Título: | STRESS-CONSTRAINED TOPOLOGY OPTIMIZATION OF HYPERELASTIC STRUCTURES | ||||||||||||
Autor: |
ANDRE XAVIER LEITAO |
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Colaborador(es): |
ANDERSON PEREIRA - Orientador |
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Catalogação: | 10/MAR/2025 | Língua(s): | ENGLISH - UNITED STATES |
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Tipo: | TEXT | Subtipo: | THESIS | ||||||||||
Notas: |
[pt] Todos os dados constantes dos documentos são de inteira responsabilidade de seus autores. Os dados utilizados nas descrições dos documentos estão em conformidade com os sistemas da administração da PUC-Rio. [en] All data contained in the documents are the sole responsibility of the authors. The data used in the descriptions of the documents are in conformity with the systems of the administration of PUC-Rio. |
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Referência(s): |
[pt] https://www.maxwell.vrac.puc-rio.br/projetosEspeciais/ETDs/consultas/conteudo.php?strSecao=resultado&nrSeq=69580&idi=1 [en] https://www.maxwell.vrac.puc-rio.br/projetosEspeciais/ETDs/consultas/conteudo.php?strSecao=resultado&nrSeq=69580&idi=2 |
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DOI: | https://doi.org/10.17771/PUCRio.acad.69580 | ||||||||||||
Resumo: | |||||||||||||
Topology optimization is a powerful engineering design tool that can
lead to innovative layouts and significantly enhance the performance of
engineered systems in various sectors. In a world where we are searching for
cost reduction while being ecologically responsible, we should seek practical
applications of topology optimization. Reducing weight while sustaining
strength requirements is one of them. Another concern is the accurate
prediction of the mechanical behavior of the wide variety of available
materials, such as soft and rubber-like elastomers. To this end, incorporating
nonlinearities will extend conventional topology optimization to hyperelastic
structures and significantly enhance the performance at the primary design
stage. We consider the density-based approach, which enforces us to properly
address numerical instabilities of low-density regions through an energy
interpolation scheme. An augmented Lagrangian-based formulation is used to
deal with the large number of stress evaluation points, whereas polynomial
vanishing constraints are employed to overturn the singularity phenomenon.
We conducted a preliminary investigation under linear-elastic circumstances
to explore different strategies related to stress constraints which justify
implementing the augmented Lagrangian method. In addition, we extract
analytical expressions for sensitivity analysis with extreme rigor and detail.
Problems in plane stress scenarios requires effective computation of the
out-of-plane strain component. Then, in order to do this, we deduced analytical
expressions and a numerical solution based on the Newton s method. Different
examples validate our method, demonstrating the significance of considering
stress constraints and nonlinearities in topology optimization. We additionally
point out that solutions derived from linear theory often violate stress limits
under nonlinear conditions, making them unsuitable for modeling structures
that undergo large deformations.
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