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FE modeling of bolted joints in structures
Linköping University, Department of Management and Engineering, Solid Mechanics. Linköping University, The Institute of Technology.
2012 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

This paper presents the development of a finite element method for modeling fastener joints in aircraft structures. By using connector element in commercial software Abaqus, the finite element method can handle multi-bolt joints and secondary bending. The plates in the joints are modeled with shell elements or solid elements.

First, a pre-study with linear elastic analyses is performed. The study is focused on the influence of using different connector element stiffness predicted by semi-empirical flexibility equations from the aircraft industry. The influence of using a surface coupling tool is also investigated, and proved to work well for solid models and not so well for shell models, according to a comparison with a benchmark model.

Second, also in the pre-study, an elasto-plastic analysis and a damage analysis are performed. The elasto-plastic analysis is compared to experiment, but the damage analysis is not compared to any experiment. The damage analysis is only performed to gain more knowledge of the method of modeling finite element damage behavior.

Finally, the best working FE method developed in the pre-study is used in an analysis of an I-beam with multi-bolt structure and compared to experiments to prove the abilities with the method. One global and one local model of the I-beam structure are used in the analysis, and with the advantage that force-displacement characteristic are taken from the experiment of the local model and assigned as a constitutive behavior to connector elements in the analysis of the global model.

Place, publisher, year, edition, pages
2012. , 56 p.
Keyword [en]
Bolted joints, Fastener joints, Load distribution, Flexibility, Connector element
National Category
Applied Mechanics
URN: urn:nbn:se:liu:diva-81110ISRN: LIU-IEI-TEK-A—12/014446-SEOAI: diva2:550529
External cooperation
Saab Aeronautics
Subject / course
Solid Mechanics
2012-08-23, A37, Linköping University, 581 83 Linköping, Sweden, 11:28 (Swedish)
Available from: 2012-09-10 Created: 2012-09-07 Last updated: 2012-09-10Bibliographically approved

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