| Campo DC | Valor | Idioma |
|---|
| dc.contributor.advisor | Araújo, José Alexander | - |
| dc.contributor.author | Pinto, André Luis | - |
| dc.date.accessioned | 2023-09-28T16:55:07Z | - |
| dc.date.available | 2023-09-28T16:55:07Z | - |
| dc.date.issued | 2023-09-28 | - |
| dc.date.submitted | 2022-09-21 | - |
| dc.identifier.citation | PINTO, André Luis. Fretting fatigue under variable amplitude loading. 2022. xxvi, 182 f., il. Tese (Doutorado em Ciências Mecânicas) — Universidade de Brasília, Brasília, 2022. | pt_BR |
| dc.identifier.uri | http://repositorio2.unb.br/jspui/handle/10482/46564 | - |
| dc.description | Tese (doutorado) — Universidade de Brasília, Faculdade de Tecnologia, Departamento de Engenharia Mecânica, Programa de Pós-Graduação em Ciências Mecânicas, 2022. | pt_BR |
| dc.description.sponsorship | Agência Nacional de Energia Elétrica (ANEEL). | pt_BR |
| dc.language.iso | eng | pt_BR |
| dc.rights | Acesso Aberto | pt_BR |
| dc.title | Fretting fatigue under variable amplitude loading | pt_BR |
| dc.type | Tese | pt_BR |
| dc.subject.keyword | Fadiga por fretting | pt_BR |
| dc.subject.keyword | Trincas (Engenharia) - propagação | pt_BR |
| dc.subject.keyword | Cargas variáveis | pt_BR |
| dc.contributor.advisorco | Talemi, Reza | - |
| dc.description.abstract1 | Generally, the fretting fatigue problem is treated with constant amplitude
loading. However, this condition is not the reality for industrial applications.
Although there are few studies on fretting fatigue under variable amplitude
loadings, they use a simplistic approach to life estimation (unable to capture the
effects of the complex multiaxial and non-proportional stress field that exists
under the contact interface) and only the bulk fatigue load has its amplitude
alternating. The objective of this work is to propose a numerical methodology
for the life assessment of components subjected to fretting fatigue under variable
amplitude loading and to study the effects of these loads. For this, experimental
tests were carried out by applying H-L (High-Low) and L-H (Low-High) loading
blocks to the tangential load, that is, the contact normal load and the amplitude
of the bulk fatigue load were kept constant while the tangential load has its
alternating amplitude. The numerical methodology proposed for fretting fatigue
life assessment includes the wear effect and crack propagation. The multiaxial
fatigue parameter SWT, the theory of critical distance TCD, and Miners’ linear
rule were used to compute the damage in the crack nucleation phase. The
node-displacement algorithm based on Archard’s law was applied to account
wear. In the crack propagation phase, the CDM (critical direction method)
was used to estimate the crack initiation angle considering the worn contact
surface, and then the crack is modeled and propagated. The still limited
range of experimental data done in this work for fretting fatigue under varying
loading blocks seems to indicate that the loading sequence has an effect on the
accumulated fatigue damage, mainly to the H-L loading sequences. Based on
this observation, a new non-linear damage model was proposed. Using this new
damage model, the life estimation results were within a scatter band of 1.2. | pt_BR |
| dc.contributor.email | andreluis.eng.mecanica@gmail.com | pt_BR |
| dc.description.unidade | Faculdade de Tecnologia (FT) | pt_BR |
| dc.description.unidade | Departamento de Engenharia Mecânica (FT ENM) | pt_BR |
| dc.description.ppg | Programa de Pós-Graduação em Ciências Mecânicas | pt_BR |
| Aparece nas coleções: | Teses, dissertações e produtos pós-doutorado
|
