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Models and mechanisms of dissipation in bolted joints
KTH, School of Engineering Sciences (SCI), Solid Mechanics (Dept.), Solid Mechanics (Div.).
2007 (English)Licentiate thesis, comprehensive summary (Other scientific)
Place, publisher, year, edition, pages
Stockholm: KTH , 2007. , 4 p.
Series
Trita-HFL. Report / Royal Institute of Technology, Solid Mechanics, ISSN 1654-1472 ; 0432
National Category
Mechanical Engineering
Identifiers
URN: urn:nbn:se:kth:diva-4326OAI: oai:DiVA.org:kth-4326DiVA: diva2:11819
Presentation
2007-03-30, Sal H1, KTH, Teknikringen 33, Stockholm, 10:15
Opponent
Supervisors
Note

QC 20101119

Available from: 2007-04-11 Created: 2007-04-11 Last updated: 2013-01-15Bibliographically approved
List of papers
1. Influence from contact pressure distribution on energy dissipation in bolted joints
Open this publication in new window or tab >>Influence from contact pressure distribution on energy dissipation in bolted joints
2006 (English)In: Welding & Joining & Fastening & Friction Stir Welding, SAE International , 2006Chapter in book (Other academic)
Abstract [en]

Energy dissipation due to micro-slip in joints is the primary source of damping in many vehicle and space structures. This paper presents results on how the surface topology may be modified to increase the energy dissipation in joints. An analytical solution for general forms of contact pressure of a one-dimensional micro-slip problem is presented. The solution indicates how the contact pressure should be distributed to maximize the energy dissipation. Two dimensional contact pressures are optimized using finite element methods in combination with numerical optimization methods and the results are used to modify the surface topology in bolted joints in order to increase the energy dissipation during loading. The predicted increase of energy dissipation is validated with physical testing. A direct result of the study is a washer with varying thickness increasing the energy dissipation in joints and hence the structural damping of joined structures.

Place, publisher, year, edition, pages
SAE International, 2006
National Category
Mechanical Engineering
Identifiers
urn:nbn:se:kth:diva-6958 (URN)10.4271/2006-01-0778 (DOI)2-s2.0-84877422035 (Scopus ID)978-0-7680-1769-4 (ISBN)
Note
QC 20100917Available from: 2007-04-11 Created: 2007-04-11 Last updated: 2010-09-17Bibliographically approved
2. Metallic inserts as a tool to alter the structural damping of joined structures
Open this publication in new window or tab >>Metallic inserts as a tool to alter the structural damping of joined structures
2008 (English)In: International Journal of Surface Science and Engineering, ISSN 1749-785X, Vol. 2, no 1-2, 152-167 p.Article in journal (Refereed) Published
Abstract [en]

The dynamic response of joined structures, notably the amplification of vibrations, is strongly influenced by the characteristics of the joints. Bolted joints are non-linear both in stiffness and magnitude of energy dissipation, and structures assembled with bolted joints inherit these non-linearities. This largely experimental study shows how thin metallic inserts in the contact region may serve as a tool to alter the non-linear properties of the joint and in this way increase or decrease the level of equivalent viscous damping in the structure. Both quasi-static and dynamic measurements have been performed and a mathematical model trimmed to the static measurements has been shown to produce valid results also for dynamic simulations.

Keyword
structural damping, joints, metallic inserts, joint models, friction, dissipation
National Category
Mechanical Engineering
Identifiers
urn:nbn:se:kth:diva-6959 (URN)10.1504/IJSURFSE.2008.018974 (DOI)000207632200011 ()2-s2.0-54449093856 (Scopus ID)
Note
QC 20100917Available from: 2007-04-11 Created: 2007-04-11 Last updated: 2010-09-17Bibliographically approved
3. Mechanisms of dissipation in frictional joints: influence of sharp contact edges and plastic deformaiton
Open this publication in new window or tab >>Mechanisms of dissipation in frictional joints: influence of sharp contact edges and plastic deformaiton
2008 (English)In: Wear, ISSN 0043-1648, E-ISSN 1873-2577, Vol. 265, no 11-12, 1814-1819 p.Article in journal (Refereed) Published
Abstract [en]

In the present study frictional and plastic dissipation in joints are investigated by means of the finite element method. The Coulomb friction model is used in simulations and the results are compared to experimental measurements. Some of the contacts considered contain numerous internal sharp edges that are localized inside the overall contact region. For joints with sharp contact edges an elastic material model with Coulomb friction is inappropriate because of the sliding-over-edge that occurs in such joints. Here, the sliding-over-edge phenomenon is studied with an elastic-plastic material model in some detail. The phenomenon involves very high plastic strains locally, material build-up in front of the edge and large plastic dissipation. A summation technique for the total dissipation in joints is presented, where each local sliding-over-edge contribution is taken into account. The results are compared to experiments. It is shown that plastic deformation is an important contributing factor to the total dissipation in joints with highly non-conformal surfaces.

Keyword
Frictional joints, Elasto-plastic contact, Sliding-over-edge, Finite element
National Category
Mechanical Engineering
Identifiers
urn:nbn:se:kth:diva-6960 (URN)10.1016/j.wear.2008.04.026 (DOI)000261283300031 ()2-s2.0-54149115082 (Scopus ID)
Note
QC 20100917. Uppdaterad fraån manuskript till artikel (20100917).Available from: 2007-04-11 Created: 2007-04-11 Last updated: 2017-12-14Bibliographically approved

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Citation style
  • apa
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