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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
201

Characterisation of an Additively Manufactured Self-Sensing Material Using Carbon Fibre Sensors

Williamson, Alain January 2023 (has links)
Increasing demand for structural health monitoring in space highlights the need to make the creation of these systems more accessible. This study investigates the potential of additive manufacturing to achieve this goal by characterizing a self-sensing material made of a commercially available 3D-printed continuous carbon fibre filament. The results demonstrate the feasibility of converting the filament into a strain sensor with improved sensitivity compared to conventional foil strain gauges. Mechanical and electromechanical properties of the self-sensing material were characterized, including an ultimate tensile strength of 45.09 ± 3.45 MPa, a failure strain of 38.93 ± 3.41%, and a base resistance of 759.11Ω. The tensile gauge factor was calculated to be 467.06 ± 375.90 within the strain range of 0% to 3.8% with a linearity (R2) of 0.93. For the first time, a systematic literature review compares mechanical and electromechanical properties to enable material selection for mechanical design incorporating self-sensing material. The study highlights that the spread of material properties in a group of materials indicates how well-developed a material is for self-sensing purposes. This study advances our understanding of the feasibility of using additive manufacturing to create self-sensing materials for structural health monitoring systems and opens up new avenues for further research.
202

[pt] CADEIAS DE SUPRIMENTOS SUSTENTÁVEIS: SÍNTESE TERCIÁRIA DA LITERATURA E ANÁLISE DE REDES / [en] SUSTAINABLE SUPPLY CHAINS: TERTIARY SYNTHESIS AND NETWORK ANALYSIS

VINICIUS CARVALHO C DE OLIVEIRA 04 February 2021 (has links)
[pt] Este trabalho tem como base a análise sistemática de literatura para geração de conhecimento sobre o tema de cadeias de suprimentos sustentáveis. Para isso, foram utilizados os métodos de revisão sistemática de literatura e análise de redes, para responder as perguntas de pesquisa: quais são as principais taxonomias sobre o tema, quais são os principais direcionamentos de pesquisa futura e como os temas de cadeias de suprimentos sustentáveis se relacionam. Dessa forma, baseando-se em protocolo metodológico rigoroso e utilização do software Vosviwer, foram identificadas as principais taxonomias sobre o tema, os cinco principais assuntos que os autores mais direcionam como pesquisas futuras e as principais relações geradas a partir das análises de coautoria, co-citação, co-ocorrência. Com base nos resultados, foi possível identificar diversos pontos, como o avanço nos trabalhos envolvendo os pilares de forma integrada, as revisões sistemáticas possuindo metodologia mais robusta que revisões narrativas e o aspecto social como o principal tema indicado para pesquisas futuras. Dessa forma, consolidou-se o que se tem de mais novo na literatura sobre o tema de cadeias de suprimentos sustentáveis, orientando a comunidade científica e outras organizações sobre o assunto, mostrando ainda, os possíveis desdobramentos que podem ser trabalhos. / [en] This paper is based on a systematic literature review to create knowledge on the topic of sustainable supply chains. For this, we used the systematic literature review and network analysis methods to answer the research questions: what are the main taxonomies on the topic, what are the main directions for future research and how are the themes of sustainable supply chain themes related? Thus, based on a rigorous methodological protocol and the use of Vosviwer software, the main taxonomies on the topic were identified, the five main trend subjects were collected and the main relationships identified from the co-authoring, co-citation and co-occurrence analysis. Based on the results, it was possible to identify several points, such as the progress in the work involving the pillars in an integrated manner, systematic reviews having a more robust methodology than narrative reviews and the social aspect as the main theme indicated for future research. Thus, the latest in the literature on the topic of sustainable supply chains was consolidated, guiding the scientific community and other organizations on the subject, and also showing the possible developments that may be work.

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