Fibre orientation distribution

The microstructure of all mouldings was characterised by determining fibre content (weight and volume fraction), average fibre dimensions (diameter and length), fibre length distribution and fibre orientation distribution. 

Ideally the laminate of the part to be joined should be of balanced svmmptriral spctinn with fibre orientations distributed thronoh the... 

The complexity of geometrical models of semi-regular structures, e.g. yarns and random fibrous assembhes such as non-wovens,can be explained by a high level of randomness in their structure and a large number of elements, usually individual fibres that have to be considered. Furthermore, it is necessary to consider that fibres do not overlap one another, yet at the same time provide the required fibre orientation distribution and fibre packing density. 

It is anisotropic, both in terms of its stmcture and properties, due to both fibre ahgnment (ie, the fibre orientation distribution) and the arrangement of the bonding points in its stmcture. 

The structure and properties of a nonwoven fabric are determined by, in addition to the properties of the constituent fibres and bonding materials, the stmctural architecture of fibres, bonding segment structure, and their distributions. The methods for the measurement of the key structural parameters of nonwoven fabrics discussed in this section include fabric thickness, mass per unit area, fabric density, fabric uniformity fabric porosity, pore size and pore size distribution, fibre orientation distribution, bonding segment structure, and their distributions. 

A.2 Measurement of the fibre orientation distribution using image analysis... 

O.J. Kallmes, Techniques for determining the fibre orientation distribution throughout the thickness of a sheet, Tappi J 52 (1969) 482—485. 

B. Stenemur, Method and device for monitoring fibre orientation distributions based on light diffraction phenomenon, Int Nonwovens J 4 (1992) 42—45. 

P.P. Tsai, R.R. Bresse, Fibre orientation distribution from electrical measurements. Part 1,... 

P.P. Tsai, R.R. Bresse, Fibre orientation distribution fiom electrical measurements. Part 2, instrument and experimental measurements, Int Nonwovens J 3 (4) (1991) 32. Chaudhray MM. [M.Sc. Dissertation]. University of Manchester 1972. 

By comparison, the influence of the fibre orientation distribution on the interlaminar shear modulus G23 is small almost identical values are obtained for both materials. 

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