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Numerical modelling of localised thinning processes for packaging steels. / Michael Fieldhouse
Swansea University Author: Michael Fieldhouse
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With the European Union putting pressure on companies within the packaging chain to recycle, cheap and readily available packaging materials are highly in demand. Steel is the most recycled packaging material and to keep it there research continues in this area. More recently research has switch fro...
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With the European Union putting pressure on companies within the packaging chain to recycle, cheap and readily available packaging materials are highly in demand. Steel is the most recycled packaging material and to keep it there research continues in this area. More recently research has switch from developing and altering tooling to fit certain materials, to developing improved materials for a given manufacturing process, steel can production for example. This has lead to the desire to understand how materials behave under different forming conditions. The solution which would best suit packaging manufacturing companies would be, knowing the material properties, to develop a numerical model which would be able to predict how the material would perform under different forming conditions. This model could be used as an aid to see which new materials should be further developed. To measure these different forming conditions a forming limit diagram is used. A forming limit diagram shows how a material can perform under altering forming conditions, from uniaxial through plane to biaxial strain. Before a model can be produced though, experimental results are needed to validate the model. The current International Standard 12004-2, which is used to produce a forming limit diagram, does not allow materials under a certain thickness. Almost all packaging steel grades are thinner and have proven difficult to obtain reliable results. This thesis outlines the development of a simplified experimental test which is used to measure strain path dependant failure limits of several packaging steels. These results are then used then to generate a computer model in which the different strain conditions can be closely matched to the experiment test method.
Faculty of Science and Engineering