Suppression of interlaminar damage in carbon/epoxy laminates by use of interleaf layers
- Shonan Inst. of Tech., Kanagawa (Japan). Dept. of Materials Science Ceramic Technology
Carbon fiber reinforced plastics (CFRP) have been widely used as a structural material. In general, fiber orientation angle of each lamina in these laminates is variously chosen in order to taylor a material which meets the particular requirement for the material properties in arbitrary direction of laminate. Quasi-isotropic lamination, in which the laminate consisted of laminae with fiber orientation of 0[degree], +45[degree], [minus]45[degree] and 90[degree] to loading axis, is most commonly employed in the actual application. However, quasi-isotropic carbon/epoxy laminates are known to develop the interlaminar stress concentrations near the free edge region. These laminates have a strong tendency to delaminate near the edges when subjected to axial in-plane loading. Such a free edge delamination under loading in the plane of the laminate is a unique problem to laminated composites. This paper summarizes the author's investigation which was performed to reduce the free edge interlaminar stresses in the laminate by incorporating interleaf films between plies and thus to improve the mechanical properties of these materials. In their previous work, the authors have shown that these laminates exhibit a high vibration damping capability. Loss factor values for these CFRP/interleaf laminates which were measured in cantilever beam tests, are 5 to 50 times as large as that for conventional CFRP. In this paper, discussion will be provided on the mechanical properties of the interleaved quasi-isotropic carbon/epoxy laminate, [0/[+-]45/90][sub s], with a special emphasis on the optimum design of interply locations to incorporate the interleaf films for the particular requirement such as static strength, elastic modulus, fatigue resistance and so on.
- OSTI ID:
- 6887456
- Journal Information:
- Scripta Metallurgica et Materialia; (United States), Vol. 31:8; ISSN 0956-716X
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
CARBON FIBERS
MECHANICAL PROPERTIES
COMPOSITE MATERIALS
REINFORCED PLASTICS
MECHANICAL TESTS
ORIENTATION
FIBERS
MATERIALS
MATERIALS TESTING
ORGANIC COMPOUNDS
ORGANIC POLYMERS
PETROCHEMICALS
PETROLEUM PRODUCTS
PLASTICS
POLYMERS
REINFORCED MATERIALS
SYNTHETIC MATERIALS
TESTING
360603* - Materials- Properties