Investigation of Local Damage Effect on Nb3Sn Superconductor Properties

Abdyukhanov, I. M.; Tsapleva, A. S.; Mareev, K. A.; Alekseev, M. V.; Lukyanov, Pavel; Polikarpova, M.; Zakharova, G. A.; Panashchuk, I. A.; Nasibulin, M.; Dergunova, E. A.

doi:10.1007/s10512-020-00698-0

Cited by 1 publication

(2 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The mechanical properties of Nb 3 Sn materials are similar to those of ceramics; therefore, brittle fracture occurs when they are subjected to tiny deformations. As such, many experts have started to concentrate on investigating Nb 3 Sn filament fracture [41][42][43][44][45][46][47][48]. Curtin and Zhou [41,42] hypothesized that filament breakage is a random process related to axial stress, and the filament fracture length could be described using the Weibull distribution function.…”

Section: Introductionmentioning

confidence: 99%

“…Yong et al [45] established a twodimensional crack bridge model to investigate the fracture behavior of filaments within the strand and calculated the stress intensity factors of modes I, II, and III crack tips, as well as the relative opening displacements between the crack surfaces. Abdyukhanov et al [46] investigated the influence of artificially generated surface defects on the microstructure and the electrical parameters of two kinds of Nb 3 Sn superconductors in 2021. Through SEM observations, it was found that the current-carrying capacity of the superconductor decreased proportionally with the increases in defect size and number.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Elastic–Plastic Mechanical Behavior Analysis of a Nb3Sn Superconducting Strand with Initial Thermal Damage

Zhang

Shi

2022

Applied Sciences

View full text Add to dashboard Cite

It is well known that the parameters of Nb3Sn superconducting strands are strain sensitive, and the internal brittle Nb3Sn filament can easily break under deformations. A temperature difference from the preparation temperature of about 1000 K to the cryogenic working environment of 4.2 K damages brittle Nb3Sn fibers before working. Based on the Curtin–Zhou model, the damage theory for fiber-reinforced composites is utilized to study the influence of filament fractures caused by thermal stress. According to the typical multi-scale geometric of the EAS-Nb3Sn strand (European Advanced Superconductor, EAS), an efficient hierarchical homogenized calculation model considering filament fracture and matrix plasticity was established. In this work, we took the filament fracture caused by both thermal stresses and mechanical loads into consideration using the secant modulus and simultaneously had the impact of the plastic constitutive of the bronze matrix and the copper protective layer. Mechanical parameters, such as the homogenized secant modulus, shear modulus, and Poisson’s ratio in different directions of level scale, were predicted at various temperatures. The elastoplastic mechanical behavior of the strands subjected to axial load was analyzed, and the results were in good agreement with the experiment. The initial thermal fiber fracture has non-negligible effects on the mechanical properties of the EAS-Nb3Sn superconducting strand and play the role in accelerating the increase in fiber breakage.

show abstract