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Assessment of strains along fiber surface features in graphite/epoxy composites loaded in compression

Tipo de material: TextoTextoSeries ; Composites Science and Technology, 59(10), p.1589-1596, 1999Trabajos contenidos:
  • Narayanan, S
  • Schadler, L.S
Tema(s): Recursos en línea: Resumen: Kink-band formation in graphite/epoxy composites is not well understood. In this study we have monitored ®ber failure before and during kink-band formation. It was found that several surface features and types of breaks develop during the damage pro-gression before kink-bands form. The strain around these surface features was measured by means of micro-Raman spectroscopy (MRS). In order to determine the validity of using the strain pro®les to calculate the interfacial shear stress (ISS)values, it was also determined whether the various features represented ®ber breaks. The reliability of MRS to obtain strain maps in these composites using the ®ber as an internal strain gage as well as the validity of obtaining ISS values from the strain pro®les is discussed.
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Kink-band formation in graphite/epoxy composites is not well understood. In this study we have monitored ®ber failure before and during kink-band formation. It was found that several surface features and types of breaks develop during the damage pro-gression before kink-bands form. The strain around these surface features was measured by means of micro-Raman spectroscopy (MRS). In order to determine the validity of using the strain pro®les to calculate the interfacial shear stress (ISS)values, it was also determined whether the various features represented ®ber breaks. The reliability of MRS to obtain strain maps in these composites using the ®ber as an internal strain gage as well as the validity of obtaining ISS values from the strain pro®les is discussed.

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