Fatigue guidelines for thin high strength steel joint structures
Fatigue performance of thin HSS joint structures. Based on the experimental results obtained in this project and some assessment we were able to come up with, the following fatigue guidelines for thin HSS sheet joint structures should be followed. - Avoid peel loading. - Prefer adhesive bonding above laser overlap welding when considering a continuous joining method. - Prefer mechanical joining (self-piercing riveting and TOX clinching) above resistance spot welding when considering a noncontinuous joining method. - Optimise geometrical aspects as first priority and choice of HSS sheet material as second. - Neglect mean stress on both self-piercing rivets and laser overlap welds for fatigue ratios of R < 0.5. -Make sure, when self-piercing riveting, to put stronger and/or thicker HSS on top. The above given fatigue guidelines are general and could be applied for most common cases. In a particular case some reserves were made. CAE fatigue analysis tools for laser overlap welds and self-piercing rivets. Investigations into test specimens, including stress analysis by FEM and correlation of the analysis results with the corresponding experimental results have been performed. Software programs for the proposed analysis models have been developed and stress-life relations have been determined. The proposed analysis models have been validated with generated test data, including data with different fatigue ratios and dissimilar sheet thickness and material. Results have shown that the proposed analysis models for laser overlap welds and self-piercing rivets can make life predictions within the scatter band of a factor of 10.
Bibliographic Reference: EUR 22449 EN (2007), 2556 pp. Euro: 35
Availability: Katalogue Number: KI-NA-22449-EN-S The paper version can be ordered online and the PDF version downloaded at: http://bookshop.europa.eu
ISBN: ISBN: 978-92-79-04609-4
Record Number: 200719217 / Last updated on: 2007-07-05
Original language: en
Available languages: en