Título: | FATIGUE CRACK PROPAGATION IN ARBITRARY 2D GEOMETRIES UNDER COMPLEX LOADING. | ||||||||||||||||||||||||||||||||||||||||||||
Autor: |
ANTONIO CARLOS DE OLIVEIRA MIRANDA |
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Colaborador(es): |
LUIZ FERNANDO CAMPOS RAMOS MARTHA - Orientador |
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Catalogação: | 13/MAI/2003 | 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=3496&idi=1 [en] https://www.maxwell.vrac.puc-rio.br/projetosEspeciais/ETDs/consultas/conteudo.php?strSecao=resultado&nrSeq=3496&idi=2 |
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DOI: | https://doi.org/10.17771/PUCRio.acad.3496 | ||||||||||||||||||||||||||||||||||||||||||||
Resumo: | |||||||||||||||||||||||||||||||||||||||||||||
A reliable and cost effective two-phase methodology is
proposed to predict fatigue crack propagation in generic
two-dimensional structural components under complex
loading. First, the fatigue crack path and its stress
intensity factor are calculated in a specialized finite-
element software, using small crack increments. Numerical
methods are used to calculate the crack propagation path,
based on the computation of the crack incremental
direction, and the stress-intensity factors KI, from the
finite element response. Then, an analytical expression is
adjusted to the calculated KI(a) values, where a is the
length along the crack path. This KI(a) expression is used
as an input to a powerful general purpose fatigue design
software based on the local approach, developed to predict
both initiation and propagation fatigue lives under complex
loading by all classical design methods, including the SN,
the eN and the IIW (for welded structures) to deal with
crack initiation, and the da/dN to treat propagation
problems. In particular, its crack propagation module
accepts any KI expression and any da/dN rule, using the
DKrms or the cycle-by-cycle propagation methods to deal
with one and twodimensional crack propagation under complex
loading. If requested, this latter method may include
overload-induced crack retardation effects. This two-phase
methodology is experimentally validated by fatigue tests on
compact tension and bending single edge notch specimens,
modified with holes positioned to attract or to deflect the
cracks.
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