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Free vibration analysis of composite stiffened shell panels has been carried out for the first time. As there is no published literature available on the problem, the finite element technique has been applied using two elements, namely the nine-noded Lagrangian element and the heterosis element,...
The compression strength of a stitched and a toughened matrix graphite/epoxy composite was determined and compared to a baseline unstitched untoughened composite. Two different layups with a variety of test lengths were tested under both ambient and hot/wet conditions. At longer gage lengths...
Ability to determine the individual stresses photoelastically in orthotropic composites from isochromatic data, but without employing isoclinics or isopachics, is developed and demonstrated. This new capability is achieved by combining isochromatic information, complex stress functions and...
This paper compares the impulse (shock) loading response of glass reinforced polymer (GRP) laminates fabricated by the wet hand lay-up and resin transfer moulding (RTM) techniques. The GRP prepared by the hand lay-up technique contained a large number of microstructural defects whereas the GRP...
The static and flexural fatigue characteristics of foam cored polymer composite sandwich beams are investigated. The skins of the beams are made from hybrid glass-aramid fibres set in epoxy resin and the core materials are linear and cross-linked polymer foams. The applied load in a ten-point...
A finite element analysis was performed to determine the influence of microstructural inhomogeneities on the compressive and shear strength of 2-D carbon-carbon laminates. In particular, the effects of amplitude and distribution of the fiber bundle crimps, and lengths and distribution of the...
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