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Mechanical models for electrical cables
KTH, School of Engineering Sciences (SCI), Mechanics.
2005 (English)Licentiate thesis, comprehensive summary (Other scientific)
Abstract [en]

A theoretical and experimental study of mechanical properties of electrical cables with multi order helical structure has been performed. Relations between applied deformations and local strains in the first order helical structure have been developed. The model is then generalized with a hierarchical approach where the strains at any order helical structure are expressed as functions of strains in the upper order helix under the assumption that all components are sticking to each other.

The force balance between the strains and the friction forces is considered. When the cable is exposed to small bending curvature, the slippage of the component is prevented by the frictional force. At this stage, the components of the cable behave as solid beams. Slippage occurs between the components when the tensile force in the components overcomes the frictional force. This state occurs at sufficiently large bending curvatures and results in a variable bending stiffness varying with the magnitude of the applied bending curvature.

The response of the cable to pure bending is measured and the data is evaluated using the theoretical model described above. Magnitudes of un- known properties of the cable are estimated by comparing the theoretical and experimental data. To utilize the model in terms of life time estimation, a number of parameters were suggested to relate the mechanical properties of the cable to wear and fatigue. A parametric study has been done to investigate how these parameters are affected by changing cable properties or the loading condition.

Place, publisher, year, edition, pages
Stockholm: KTH , 2005. , v, 17 p.
Keyword [en]
Electrical cable, Industrial robot, Multi order helical struc- ture, mechanical model, fatigue
National Category
Fluid Mechanics and Acoustics
Identifiers
URN: urn:nbn:se:kth:diva-486OAI: oai:DiVA.org:kth-486DiVA: diva2:14194
Presentation
2005-11-18, Seminarierum 5/156, Teknikringen 78A, Stockholm, 13:00
Opponent
Supervisors
Note
QC 20101203Available from: 2005-11-10 Created: 2005-11-10 Last updated: 2010-12-03Bibliographically approved
List of papers
1. Strains in multi level helical structures
Open this publication in new window or tab >>Strains in multi level helical structures
(English)In: International Journal of Solids and Structures, ISSN 0020-7683, E-ISSN 1879-2146Article in journal (Other academic) Submitted
National Category
Fluid Mechanics and Acoustics
Identifiers
urn:nbn:se:kth:diva-8773 (URN)
Note
QS 20120327Available from: 2005-11-10 Created: 2005-11-10 Last updated: 2012-03-27Bibliographically approved
2. Mechanical response of electrical cables to imposed motion
Open this publication in new window or tab >>Mechanical response of electrical cables to imposed motion
(English)In: Engineering structures, ISSN 0141-0296, E-ISSN 1873-7323Article in journal (Other academic) Submitted
National Category
Fluid Mechanics and Acoustics
Identifiers
urn:nbn:se:kth:diva-8774 (URN)
Note
QS 20120327Available from: 2005-11-10 Created: 2005-11-10 Last updated: 2012-03-27Bibliographically approved
3. Mechanical analysis of second order helical structure in electrical cable
Open this publication in new window or tab >>Mechanical analysis of second order helical structure in electrical cable
2007 (English)In: International Journal of Solids and Structures, ISSN 0020-7683, E-ISSN 1879-2146, Vol. 44, no 5, 1657-1679 p.Article in journal (Refereed) Published
Abstract [en]

A new model for calculating the response of electrical cables to bending has been developed accounting for multi-order helical structure and frictional effects. Stresses occurring in wires and the number of slipping wires were suggested as key properties in terms of expectation of cable life time. The model was applied to chosen cables and the magnitudes of the mentioned key properties were calculated. Parametric study was also done to investigate how these values are affected by changing the properties of the cable. It has been shown that increasing the pressure from jacket or insulation material causes larger stress while it prevents the slippage of wires. Applying a tensile force to the cable produces the same result, whereas using larger lay angles for both conductors and wires decreases internal stress and prevents the slippage.

Keyword
order helical structure, hierarchical model, cables
National Category
Fluid Mechanics and Acoustics
Identifiers
urn:nbn:se:kth:diva-8775 (URN)10.1016/j.ijsolstr.2006.06.045 (DOI)000244270200020 ()2-s2.0-33846105101 (Scopus ID)
Note
Uppdaterad från accepted till published(20101203). QC 20101203Available from: 2005-11-10 Created: 2005-11-10 Last updated: 2010-12-03Bibliographically approved

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Citation style
  • apa
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