Geoffrey Turvey

Bio: Geoffrey Turvey is an academic researcher from Lancaster University. The author has contributed to research in topics: Deflection (engineering) & Flange. The author has an hindex of 21, co-authored 122 publications receiving 1537 citations.

Physical test data for the appraisal of design procedures for bolted joints in pultruded FRP structural shapes and systems

Abstract: A review is presented of the tests undertaken to characterize bolted joints (no adhesive bonding) for pultruded fibre-reinforced plastic (PFRP) structural shapes and systems. The review is written with regard to the appraisal of existing connection design procedures for plate-to-plate bolted joints. It is shown that 15 uncoordinated series of tests on single-bolt and multi-bolt double lap joints provide 800 ultimate strength results. Each of the series of tests had different objectives and so different joint variables were studied. This reflects the current state of guidance on joint design and installation in pultruders' design manuals and elsewhere, which is shown to be limited and inconsistent. By rationalizing the number of variables the authors have tested a further 900 joints in order to generate a larger database of strengths and modes of failure, which may be used to appraise connection design procedures, such as the Hart-Smith and EUROCOMP Design Code and Handbook simplified and rigorous methods. Observations are made on the findings from 16 series of tests with respect to the current state of design of PFRP plate-to-plate bolted joints.

Carpet recycling: A review of recycled carpets for structural composites

Abstract: Carpets are multilayer mixtures of different polymers and inorganic fillers that are difficult and costly to reprocess upon disposal. About 400 000 tonnes of carpets are sent to landfill in the UK annually, however, the landfill option is becoming increasingly impractical due to increasing landfill costs and the physical limitations on the number of landfill sites available in the UK. In addition, carpets are non-biodegradable and reduce the availability of landfill for other uses. Hence, this leads to a major drive to increase carpet recycling, which could potentially have a significant positive impact on the environment. This paper gives an overview of the composition of carpets, and the different classifications of carpet waste. In addition, the paper discusses the different end of use options for carpets in the UK. The paper also reviews the different manufacturing processes that utilise carpet waste as raw material in the fabrication of structural composites. The tensile and flexural properties of these composites are presented and discussed. These mechanical properties appear to support the use of carpet waste as potential composite materials for structural load-bearing applications.

Stress analysis and strength prediction of mechanically fastened joints in FRP: A review

Abstract: A review of the investigations that have been made on the stress and strength analysis of mechanically fastened joints in fibre-reinforced plastics (FRP) is presented. The experimental observations of the effects of joint geometry, ply-orientation, lay-up and through-thickness pressure on the joint behaviour are described briefly for both single and multi-fastener joints. The analytical and numerical methods of stress analysis required before trying to predict failure are discussed. The numerical approaches cover both two and three-dimensional models and the effects of clearance, friction and geometry are assessed. The several methods that have been used to predict failure in single or multi-fastener joints are described. It is concluded that there are some issues that require further investigation. There is no general agreement about the method that should be used to predict failure, but progressive damage models are quite promising since important aspects of the joint's behaviour can be modelled using this approach. In order to take into consideration several factors related to joint strength the use of three-dimensional models is suggested. These models require a three-dimensional failure criterion and an appropriate property degradation law.

Second-order generalised beam theory for arbitrary orthotropic materials

Abstract: This paper presents the formulation of a Generalised Beam Theory (GBT) developed to analyse the structural behaviour of composite thin-walled members made of laminated plates and displaying arbitrary orthotropy. The main concepts and procedures involved in the available isotropic first-order GBT are revisited and adapted/modified to account for the specific aspects related to the member orthotropy. In particular, the orthotropic GBT fundamental equilibrium equations and corresponding boundary conditions are derived and their terms are physically interpreted, i.e., associated with the member mechanical properties. Moreover, different laminated plate material behaviours are dealt with and their influence on the GBT equations is investigated. Finally, in order to clarify the concepts involved in the formulated GBT and illustrate its application and capabilities, a thin-walled orthotropic beam is analysed and the results obtained are thoroughly discussed.