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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

A conjugate modal force strategy for instability analysis of thin-walled structures: an unconstrained vector positional finite element approach

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Autor(es):
Soares, Henrique Barbosa [1] ; Paccola, Rodrigo Ribeiro [1] ; Coda, Humberto Breves [1]
Número total de Autores: 3
Afiliação do(s) autor(es):
[1] Univ Sao Paulo, Escola Engn Sao Carlos, Ave Trabalhador Sao Carlense 400, Sao Carlos, SP - Brazil
Número total de Afiliações: 1
Tipo de documento: Artigo Científico
Fonte: LATIN AMERICAN JOURNAL OF SOLIDS AND STRUCTURES; v. 18, n. 2 2021.
Citações Web of Science: 0
Resumo

Abstract The importance of knowing critical loads and post-critical behavior of thin-walled structures motivates the development of several scientific and practical studies. Most references are concerned with stability analysis for small displacements (first order approach), or with second order stability analyzes, a less precise geometric nonlinear strategy. However, very flexible structures or ones that present small loss of stiffness after the first critical load need more careful analysis. Here we present a shell numerical formulation capable of carrying out stability analysis of thin-walled structures developing large displacements. This formulation uses generalized unconstrained vectors as nodal parameters instead of rotations. To make possible a complete stability analysis using unconstrained vectors, we present an original strategy that imposes a Conjugate Modal Force at the vicinity of critical points, allowing an accurate choice of post-critical paths. Non-conservative forces are also considered and results are compared with literature benchmarks, demonstrating the accuracy and capacity of the proposed formulation. (AU)

Processo FAPESP: 20/05393-4 - Ferramentas numéricas para análise de estruturas considerando materiais avançados
Beneficiário:Humberto Breves Coda
Modalidade de apoio: Auxílio à Pesquisa - Regular
Processo FAPESP: 18/19288-8 - Desenvolvimento de ferramenta computacional para análise de colapso estrutural pelo método dos elementos finitos posicional
Beneficiário:Henrique Barbosa Soares
Modalidade de apoio: Bolsas no Brasil - Doutorado