A unified periodical boundary conditions for representative volume elements of composites and applications

Meso-FE modelling of textile composites: Road map, data flow and algorithms

On selection of repeated unit cell model and application of unified periodic boundary conditions in micro-mechanical analysis of composites

Design optimization and manufacture of hybrid glass/carbon fiber reinforced composite bumper beam for automobile vehicle

Materials having a negative Poisson9s ratio (auxetic) get fatter rather than thinner when uniaxially stretched. This phenomenon has been often explained through models that describe how particular geometric features in the micro or nanostructure of the material deform when subjected to uniaxial loads. Here, a new model based on scalene rigid triangles rotate relative to each other will be presented and analysed. It is shown that this model can afford a very wide range of Poisson9s ratio values, the sign and magnitude of which depends on the shape of the triangles and the angles between them. This new model has the advantage that it is very generic and may be potentially used to describe the properties in various types of materials, including auxetic foams and their relative surface density. Specific applications of this model, such as a blueprint for a system that can exhibit temperature-dependent Poisson9s ratios, are also discussed.

/pdf/on-the-auxetic-properties-of-generic-rotating-rigid-1536jm2g3i.pdf

On the auxetic properties of generic rotating rigid triangles

The invention provides composite components, structures and method for producing composite components. A composite component has a negative effect Poisson's ratio and comprises a first component and a second component. The first component and the second component extend longitudinally relative to an axis, the first component being provided around the second component through one or more turns which are spaced longitudinally relative to the axis. A variation in the tensile load on the first component causes the radial position of the second component relative to the axis to vary.

Composite materials and structures

The invention provides composite components, structures and methods for producing composite components, a composite component having a negative effective Poissons ratio, the composite component including a first component and a second component, the first component and the second component extending longitudinally relative to an axis, the first component being provided around the second component through one or more turns, the one or more turns being spaced longitudinally relative to the axis, variation in the tensile load on a first component causing the radial position of the second component relative to the axis to vary.

Improvements in and relating to composite materials and structures

Improvements in composite materials and bodies

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Composite materials and structures

Improvements in and relating to composite materials and structures

Improvements in composite materials and bodies