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Simulation of Bolted Joint with Frictional Contacts
Luleå University of Technology, Department of Engineering Sciences and Mathematics.
2019 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

An easy and reliable way to join two or more components is to use a bolted joint. When

torque is applied on the bolt head, a clamp force is achieved. However about 90% of this

torque will be used just to overcome the friction in the interfaces. To be able to fasten

these in an ecient and precise manner the friction in the bolt threads and underhead

area is important to understand. This is currently investigated at Atlas Copco by using a

friction test rig, FTR, which measures the clamp force, the total torque and the shank

torque.

To evaluate the test rig and also to be able to evaluate dierent friction models, a

parameterised simulation model of a bolted joint is built. This is a 3D-model of the joint

containing a bolt, a nut and a test specimen. The stiness and frictional behaviour of the

FTR is used in the model to get a good comparison between these two. Dierent contact

formulations and settings are tested to achieve a good model. Also, mesh size, step size

and material models are evaluated to see the eect of these.

The results show a good correlation between the FTR data and the simulation model.

For the total torque to clamp force ratio a dierence of about 1% is achieved. The average

dierence in shank torque and underhead torque is at 3.1% and -1.6% respectively.

The pressure distribution for this model is shown to be unevenly distributed along the

threads. This is minimized by softening the contact, but this instead increases the error

between the FTR data and the simulation model. For the evaluation of friction models

that are based on the contact pressure this needs to be investigated further to nd a good

compromise between the contact pressure and the frictional behaviour.

Place, publisher, year, edition, pages
2019. , p. 55
Keywords [en]
Bolted joint, friction, simulation model, contact
National Category
Mechanical Engineering
Identifiers
URN: urn:nbn:se:ltu:diva-74490OAI: oai:DiVA.org:ltu-74490DiVA, id: diva2:1324267
External cooperation
Atlas Copco
Subject / course
Student thesis, at least 30 credits
Educational program
Mechanical Engineering, master's level
Supervisors
Examiners
Available from: 2019-06-13 Created: 2019-06-13 Last updated: 2019-06-13Bibliographically approved

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CiteExportLink to record
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Citation style
  • apa
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  • de-DE
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Output format
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