The influence of bending-torsional coupling on the buckling load of general orthotropic, midplane symmetric and elastic plates

The influence of bending-torsional coupling on the buckling load of general orthotropic, midplane symmetric and elastic plates has been studied. First this effect has been analysed for the case of infinitely long plate strips, resulting in approximate analytical solutions, which can be presented graphically for the entire range of the elastic...

Residual strength of (0, ±45)s and (±45, 0)s carbon/epoxy laminates

Environmental fatigue crack propagation in metal/composite laminates: interim report no. 1

Plight simulation fatigue crack propagation tests with gust spectrum loading were carried out on 2024-T3/carbon-epoxy, 7475-T761/carbon-epoxy and Ti-6Al-4V/carbon-epoxy laminates with nominal weight savings of 30% as compared to equivalent 2024-T3 panels. The performance of the 2024-T3/ carbon-epoxy laminates was much superior to those of the...

Determination of the thermal conductivity of carbon fibre reinforced plastic sheet material

A finite element model to study the buckling behaviour of general orthotropic, midplane symmetric and elastic plates

A finite element model has been developed, which incorporates the bending-torsional coupling effect, as it occurs in general orthotropic, midplane symmetric, elastic plates in order to analyse its influence on the buckling behaviour of such plates. Some results have been compared with known exact and approximate solutions.

Residual strength properties of carbon/epoxy composite material

Fatigue tests on unidirectional Ca/ep composite material have been performed to investigate whether previous fatigue loading did influence the residual static strength. Residual strength tests were carried out on (0, ± 45)2s and (± 45)2s laminates, while for the (O, ± 45)2s laminate the influence of previous tensile fatigue loading on the...

Analysis of the NLR airports pollution dispersion model on sensitivity for meteorological parameters and on source modeling

The NLR airports pollution dispersion model is analysed with regard to sensitivity for meteorological parameters and the modeling of the sources of pollution (i.e. airplanes). It is found that the weather resolution of the model is satisfactory in view of the present standards of meteorological measurement. Atmospheric stability (Pasquill class)...

On the propagation of a disturbance in the bed composition of an open channel

The transport of a sand mixture is more complicated than that of uniform sand, because the transport velocity of a grain is varying with the grain size. And in case of sand mixture, the change of composition of mixture in addition to the change of bed height according to the change of boundary conditions occurs. It is very important from the...

Rate effects on residual strength of flawed structures and materials

The literature is reviewed with respect to: - tests conducted to investigate crack re-initiation under dynamic load and arrest of a running crack - metallurgical sources of rate effects - available data for aerospace engineering materials - mechanical sources of rate effects, i.e. dynamic crack tip stresses and kinetic energy effects Conclusions...

Tensile failure of unidirectional composite materials

Effects of Slope Roughness on Wave Run-up on Composite Slopes

A comprehensive study of the wave run-up phenomena on single and composite slopes was conducted in order to determine the effects of slope roughness on regular and irregular wave run-up on composite sections, to determine the effects of slope roughness on the velocity distribution in the uprush zone, to investigate the energy loss in the uprush...