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Title: The rheology of pastes
Author: Brown, Alexander Rainy
Awarding Body: University of Aberdeen
Current Institution: University of Aberdeen
Date of Award: 2006
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The behaviour of paste is complex.  It has many unusual properties that do not fit with other engineering materials.  These can be linked to the volume effects that occur as the material is sheared. A multi-phase model based on a soil mechanic approach has been developed to consider the particle, liquid and gas components.  The volume is allowed to change during shearing and links these effects to the shear stress through pore fluid pressure and surface tension.  There is also a movable reference strain to allow the model the ability to simulate both cyclic and monotonic deformations in one system. Constrained pressure tests were conducted over a fixed strain amplitude cyclic deformation.  These were conducted in a series to consider the effects of strain rate, amplitude and pressure in a paste.  They were then analysed visually and statistically to find which of the variables were significant to the stress-strain response in paste. A further series of tests carried out with an increasing amplitude cyclic test.  This test was simpler but allowed a series of different pastes to be analysed without attempting to control the pore pressure in the materials.  A number of different responses were noted and a fuller picture of paste reaction was developed. Finally, the material model was matched to physical tests to evaluate the model’s ability to fit to different paste responses.  This was completed successfully with the use of an optimisation algorithm.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available