The objective of the project is to contribute to the promotion of HSS (high strength steel)materials to be applied in lightweight design of future cars. To achieve this overall objective the aim is: (1) To demonstrate the advantages of HSS materials with respect to the fatigue performance when novel joining techniques are applied rather than the conventional spot welding technique. (2) To create a database of fatigue properties for various types of joint structures. The structures will be joined by novel joining methods as laser welding, self-piercing rivets, clinching and adhesive bonding. (3) To develop software modules that allow the automotive design engineer to take full advantage of the HSS materials. These software modules have to be able to predict the fatigue performance of the novel joining techniques when used to access a full structure analysis with commonly used FEM (Finite Element Method) analysis codes. Based on the experimental results, fatigue guidelines are given that could be applied for most common cases. Two CAE (computer-aided engineering) fatigue analysis tools for laser overlap welds and self piercing rivets have been developed that can make life predictions within the scatter band of a factor of 10. They will allow the automotive engineer to asses the fatigue performance in the early stages of automotive vehicle development.
Fatigue guidelines for thin high strength steel joint structures
Richtlinien für die Ermüdung von dünnen gefügten Konstruktionen aus hochfestem Stahl
2007
256 Seiten, 256 Bilder, 58 Tabellen, 36 Quellen
Report
English
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