon 813 with dinorbornene spiro orthocarbonate (DNSOC) as the expanding monomer in quantities of 0%, 5%, and 10% by weight. Two different laminates were studied. Unidirectional laminates, 4, were tested to determine the effects on longitudinal, fiber-dominated properties. Cross-ply laminates, [0/902]8, were tested to determine the effects on transverse, matrix-dominated properties. The key effects of the addition of DNSOC are the reduction of the longitudinal tensile ultimate strength and the delay of the onset of cracks by reducing the average residual stress.
Associate professor, Aerospace Engineering, University of Maryland, College Park, MD
Research assistant, Boeing Defense and Space Group, Helicopters Division, Philadelphia, PA
Stock #: CTR10416J