Stress–Strain Relationship, Critical Strain (Stress) and Irreversible Strain (Stress) of IBAD-MOCVD-Based 2G HTS Wires Under Uniaxial Tension

Zhang, Y.; Hazelton, D.W.; Kelley, Rodney E; Kasahara, Masato; Nakasaki, R.; Sakamoto, H.; Polyanskii, Anatolii

doi:10.1109/tasc.2016.2515988

Cited by 67 publications

(66 citation statements)

References 15 publications

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“…Critical strain (ε c , 95) and irreversible strain (ε irr , 0.99) were unaffected by copper thickness, with intrinsic values of 0.45 and 0.75%. The calculated results are consistent with the measured stress-strain curves, which can be well adapted using the Ramberg-Osgood equation and substrate [71]. Janecska et al show that enraptured pressure imaging can distinguish lithography surrenders in the 70 nm FinFET gadget's development cycle stream.…”

Section: Variation Of Metal Characteristics Under Differentsupporting

confidence: 69%

Evaluation of Prestrain Annealing Impact on Nanomaterial Sensitization

Suresh¹,

DeepaT.

Natrayan

et al. 2021

Journal of Nanomaterials

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Light metal alloys are extensively used in automotive, aerospace, aircraft, and military sectors since their lightweight leads to reduced energy consumption, increased fuel efficiency, and better environmental protection. In the present situation, nanomaterials are the potential candidate for weight saving in the structural application and can meet stringent government norms. Nanomaterial was heat-treated in the furnace to about a certain temperature and time and then normalized for strengthening. The heat-treated nanomaterial undergoes different forging processes, namely, hot forging and cold forging, using a certain capacity’s hydraulic press. Hence, in this work, an extensive study on the influence of the prestrain annealing, the corrosion rate on differently treated samples, and the effect of sensitization heat treatment on the nanomaterial was done.

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Section: Variation Of Metal Characteristics Under Differentsupporting

confidence: 69%

Evaluation of Prestrain Annealing Impact on Nanomaterial Sensitization

Suresh¹,

DeepaT.

Natrayan

et al. 2021

Journal of Nanomaterials

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“…Above this limit there is a risk of reduction in the critical superconducting current capacity as well as delamination of the internal layers within the HTS tape (Zhang et al. 2016). Regardless, the optimization framework can take arbitrary strain limits as input, and results are generally given in terms of peak predicted .…”

Section: Winding Angle Optimization Methodsmentioning

confidence: 99%

Non-planar coil winding angle optimization for compatibility with non-insulated high-temperature superconducting magnets

Paz-Soldan

2020

J. Plasma Phys.

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The rapidly emerging technology of high-temperature superconductors (HTS) opens new opportunities for the development of non-planar non-insulated HTS magnets. This type of HTS magnet offers attractive features via its simplicity and robustness, and is well suited for modest size steady-state applications such as a mid-scale stellarator. In non-planar coil applications the HTS tape may be subject to severe hard-way bending strain ( $\epsilon _{\textrm {bend}}$ ), torsional strains ( $\epsilon _{\textrm {tor}}$ ) and magnetic field components transverse to the HTS tape plane ( $B_{\perp }$ ), all of which can limit the magnet operating space. A novel method of winding angle optimization is here presented to overcome these limitations for fixed input non-planar coil filamentary geometry. Essentially, this method: (i) calculates the peak $\epsilon _{\textrm {bend}}$ and $B_{\perp }$ for arbitrary winding angle along an input coil filamentary trajectory, (ii) defines a cost function including both and then (iii) uses tensioned splines to define a winding angle that reduces $\epsilon _{\textrm {tor}}$ and optimizes the $\epsilon _{\textrm {bend}}$ and $B_{\perp }$ cost function. As strain limits are present even without $B_{\perp }$ , this optimization is able to provide an assessment of the minimum buildable size of an arbitrary non-planar non-insulating HTS coil. This optimization finds that for standard 4 mm wide HTS tapes the minimum size coils of the existing HSX, NCSX and W7-X stellarator geometries are around 0.3–0.5 m in mean coil radius. Identifying the minimum size provides a path to specify a mid-scale stellarator capable of achieving high-field or high-temperature operation with minimal HTS tape length. For coils larger than this size, strain optimization allows use of wider (higher current capacity) HTS tapes or alternatively permitting a finite (yet tolerable) strain allows reduction of $B_{\perp }$ . Reduced $B_{\perp }$ enables a reduction of the HTS tape length required to achieve a given design magnetic field or equivalently an increase in the achievable magnetic field for fixed HTS tape length. The distinct considerations for optimizing a stellarator coilset to further ease compatibility with non-insulated HTS magnets are also discussed, highlighting relaxed curvature limits and the introduction of limits to the allowable torsion.

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“…In the LNI coil, the maximum stress in the copper sheet is 255 MPa, and the maximum stress in the polyimide sheet is 14 MPa. However, the yield stresses of copper and polyimide can be 340 and 69 MPa, respectively [53,54]. The simulation results show that the LNI winding approach cannot enhance the risk of mechanical damage of the coil under this operating condition.…”

Section: Stress Induced By the Cooling Process And Lorentz Forcementioning

confidence: 99%

“…The equivalent elastic modulus, Poisson's ratio, and thermal expansion coefficient can be estimated by the homogenization method[52]. Detailed mechanical parameters for different conductor materials are shown in Tables 2[53][54][55][56][57][58][59][60][61][62] and 3 . Note that the mechanical equations are also solved by commercial FEM software COMSOL.…”

mentioning

confidence: 99%

Ramping loss and mechanical response in a no-insulation high-temperature superconducting layer-wound coil and intra-layers no-insulation coil

Liu

Yong

2021

Sci. China Technol. Sci.

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The layer-wound coil has a great potential in nuclear magnetic resonance and magnetic resonance imaging owing to the better spatial homogeneity of the magnetic field. However, high-temperature superconducting (HTS) coil wound by no-insulation (NI) layer-wound technique has been verified with a long field delay time. A new method named the intra-layer no-insulation (LNI) winding technique has been proposed to reduce the charging delay time of the coil. This paper is mainly to study and compare the ramping loss and mechanical characteristics of the layer-wound coil and LNI coil. The results indicate that the total ramping loss can be significantly reduced by using the LNI winding method. The effects of the ramping rate of power supply current and the contact resistivity on the ramping loss are also discussed in the paper. Furthermore, the stress distributions in the layer-wound coil and LNI coil are compared, where the cooling process and Lorentz force are both considered. It can be found that the copper sheet of the LNI coil experiences relatively higher stress than its (RE)Ba 2 Cu 3 O x (REBCO) conductor layer. Meanwhile, the magnitude of stress generated in the REBCO conductor of the LNI coil is slightly different from that of the layer-wound coil.

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Stress–Strain Relationship, Critical Strain (Stress) and Irreversible Strain (Stress) of IBAD-MOCVD-Based 2G HTS Wires Under Uniaxial Tension

Cited by 67 publications

References 15 publications

Evaluation of Prestrain Annealing Impact on Nanomaterial Sensitization

Evaluation of Prestrain Annealing Impact on Nanomaterial Sensitization

Non-planar coil winding angle optimization for compatibility with non-insulated high-temperature superconducting magnets

Ramping loss and mechanical response in a no-insulation high-temperature superconducting layer-wound coil and intra-layers no-insulation coil

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