- Title
- Mechanical and dielectric relaxation studies of conveyor belt compounds to determine indentation rolling resistance properties
- Creator
- O'Shea, Jayne Isobel
- Relation
- University of Newcastle Research Higher Degree Thesis
- Resource Type
- thesis
- Date
- 2015
- Description
- Research Doctorate - Doctor of Philosophy (PhD)
- Description
- The power consumption of an overland conveying system can by predicted using a range of analytical and experimental methods. The main component of energy loss in an overland conveying system is due to the deformation of the bottom cover of the belt as it moves over each idler set. This loss is commonly labelled indentation rolling resistance. There are a number of existing analytical models which approximate the indentation rolling resistance of a belt conveying system. The accuracy of analytical models depends on the method of testing of a conveyor belts’ viscoelastic material properties. Due to the limitations and inconsistency of obtaining material properties using mechanical methods, it is becoming more common for viscoelastic behaviour to be represented by non-mechanical models, such as dielectric models. Electrical methods can lead to the same mathematical predictions as mechanical models, however, electric circuit experimental work is highly accurate and can be performed over a much greater frequency range than dynamic mechanical testing. This thesis examines mechanical methods of measuring the viscoelastic material properties of the bottom cover of a conveyor belt. The mechanical properties measured are used to evaluate the accuracy of a variety of mechanical analytical models. This thesis also examines various electrical methods of measuring the dielectric relaxation properties of the bottom cover of a conveyor belt. The mechanically measured viscoelastic properties are compared to the dielectric relaxation properties using well-establish mechanical and dielectric analogies. Dielectric indentation rolling resistance prediction models are developed by the author that can be used as analogies to the existing mechanical indentation rolling resistance models. The predictions from the mechanical and author developed dielectric rolling resistance models are compared to actual indentation rolling resistance data obtained from tests performed at the University of Newcastle on a purpose built test facility for the same rubber compounds for verification.
- Subject
- indentation rolling resistance; conveyor belt; viscoelastic properties; dielectric relaxation
- Identifier
- http://hdl.handle.net/1959.13/1310151
- Identifier
- uon:21991
- Rights
- Copyright 2015 Jayne Isobel O'Shea
- Language
- eng
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| View Details Download | ATTACHMENT02 | Thesis | 3 MB | Adobe Acrobat PDF | View Details Download |