Título: | ADVANCES IN IMPLICIT INTEGRATION ALGORITHMS FOR MULTISURFACE PLASTICITY | ||||||||||||
Autor: |
RAFAEL OTAVIO ALVES ABREU |
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Colaborador(es): |
DEANE DE MESQUITA ROEHL - Orientador ELEAZAR CRISTIAN MEJIA SANCHEZ - Coorientador |
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Catalogação: | 04/DEZ/2023 | 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=65316&idi=1 [en] https://www.maxwell.vrac.puc-rio.br/projetosEspeciais/ETDs/consultas/conteudo.php?strSecao=resultado&nrSeq=65316&idi=2 |
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DOI: | https://doi.org/10.17771/PUCRio.acad.65316 | ||||||||||||
Resumo: | |||||||||||||
The mathematical representation of complex material behavior requires a
sophisticated constitutive formulation, as it is the case of multisurface plasticity.
Hence, a complex elastoplastic model demands a robust integration procedure for
the plastic evolution equations. Developing integration schemes for plasticity
models is an important research topic because these schemes are directly related to
the accuracy and efficiency of numerical simulations for materials such as metals,
concrete, soils and rocks. The performance of the finite element solution is directly
influenced by the convergence characteristics of the state-update procedure.
Therefore, this work explores the implementation of complex constitutive models,
focusing on generic multisurface plasticity models. This study formulates and
evaluates state-update algorithms that form a robust framework for simulating
materials governed by multisurface plasticity. Implicit integration algorithms are
developed with an emphasis on achieving robustness, comprehensiveness and
flexibility to handle cumbersome plasticity applications effectively. The state-update algorithms, based on the backward Euler method and the Newton-Raphson
and Newton-Krylov methods, are formulated using line search strategies to improve
their convergence characteristics. Additionally, a substepping scheme is
implemented to provide further robustness to the state-update procedure. The
flexibility of the algorithms is explored, considering various stress conditions such
as plane stress and plane strain states, within a single, versatile integration scheme.
In this scenario, the robustness and performance of the algorithms are assessed
through classical finite element applications. Furthermore, the developed
multisurface plasticity background is applied to formulate a coupled elastoplastic-damage model, which is evaluated using experimental tests in concrete structures.
The achieved results highlight the effectiveness of the proposed state-update
algorithms in integrating multisurface plasticity equations and their ability to handle
challenging finite element problems.
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