Interfacial sensitivity of transverse and shear tests for CF/EP composites using flat and tubular specimens
- Univ. of Kaiserslautern (Germany). Institute for Composite Materials
The aim of this study was to assess the interface-relevance (IR), i.e. interface-dependent mechanical parameters in composites with a well-defined variation in the fiber/matrix adhesion. Transverse and shear properties of flat and tubular specimens were determined in different mechanical tests. A further scope of this study was to check how the interface (fiber/matrix bond quality) affects the mechanical response using unidirectional (UD) flat composite laminates and hoop-wound tubular specimens. In detail, transverse tensile, three-point bending, short beam shear (SBS), transverse Iosipescu and direct shear tests were performed on carbon fiber (CF)/epoxy (EP) matrix UD composite plates. In all the aforementioned tests the failure initiation (and propagation as well) is controlled by a rather complex three-dimensional stress state which affects the mechanical response of the composites to a great extent. In order to overcome this difficulty, tensile and torsion tests were conducted on hoop filament-wound tubes. In this case the failure onset is relied with pure tensile and shear stresses, respectively. In general, torsion and transverse tensile testing of tube specimens seems to reveal most reliable strength values, whereas the laminate test methods may provide controversial results. The parameter ``interface relevance`` (IR) has been introduced as a measure for reflecting the interfacial sensitivity of the above mentioned mechanical tests. IR proves to be independent of the loading configuration and strength level, at least for transverse testing of laminates. Referring to the shear tests, SBS is most likely to yield reasonable results of considerable IR.
- OSTI ID:
- 89838
- Report Number(s):
- CONF-9409291-; ISBN 1-56676-220-0; TRN: IM9536%%268
- Resource Relation:
- Conference: 9. technical conference of the American Society for Composites, Newark, DE (United States), 20-22 Sep 1994; Other Information: PBD: 1994; Related Information: Is Part Of Proceedings of the American Society for Composites: Ninth technical conference; PB: 1319 p.
- Country of Publication:
- United States
- Language:
- English
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