| 1. |
- Inagaki, Kenta, et al.
(författare)
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Mechanical analysis of second order helical structure in electrical cable
- 2007
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Ingår i: International Journal of Solids and Structures. - : Elsevier BV. - 0020-7683 .- 1879-2146. ; 44:5, s. 1657-1679
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Tidskriftsartikel (refereegranskat)abstract
- 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.
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| 2. |
- Inagaki, Kenta
(författare)
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Mechanical models for electrical cables
- 2005
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Licentiatavhandling (övrigt vetenskapligt/konstnärligt)abstract
- 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.
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| 3. |
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| 4. |
- Inagaki, Kenta, et al.
(författare)
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Strains in multi level helical structures
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Ingår i: International Journal of Solids and Structures. - 0020-7683 .- 1879-2146.
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)
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| 5. |
- Inagaki, Shunsuke, et al.
(författare)
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Effects of adsorbed molecular ordering to the superconductivity of a two-dimensional atomic layer crystal
- 2023
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Ingår i: Physical Review Materials. - : American Physical Society. - 2475-9953. ; 7:2
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Tidskriftsartikel (refereegranskat)abstract
- The effect of 3,4,9,10-perylenetetracarboxylic dianhydride (PTCDA) adsorption on the physical properties of the two-dimensional (2D) atomic layer superconductor (ALSC) In/Si(111)-(7×3) has been studied by angle-resolved photoelectron spectroscopy, transport measurements, and scanning tunneling microscopy. Hole doping from the adsorbed molecules has been reported to increase the superconducting transition temperature Tc of this ALSC, and the molecular spin tends to decrease it. Owing to its large electron affinity and its nonexistent spin state, the adsorption of PTCDA was expected to increase Tc. However, the PTCDA adsorption dopes only a small number of holes in the In layers and causes a suppression of Tc with a sharp increase in the normal-state sheet resistance followed by an insulating transition. Taking the disordering of the arrangement of PTCDA into account, we conclude that the increase in resistance is due to the localization effect originating from the random potential that is induced by the disordered PTCDA molecules. The present result also indicates the importance of the crystallinity of a 2D molecular film adsorbed on ALSCs.
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