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Modelling of frictional joints: from dissipative mechanisms to structural response
KTH, School of Engineering Sciences (SCI), Solid Mechanics (Dept.).
2008 (English)Doctoral thesis, comprehensive summary (Other scientific)
Place, publisher, year, edition, pages
Stockholm: KTH , 2008. , 18 p.
Series
Trita-HFL. Report / Royal Institute of Technology, Solid mechanics, ISSN 1654-1472 ; 0470
Keyword [en]
Frictional joint, Bolted joint, Finite element method, Non-linear vibration, Non-local friction, Contact mechanics, Dynamics
National Category
Mechanical Engineering
Identifiers
URN: urn:nbn:se:kth:diva-9625OAI: oai:DiVA.org:kth-9625DiVA: diva2:126757
Public defence
2008-12-05, Sal K2, KTH, Teknikringen 28, Stockholm, 10:15 (English)
Opponent
Supervisors
Note

QC 20100917

Available from: 2008-11-21 Created: 2008-11-21 Last updated: 2013-01-14Bibliographically 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
4. A non-local friction model for efficient finite element modelling
Open this publication in new window or tab >>A non-local friction model for efficient finite element modelling
2008 (English)Report (Other academic)
Series
Royal Institute of Technology, Department of Solid Mechanics, 462
Keyword
non-local friction model, finite element, frictional joints
National Category
Mechanical Engineering
Identifiers
urn:nbn:se:kth:diva-24563 (URN)
Note
QC 20100917Available from: 2010-09-17 Created: 2010-09-17 Last updated: 2010-09-17Bibliographically approved
5. A non-linear model for bolted joints based on deformation modes
Open this publication in new window or tab >>A non-linear model for bolted joints based on deformation modes
2008 (English)Report (Other academic)
Series
Royal Institute of Technology, Department of Solid Mechanics, 463
National Category
Mechanical Engineering
Identifiers
urn:nbn:se:kth:diva-24564 (URN)
Note
QC 20100917Available from: 2010-09-17 Created: 2010-09-17 Last updated: 2010-09-17Bibliographically approved
6. Numerical prediction of damping in structures with frictional joints
Open this publication in new window or tab >>Numerical prediction of damping in structures with frictional joints
2006 (English)In: International Journal of Vehicle Noise and Vibration, ISSN 1479-1471, Vol. 2, no 2, 125-142 p.Article in journal (Refereed) Published
Abstract [en]

In many vehicle and space structures, friction in bolted joints is the primary source of energy dissipation during vibrations. Several simplified finite element models have proven their capacity to describe the energy dissipation owing to micro-slip in joints. However, these simplified models require extensive physical testing in order to extract model parameters. This paper proposes a methodology based on non-linear FE-analysis of the loading on joints for numerical evaluation of the energy dissipation due to micro-slip. The methodology is extended to allow for computation of modal damping in vibrating structures. Presented applications include studies of an isolated joint as well as a more complex structure subjected to dynamic excitation.

Keyword
heavy vehicles, damping prediction, bolted joints, micro-slip modelling, friction, energy dissipation, vehicle vibration, FEA, finite element analysis, modal damping, vibrating structures
National Category
Mechanical Engineering
Identifiers
urn:nbn:se:kth:diva-24565 (URN)10.1504/IJVNV.2006.011050 (DOI)
Note
QC 20100917Available from: 2010-09-17 Created: 2010-09-17 Last updated: 2010-09-17Bibliographically approved

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