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Life cycle assessment of grit blasting and femtosecond laser patterning: a comparison of surface preparation techniques
University West, Department of Engineering Science, Division of Subtractive and Additive Manufacturing.
2020 (English)Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
Abstract [en]

The purpose of the study is to assess the life cycle impacts of conventional grit-blasting and FSL patterning as an alternative surface preparation. FSL has notable advantages in that it does not leave any contaminationon surface, whereas grit blasting does. By employment of Life Cycle Analysis (LCA) method, a powerful methodology for evaluating the environmental impacts of the process used in the production of a product could be utilised. The LCA methodology largely relies on data about inputs, outputs and environmental impacts of a process. It has four iterative phases, namely clear definition of goal and scope, inventory analysis, impact assessment and interpretation. The goal was set as the evaluation of the environmental impact between conventional grit-blasting and femtosecond laser patterning. The scope restricted the system boundary to 'cradle to gate' without the consideration of machinery. Data was gathered from multiple sources under limitations imposed by COVID-19 and other factors. The impact assessment employed the LCA Impact 2002+ Endpoint methodology to process data inputs to determine the comparative impacts of both systems on climate change, ecosystem quality, resources, and human health. The interpretation of the LCA Impact 2002+ method applied to a Canadian scenario showed that the femtosecond laser was significantly less damaging on all metrics except for human health. Human health was disadvantaged for the femtosecond laser solely because of ionising radiation, which could potentially be mitigated through radiation safety protocols. A sensitivity analysis using the Impact 2002+ model was run for India. The results were very different and showed less damage to all four categories for grit blasting. This is driven by the higher electricity consumption (57 times more) of the femtosecond laser process combined with the difference in the source of power generation in India, where the generation of electricity causes more damage due to its greater reliance on non-renewable fossil fuels. Further exploration can be done to enhance the data inputs into this model as per the limitations and assumptions already stated.

Place, publisher, year, edition, pages
2020. , p. 2020
Keywords [en]
life cycle analysis, surfaces
National Category
Mechanical Engineering
Identifiers
URN: urn:nbn:se:hv:diva-15899Local ID: EXM502OAI: oai:DiVA.org:hv-15899DiVA, id: diva2:1470978
Subject / course
Mechanical engineering
Educational program
Maskiningenj├Âr
Supervisors
Examiners
Available from: 2020-10-19 Created: 2020-09-27 Last updated: 2020-10-19Bibliographically approved

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CiteExportLink to record
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Citation style
  • apa
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