Fatigue Life Prediction in Aluminium Welds for Thin-sheet Structures
Typ
Examensarbete för masterexamen
Program
Applied mechanics (MPAME), MSc
Publicerad
2022
Författare
Kristiansson, Robin
Norberg, Filip
Modellbyggare
Tidskriftstitel
ISSN
Volymtitel
Utgivare
Sammanfattning
Current codes and recommendations used for fatigue analysis of welded joints are
mainly developed for the civil and maritime sectors where the material thickness used
is typically more than 5 mm. This is a problem when studying welded components in
the automotive industry where the general structure is thinner. This thesis aims to
propose and compare two methods with different level of modelling detail developed
for thin-walled structures with a material thickness of less than 5 mm. The methods
proposed are found from a study of relevant research and are implemented on two
different joints. A series of different load cases were simulated and a comparison of
the results was made with the aim of finding any discrepancies between the methods,
both concerning fatigue resistance data and stress extraction. The findings suggests
that the major deviation between the methods is related to the fatigue resistance
data which is determined from different experimental sources. More interesting
was the difference between the methods related to the stress extraction where the
deviation in the results depends on the ratio between membrane and bending stresses
in the welded joints.
Beskrivning
Ämne/nyckelord
welds , fatigue , thin-walled structures , aluminium , FEA , Volvo method , notch stress method