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1. Costa, Diogo Miguel Silva. Mechanical behaviour of adaptive structures.

Degree: 2017, Repositório Científico do Instituto Politécnico de Lisboa

Master's thesis submitted for the degree of M.Sc. in Mechanical Engineering

Estruturas adaptativas constituídas por materiais compósitos e materiais inteligentes é uma excelente combinação de engenharia, que junta as vantagens tão bem conhecidas dos compósitos, associadas a rácios entre (resistência mecânica e rigidez)/peso e a possibilidade de controlar activamente a resposta mecânica de uma estrutura (ex. através de electrónica, com sensores e actuadores). Estas estruturas versáteis são capazes de reagir e interagir com o seu meio envolvente, continuamente, para cumprirem determinados objectivos. Neste trabalho, o objectivo principal é estudar, modelar e prever o comportamento mecânico de estruturas adaptativas através da programação de algoritmos com Método dos Elementos Finitos e optimização baseada na capacidade de eco-localização dos micro-morcegos. Foi implementada uma plataforma simbólica-numérica-gráfica dedicada à análise de estruturas do tipo viga/placa, assim como a sua optimização meta-heurística, com capacidade de simular estruturas activas multi-camada, constituídas por um número variável de modelos de materiais, desde funcionais gradativos híbridos constituídos por nano-tubos de carbono até misturas gradativas de partículas piezoeléctricas e materiais passivos. Diversos casos de estudo de validação, paramétricos e optimização são desenvolvidos, para diferentes tipos de estruturas e materiais. Os resultados são obtidos, comparados, discutidos e as conclusões extraídas.

Adaptive structures constituted by composites and smart materials are a remarkable engineering combination that join together the already known composites’ advantages, associated with ratios between(mechanical strength and stiffness)/weight and the possibility of actively controlling the mechanicalresponse of a structure (e.g. by means of electronics, with sensors/actuators). These versatile structuresare able to react and interact with their surrounding environments, continuously, to accomplish specificobjectives. In this work, the main objective is to study, model and predict the mechanical behaviour ofadaptive structures by programming the Finite Element Method and optimization algorithms based onmicro-bats’ echolocation capacity. An integrated symbolic-numerical-graphical package devoted tothe analysis of plate/beam-type structures and its meta-heuristic optimization is implemented, with capabilities of simulating active multilayered structures, constituted by a variable number of diferente material models, ranging from hybrid functionally graded materials constituted by carbon nano-tubes to graded mixtures of piezoelectric particles and non-active materials. Several validation, parametric and optimization case studies are computed, for different types of structures and materials. The results obtained are compared, discussed and conclusions are drawn.

N/A

Advisors/Committee Members: Loja, Maria Amélia Ramos.

Subjects/Keywords: Estruturas adaptativas; Optimização inspirada em morcegos; Nano-tubos carbono; Materiais compósitos; Modelação elementos finitos; Materiais funcionais gradativos; Piezoelectricidade; Adaptive structures; Bat-inspired optimization; Carbon nano-tubes; Composite materials; Finite element modelling; Functionally graded materials; Piezoelectricity

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APA (6th Edition):

Costa, D. M. S. (2017). Mechanical behaviour of adaptive structures. (Thesis). Repositório Científico do Instituto Politécnico de Lisboa. Retrieved from https://www.rcaap.pt/detail.jsp?id=oai:repositorio.ipl.pt:10400.21/7052

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Costa, Diogo Miguel Silva. “Mechanical behaviour of adaptive structures.” 2017. Thesis, Repositório Científico do Instituto Politécnico de Lisboa. Accessed June 26, 2019. https://www.rcaap.pt/detail.jsp?id=oai:repositorio.ipl.pt:10400.21/7052.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Costa, Diogo Miguel Silva. “Mechanical behaviour of adaptive structures.” 2017. Web. 26 Jun 2019.

Vancouver:

Costa DMS. Mechanical behaviour of adaptive structures. [Internet] [Thesis]. Repositório Científico do Instituto Politécnico de Lisboa; 2017. [cited 2019 Jun 26]. Available from: https://www.rcaap.pt/detail.jsp?id=oai:repositorio.ipl.pt:10400.21/7052.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Costa DMS. Mechanical behaviour of adaptive structures. [Thesis]. Repositório Científico do Instituto Politécnico de Lisboa; 2017. Available from: https://www.rcaap.pt/detail.jsp?id=oai:repositorio.ipl.pt:10400.21/7052

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

.