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Fatigue life prediction of self-piercing rivets in automotive applications
2000 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

This work is a study of developing a method how to estimate fatigue life of self-piercing rivets in thin sheet automotive structures. As there can be thousands of rivets in a thin sheet structure it was necessary that the FE-models needed were not too complex. The method used is to represent the structural stresses in the sheets and in the rivets with analytical formulas. The rivets are modeled as beam elements in a coarse global finite element model of the automotive structure. From finite element analysis it is possible to calculate cross sectional moments and forces in the rivets. These moments and forces are used with analytical formulas to calculate the corresponding structural stresses in both rivet and sheets. The models are made in I-DEAS and statically solved in MSC/NASTRAN. The expressions for the analytical calculated stresses are calibrated against stresses found from refined local FE-models of the rivet joint. These models represent the true stress-state in the rivet-joint. They are modeled in I-DEAS and solved with contact analysis in ABAQUS. These stresses can then be used with S-N (stress versus number cycles to failure) curves to determine the fatigue life of the structure. The benefit of this model is that a few beam- and shell-elements can replace thousands of solid elements. Parallel to the analysis work experimental fatigue tests were made. These tests showed that fatigue failure occurred in upper sheet or rivet. Consequently the method is developed considering upper sheet and rivet.

Place, publisher, year, edition, pages
Keyword [en]
Technology, finite element, rivet, steel sheet, fatigue
Keyword [sv]
URN: urn:nbn:se:ltu:diva-41997ISRN: LTU-EX--00/298--SELocal ID: 01330c26-3c70-44e2-9a8c-e6debff9daf5OAI: diva2:1015213
Subject / course
Student thesis, at least 30 credits
Educational program
Mechanical Engineering, master's level
Validerat; 20101217 (root)Available from: 2016-10-04 Created: 2016-10-04Bibliographically approved

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