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Fatigue strength assessment of different materials under variable amplitude loadings with the Findley damage parameter

Fatigue life evaluation of components in engineering structures is crucial for ensuring their long-term reliability and safety. As operational loads can be arbitrary, including multiaxiality  and  variable  amplitudes,  fatigue  life  assessment  approaches  able  to evaluate these are needed. This study presents a modification to the Findley damage parameter  for  assessing  fatigue  life under  multiaxial  variable  amplitude  loading, including  both  proportional  and  nonproportional  loading  conditions.  The  Findley damage  parameter  is  adapted  to  explicitly  account  for mean  stresses  at  different loading ratios.
The proposed modification integrates the mean stress sensitivity of the materials into the damage parameter.…

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Fatigue life evaluation of components in engineering structures is crucial for ensuring their long-term reliability and safety. As operational loads can be arbitrary, including multiaxiality  and  variable  amplitudes,  fatigue  life  assessment  approaches  able  to evaluate these are needed. This study presents a modification to the Findley damage parameter  for  assessing  fatigue  life under  multiaxial  variable  amplitude  loading, including  both  proportional  and  nonproportional  loading  conditions.  The  Findley damage  parameter  is  adapted  to  explicitly  account  for mean  stresses  at  different loading ratios.
The proposed modification integrates the mean stress sensitivity of the materials into the damage parameter. Additionally, the nonproportionality of the loads is taken into account by the nonproportionality factor as proposed by Gaier. A set of fatigue data from  component  testing  under  variable  amplitude  loading  is  utilised  to  validate  the modified parameter’s accuracy. The parameter is used with the critical plane approach and the results are compared to the experimental database. Additionally, the performance of the fatigue assessment procedure for different material groups from the FKM-guideline is evaluated.

Artikelnummer
ICMFF14-2025-01

Titel
Fatigue strength assessment of different materials under variable amplitude loadings with the Findley damage parameter
Autor(en)
C. Fällgren, M. Vormwald
DOI
10.48447/ICMFF14-2025-01
Veranstaltung
14. International Conference on Multiaxial Fatigue and Fracture 2025
Jahr der Veröffentlichung
2025
Publikationsart
Tagungsmanuskript (PDF)
Sprache
Englisch
Stichwörter
Multiaxial fatigue,Findley parameter,critical plane method,variable amplitude loading,FKM-guideline