Print Email Facebook Twitter Fracture characteristics of carbon and aramid unidirectional composites in interlaminar shear and open hole tensile tests. Title Fracture characteristics of carbon and aramid unidirectional composites in interlaminar shear and open hole tensile tests. Author Moss, A.C. 't Hart, W.G.J. Institution National Aerospace Laboratory NLR Date 1986-08-26 Abstract This investigation examined carbon/epoxy and aramide/epoxy composites in interlaminar shear and in open-hole tensile tests at 90 to the unidirectional fibre orientation. Epoxy resin was also tested under tension. Photomicroscopy and the S.E.M. were used to study the fracture surfaces. Wet tests were performed to investigate the influence of moisture absorption on the strength of the composites. In the interlaminar shear tests shear crippling and interlaminar delamination were seen for most of the specimens. The value of the interlaminar shear strength did not change with the water absorption. In the open-hole tensile tests the moisture uptake increased the local plasticity of the resin and the size and number of voids in the material. In both the composites the interfacial bounding seemed to decrease owing to water absorption. Kink bands were found on the compression sides of the aramid fibres in both the wet and dry specimens. Subject Surface cracksMoisture contentMicrostructureCrack propagationBend testsFractographyFiber reinforced compositesEpoxy matrix compositesShear strengthTensile strenghtFailure modesSolid-solid interfacesKevlar (trademark To reference this document use: http://resolver.tudelft.nl/uuid:b0b28687-c8fc-48ac-9074-59af41b31907 Publisher Nationaal Lucht- en Ruimtevaartlaboratorium Access restriction Campus only Source NLR-TR 86083 U Part of collection Aerospace Engineering Reports Document type report Rights (c)1986 National Aerospace Laboratory NLR Files PDF NLR_TR_86083_U.pdf 20.02 MB Close viewer /islandora/object/uuid:b0b28687-c8fc-48ac-9074-59af41b31907/datastream/OBJ/view