Stiffness variation in hockey sticks and the impact on stick performance

Carlisle, Graeme Nigel (2012). Stiffness variation in hockey sticks and the impact on stick performance. University of Birmingham. M.Phil.

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Multiple sectioned shafts of carbon fibre composite were modelled using Composite Design Analysis software in order to replicate the range of flexural rigidities shown across the current field hockey stick market. The shafts were then manufactured using hand lay-up and hot-pressing techniques, tested under static and dynamic conditions and the goodness of their relationship with the modelled behaviour was assessed. The shafts were also analysed microscopically for volume fraction, ply-orientation and the interaction between the varied lay-up sections.
The modelling gave a good understanding of the trend of behaviour that was to be expected, but was not accurate enough to predict experimental values. It is possible to create multiple sectioned CFRP shafts that can be controlled for overall flexural rigidity and also strain distribution or “kick-point”. The hand lay-up and hot pressing technique produces consistent volume fraction and accurate fibre orientation, however the seams at which the sections join requires further investigation and development. The relationship between stick stiffness and ball speed validated previous research, stiffer shafts produced a higher CoR in the drop ball test.
There is scope to introduce this stiffness control of the bending behaviour into hockey sticks, by either material properties or section moment of area.

Type of Work: Thesis (Masters by Research > M.Phil.)
Award Type: Masters by Research > M.Phil.
College/Faculty: Colleges (2008 onwards) > College of Engineering & Physical Sciences
School or Department: School of Metallurgy and Materials
Funders: None/not applicable
Subjects: T Technology > TJ Mechanical engineering and machinery
T Technology > TS Manufactures


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