Publication

The role of fiber bundle interaction forces in non-isothermal compression molding of thermoplastic composites

Jan-Anders Edvin Maansson
2001
Journal Articles

Abstract

The non-isothermal flow during compression molding of thermoplastic-based composites having a planar, randomly oriented fiber structure has been investigated. Local interactions at the bundle-bundle level were measured and a constitutive equation was derived to describe the shear and squeeze flow of the composites. This equation contains only micro-mechanics-related variables, and accounts for the temperature dependence of the interaction forces. The flow of the material under industrial processing conditions can thus be related to the deformation mechanisms of the reinforcement structure at the scale of the individual fibers. Good agreement was obtained between the predicted and experimentally observed rheological behavior of the composites in both shear and squeeze flow. The use of this approach to analyze the industrial molding of complex-shaped parts is discussed.

Official source

https://infoscience.epfl.ch/entities/publication/38a7125b-535c-4412-8b72-de5de9ad5972

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Jan-Anders Edvin Maansson
2001
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/38a7125b-535c-4412-8b72-de5de9ad5972

About this result

Related concepts (32)

Composite material

A composite material (also called a composition material or shortened to composite, which is the common name) is a material which is produced from two or more constituent materials. These constituent materials have notably dissimilar chemical or physical properties and are merged to create a material with properties unlike the individual elements. Within the finished structure, the individual elements remain separate and distinct, distinguishing composites from mixtures and solid solutions.

Thermoplastic

A thermoplastic, or thermosoft plastic, is any plastic polymer material that becomes pliable or moldable at a certain elevated temperature and solidifies upon cooling. Most thermoplastics have a high molecular weight. The polymer chains associate by intermolecular forces, which weaken rapidly with increased temperature, yielding a viscous liquid. In this state, thermoplastics may be reshaped and are typically used to produce parts by various polymer processing techniques such as injection molding, compression molding, calendering, and extrusion.

Compression molding

Compression molding is a method of molding in which the molding material, generally preheated, is first placed in an open, heated mold cavity. The mold is closed with a top force or plug member, pressure is applied to force the material into contact with all mold areas, while heat and pressure are maintained until the molding material has cured; this process is known as compression molding method and in case of rubber it is also known as 'Vulcanisation'.

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The role of fiber bundle interaction forces in non-isothermal compression molding of thermoplastic composites

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