Simulation of slump in plastic pipe extrusion

Article Abstract:

A mathematical model of self-weight flow in plastic pipes is given. The analysis assumes that the flow has a downward direction on a set of inclined plates. The molten polymer is a temperature-dependent Newtonian fluid and the inside surface of the pipe is at a constant extrusion temperature. Results obtained with the model agree with available commercial data. The model could employed in computing the optimum die eccentricity before producing plastic pipes. This could reduce costs involved in the trial and error determination of the die eccentricity.

Research, Evaluation, Fluid dynamics, Plastic pipes, Pipe, Plastic

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An inelastic constitutive equation of fiber reinforced plastic laminates

Article Abstract:

A model to describe the time-dependent inelastic deformation of unidirectional and symmetric angle-ply carbon fiber reinforced plastics (CFRP) has been developed. An extension of the kinematic hardening creep law of Malinin and Khadjinsky and the evolution equation of Armstrong and Frederick, describes the creep deformation. The model is able to describe time-dependent inelastic behaviour.

Physiological aspects, Observations, Kinematics, Reinforced plastics

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Influence of crosslinking on the plastic behaviour of amorphous polymers at large strains

Article Abstract:

Three linear and two crosslinked poly-(methyl methacrylate) (PMMA) polymers were examined in tension above and below the glass transition temperature. Strain-hardening was found to gradually decrease with temperature in the glassy state, although holding significant value in the rubbery state. These results were analyzed using the van der Giessen and Wu entropy-based statistical model.

Testing, Polymethylmethacrylate, Polymethyl methacrylate

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