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|Title: ||Pneumatic tyres of fabricless construction|
|Authors: ||Ourbridge, Patrick S.|
|Issue Date: ||1984|
|Publisher: ||© Patrick Stewart Ourbridge|
|Abstract: ||The aim of the research described in this thesis is to assess the technical
feasibility of pneumatic tyres for passenger cars which have no directional
reinforcement in their carcasses. Conventional tyres are constructed from
composites of twisted textile or steel cords in a rubber matrix, a process
which is both labour intensive and costly. If it were possible to injection
mould or cast tyre carcasses in a single operation, and if the performance
of the resulting tyres matched that of modern radial ply tyres, then the
implications for the tyre industry would be of major proportions.
After reviewing the history of pneumatic tyres and summarising their
principal attributes, the design of unreinforced or fabricless tyres is
investigated and methods developed for defining their meridional profiles.
Materials suitable for their carcasses and treads are then considered, prior
to describing the manufacture of two series of tyres designed to have section
height to width ratios, or aspect ratios, of 0.9 and 0.7 respectively.
To facilitate experimental work, two sizes of tyres were employed: half scale
models for which testing procQdures had been developed previously; and a size
suitable for small saloon cars. The results obtained on a range of tyre
properties are presented and analysed to give a number of empirical relationships
between the properties and the design variables: carcass material Young's
modulus, carcass wall thickness and the inflation pressure. For the important
property of radial stiffness which affects other tyre characteristics, an
improved method of analysis is developed to allow the structural and pneumatic
components to be quantified.
Using the relationships established experimentally, consideration is given to
optimising the design of a fabricless tyre. It is concluded that to approach
the performance of a conventional tyre, a design with a low aspect ratio is
preferred but, to restrict growth with inflation'pressure, limited directional
reinforcement must be included as a circumferential-belt beneath the tread.
Nevertheless, the discussion concludes that there are fundamental reasons
why even the optimised tyre would be unacceptable for use on modern passenger
cars, although less demanding applications may be identified.|
|Description: ||Doctoral Thesis. Submitted in partial fulfillment of the requirements for the award of Doctor of Philosophy of Loughborough University.|
|Appears in Collections:||PhD Theses (Materials)|
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