Mechanical behaviors of multi-filament twist superconducting strand under tensile and cyclic loading

Wang, Xu; Li, Yingxu; Gao, Yuanwen

doi:10.1016/j.cryogenics.2015.11.002

Cited by 22 publications

(10 citation statements)

References 52 publications

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“…The FE method is an effective tool for studying the mechanical behavior of multifilamentary Nb 3 Sn strands [21,[62][63][64][65][66]. This method facilitates both the analysis of the strain state of the Nb 3 Sn superconductors in the operating environment and the analysis of the degradation of the superconducting critical properties [67,68].…”

Section: Multi-scale Fe Modelsmentioning

confidence: 99%

Numerical simulation of mechanical behaviors and intergranular fracture of polycrystalline Nb₃Sn and superconducting filaments

Ding

Marzi

Gao

2023

Supercond. Sci. Technol.

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Given the importance of large-scale engineering applications of the superconducting compound Nb3Sn, both its use and performance under certain operating conditions have attracted the interest of applied superconductivity researchers and material scientists for several years now. Huge efforts are directed toward understanding the response to applied loads and predicting fracture damage within their internal microstructure; this is fundamental in the design of superconducting coils and magnets which must meet stringent requirements in terms of maximum thermal and electromagnetic loads. In this paper, the fracture behaviors in polycrystalline Nb3Sn and Nb3Sn filaments with composite structures are investigated using the micromechanical finite element (FE) models with Voronoi tessellation. First, the 2D and 3D Voronoi FE models of the polycrystalline Nb3Sn tensile tests are developed and validated to provide insight into the cracking behavior in the intergranular brittle fracture of polycrystalline Nb3Sn. A cohesive zone model is used to simulate crack propagation at the grain level model including grain boundary zones. It is found that the pre-existing cracks of polycrystals and martensitic phase transformation of grains significantly impact the fracture properties in polycrystalline Nb3Sn. Second, detailed FE models of powder-in-tube (PIT) and bronze route (BR) filaments with Voronoi structures for fracture analysis are then developed on the basis of experimental observations of sectional morphologies. The mechanism of crack initiation and propagation under tensile load have been investigated by analyzing the mechanical properties of each component and the characteristics of multi-scale composite structures of filaments. Furthermore, the damage situation is investigated in PIT filaments undergoing transverse compressive load. The proposed simulation method in this paper can be extended to the fracture and damage analysis of Nb3Sn superconducting wires with different layouts and fabrication processes.

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Section: Multi-scale Fe Modelsmentioning

confidence: 99%

Numerical simulation of mechanical behaviors and intergranular fracture of polycrystalline Nb₃Sn and superconducting filaments

Ding

Marzi

Gao

2023

Supercond. Sci. Technol.

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“…Mitchell [24] 建立了Nb 3 Sn股线分析的三维有限元模型, 考虑了股线在弯曲与热应力共同作用下的超导芯丝轴向变形. Wang等人 [25] 和Jing等人 [26] 分别建立了更为精细的FEM模型与等效夹杂模型, 考虑了芯丝断裂、节距、界面脱黏、初始残余应变、材料非线性本构等多种因素的影响, 分析发现芯丝螺距对股线内部应变以及股线应力应变曲线均会产生重要影响, 数值模拟结果与实验结果吻合较好. 意大利帕多瓦大学Boso等人 [27,28] [29] 拓展了这一模型, 将结构的非线性与材料弹塑性本构引入Boso模型, 弥补了Boso模型无法描述非线性应力应变曲线关系的缺陷 [30,31] .…”

Section: 个中心螺线管模块(Central Solenoid Cs)、18个环向场unclassified

Research progress on the mechanical behavior of the cable in conduit conductor for the international thermonuclear experimental reactor project

2017

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“…However, this kind of model is not well-adapted to describe cyclic behavior and more particularly the Bauschinger effect. To be able to predict the cyclic response of the strand, it is necessary to introduce kinematic hardening variables [14], [23].…”

Section: Elasto-plastic Modelingmentioning

confidence: 99%

“…based strands using various approaches [10]- [14]. Cyclic behavior with Bauschinger effect is rarely taking into account in these models, except by [14]. In this paper, we propose a method to model the mechanical behavior of superconducting strands thorough macroscopic, mesoscopic and microscopic approaches.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Characterization and Modeling of a Powder-In-Tube MgB₂ Strand

Lenoir

Aubin

2017

IEEE Trans. Appl. Supercond.

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The strain dependence of superconducting material is known to be responsible for the degradation of the electrical performance of cables. As such, their electrical optimization requires an understanding of their mechanical behavior. The present paper introduces a method for elasto-plastic modeling of commercial MgB2 multi-filamentary strands manufactured by the ex-situ powder-in-tube method. The model is based on a simplified representation of the structure, built using components' volume fractions and nano-indentation test data. Monotonic and cyclic tension-compression tests were performed on the strands before and after chemical dissolution of the Monel outer layer to provide a multi-scale experimental database. These tests were used to identify the parameters of the kinematic and isotropic hardening laws of the elasto-plastic model. The model intends to be subsequently used to simulate the electrical behavior of cables and define guidelines for the manufacturing process, cabling process and end-product operating condition.

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Mechanical behaviors of multi-filament twist superconducting strand under tensile and cyclic loading

Cited by 22 publications

References 52 publications

Numerical simulation of mechanical behaviors and intergranular fracture of polycrystalline Nb₃Sn and superconducting filaments

Numerical simulation of mechanical behaviors and intergranular fracture of polycrystalline Nb₃Sn and superconducting filaments

Research progress on the mechanical behavior of the cable in conduit conductor for the international thermonuclear experimental reactor project

Mechanical Characterization and Modeling of a Powder-In-Tube MgB₂ Strand

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Mechanical behaviors of multi-filament twist superconducting strand under tensile and cyclic loading

Cited by 22 publications

References 52 publications

Numerical simulation of mechanical behaviors and intergranular fracture of polycrystalline Nb3Sn and superconducting filaments

Numerical simulation of mechanical behaviors and intergranular fracture of polycrystalline Nb3Sn and superconducting filaments

Research progress on the mechanical behavior of the cable in conduit conductor for the international thermonuclear experimental reactor project

Mechanical Characterization and Modeling of a Powder-In-Tube MgB2 Strand

Contact Info

Product

Resources

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Numerical simulation of mechanical behaviors and intergranular fracture of polycrystalline Nb₃Sn and superconducting filaments

Numerical simulation of mechanical behaviors and intergranular fracture of polycrystalline Nb₃Sn and superconducting filaments

Mechanical Characterization and Modeling of a Powder-In-Tube MgB₂ Strand