| People | Locations | Statistics |
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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Ansell, Martin
University of Bath
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (13/13 displayed)
- 2020Physico-chemical Characterization and Development of Hemp Aggregates for Highly Insulating Construction Building Materialscitations
- 2019Comparative moisture and heat sorption properties of fibre and shiv derived from hemp and flaxcitations
- 2019Development of novel building composites based on hemp and multi-functional silica matrixcitations
- 2018Cell wall microstructure, pore size distribution and absolute density of hemp shivcitations
- 2018Comparative moisture and heat sorption properties of fibre and shiv derived from hemp and flaxcitations
- 2017Physical characterisation of hemp shiv: Cell wall structure and porosity
- 2017Physical characterisation of hemp shiv
- 2016Influence of eco-materials on Indoor Air Qualitycitations
- 2016The effects of sol-gel silicates on hydration kinetics and microstructure of Portland cement systems
- 2015Sol-Gel Technology as a Seeding Agent for Portland Cement Systems
- 2011Adiabatic shear band formation as a result of cryogenic CNC machining of elastomerscitations
- 2010The formation of adiabatic shear bands as a result of cryogenic CNC machining of elastomerscitations
- 2010Development of non-metallic timber connections for contemporary applications
Places of action
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article
Adiabatic shear band formation as a result of cryogenic CNC machining of elastomers
Abstract
The traditional method for producing polymer-based products is the use of moulding technologies such as injection moulding. CNC machining methods are predominantly used for metal part manufacture. The use of CNC machining methods for direct machining of polymers has been discussed in previous studies, particularly for hard polymers such as polypropylene. The CNC machining of soft elastomers, such as ethylene vinyl acetate (EVA), even at significantly reduced temperatures presents a number of challenges, with one being the formation of a machining phenomenon termed adiabatic shear bands, which can lead to increased part surface roughness and reduced part quality. The adiabatic shear band is an area on a chip where the ductile properties of the material being machined have been exceeded and the heat generated does not have sufficient time to be removed. This can lead to permanent material damage resulting in reduced fatigue resistance. The adiabatic shear formation has the potential to be even more evident with the machining of elastomers, leading to rapid material degradation, poor surface finish characteristics, and reduced material attenuation. In this paper the state of the art in cryogenic manufacturing is described and the concept of cryogenic CNC machining of elastomers is discussed. The experimental work consists of machining EVA and Neoprene utilizing the described cryogenic CNC machining facility. Sample chips are taken from the experimental testing and analysed using a scanning electron microscope to illustrate the adiabatic shear band formation in some cases. It is observed that in order to reduce this effect, correct machining parameters corresponding to the elasticity values need to be used and the glass transition temperature needs to be maintained.