Scapecchi, Chiara
(2024)
Analysis and prediction of fretting fatigue life., [Dissertation thesis], Alma Mater Studiorum Università di Bologna.
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Automotive per una mobilità intelligente, 36 Ciclo.
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Abstract
Fretting fatigue is a fatigue damage process that occurs when two surfaces in contact with each other are subjected to relative micro-slip, causing a reduced fatigue life with respect to the plain fatigue case. Fretting has been now studied deeply for over 50 years, but still no univocal design approach has been universally accepted. This thesis presents a method for predicting the fretting fatigue life of materials based on the material specific fatigue parameters. To validate the method, a set of fretting fatigue experimental tests have been run, using a newly designed specimen. FE analyses of the tests were also run and the SWT parameter was retrieved and it was found
to be useful to successfully identify which samples failed. Finally, S-N curves were retrieved by using two different fatigue life predicting methods (CoffinManson and Jahed-Varvani). The two different methods were compared with
the experimental results and it was found that the Jahed-Varvani method gave accurate results in terms of fretting fatigue life.
Abstract
Fretting fatigue is a fatigue damage process that occurs when two surfaces in contact with each other are subjected to relative micro-slip, causing a reduced fatigue life with respect to the plain fatigue case. Fretting has been now studied deeply for over 50 years, but still no univocal design approach has been universally accepted. This thesis presents a method for predicting the fretting fatigue life of materials based on the material specific fatigue parameters. To validate the method, a set of fretting fatigue experimental tests have been run, using a newly designed specimen. FE analyses of the tests were also run and the SWT parameter was retrieved and it was found
to be useful to successfully identify which samples failed. Finally, S-N curves were retrieved by using two different fatigue life predicting methods (CoffinManson and Jahed-Varvani). The two different methods were compared with
the experimental results and it was found that the Jahed-Varvani method gave accurate results in terms of fretting fatigue life.
Tipologia del documento
Tesi di dottorato
Autore
Scapecchi, Chiara
Supervisore
Co-supervisore
Dottorato di ricerca
Ciclo
36
Coordinatore
Settore disciplinare
Settore concorsuale
Parole chiave
fretting fatigue, fatigue testing, Al7075-T6, Jahed-Varvani, SWT
URN:NBN
Data di discussione
21 Marzo 2024
URI
Altri metadati
Tipologia del documento
Tesi di dottorato
Autore
Scapecchi, Chiara
Supervisore
Co-supervisore
Dottorato di ricerca
Ciclo
36
Coordinatore
Settore disciplinare
Settore concorsuale
Parole chiave
fretting fatigue, fatigue testing, Al7075-T6, Jahed-Varvani, SWT
URN:NBN
Data di discussione
21 Marzo 2024
URI
Gestione del documento:
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