Título: | THERMOMECHANICAL ANALYSIS OF DAMAGE IN QUASE-BRITTLE MATERIALS | ||||||||||||
Autor: |
ILAMES JORDAN GAMA DE MORAES |
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Colaborador(es): |
DEANE DE MESQUITA ROEHL - Orientador ELEAZAR CRISTIAN MEJIA SANCHEZ - Coorientador |
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Catalogação: | 19/ABR/2022 | Língua(s): | PORTUGUESE - BRAZIL |
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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=58658&idi=1 [en] https://www.maxwell.vrac.puc-rio.br/projetosEspeciais/ETDs/consultas/conteudo.php?strSecao=resultado&nrSeq=58658&idi=2 |
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DOI: | https://doi.org/10.17771/PUCRio.acad.58658 | ||||||||||||
Resumo: | |||||||||||||
Predicting the behavior of almost brittle materials in face of material degradation up
to fracture is a topic that can be addressed with the use of continuous damage
mechanics. Thermal effects, in addition to mechanical ones, may contribute
significantly to the structural and material response. In this sense, the coupling
between the different branches of physics takes into account the free conversion of
energy in its various forms. The present work is about the thermal-mechanical
coupling in in quasi-brittle materials, in which the isotropic damage model and the
damage criteria are addressed, as well as the laws of evolution of thermal and
mechanical damage. In addition, aspects inherent to thermodynamics and heat
transfer are explained. The thermal effect in the structural analysis begins with an
investigation of the requirements for temperature variations to produce thermal
stresses and follows with a study of the effect of temperature on the material, which
affects the elasticity module, the tensile and compression strength, in addition to the
fracture energy. However, finite element modeling of stiffness degradation due to the
damage process leads to problems of dependence on the mesh, which requires the use
of regularization techniques, as addressed in this work. Numerical examples
demonstrate the effects of thermo-mechanical coupling in the assessment of structure
integrity.
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