Mechanical properties of Gd123 superconducting bulks at 77 K

Fujimoto, Hiroyuki; Murakami, Akira

doi:10.1088/0953-2048/25/5/054017

Cited by 7 publications

(7 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…To enhance the resolution of the NMR signal, it is necessary to achieve a higher trapped field in the REBaCuO ring bulk. During the magnetizing process for superconducting bulks, the mechanical strength of the bulk material must be considered to avoid fracture, because the REBaCuO bulk is a brittle ceramic material and has a low mechanical strength of 30-100 MPa, which is strongly related to the fabrication process [8,9]. The addition of the Ag and the reduction of voids in the bulk during the growth process are also effective to increase in the mechanical strength [10].…”

Section: Introductionmentioning

confidence: 99%

Simulation studies of mechanical stresses in REBaCuO superconducting ring bulks with infinite and finite height reinforced by metal ring during field-cooled magnetization

Fujishiro

Ainslie

Takahashi

et al. 2017

Supercond. Sci. Technol.

View full text Add to dashboard Cite

J J n c c where E c (=10 −4 V m −1 ) is the reference electric field and J c (=4.8 × 10 8 A m −2 ) is the critical current density under zero field, which is a typical J c value at T s = 50 K for the REBaCuO bulk [7]. J c is assumed to be independent of applied magnetic field [7]. For an 'infinite disk bulk' with the same O.D., not the 'infinite ring bulk', the fully magnetized trapped field is estimated to be B z * = μ 0 J c R = 19.30 T (R: radius of the disk bulk) by 2 Supercond. Sci. Technol. 30 (2017) 085008 H Fujishiro et al

show abstract

Section: Introductionmentioning

confidence: 99%

Simulation studies of mechanical stresses in REBaCuO superconducting ring bulks with infinite and finite height reinforced by metal ring during field-cooled magnetization

Fujishiro

Ainslie

Takahashi

et al. 2017

Supercond. Sci. Technol.

View full text Add to dashboard Cite

show abstract

“…The contour map of θ at step 11 is shown in each figure, which details the stress concentration at the inner edge periphery of the TFM cylinder. The maximum θ value reaches +135 MPa at step 11 for Bapp = 10 T, which exceeds the fracture strength of typical Ag-doped REBaCuO bulk materials (50 ~ 70 MPa) [11,12]. In the magnetic lens, a maximum tensile stress of +35 MPa exists at the inner periphery of the magnetic lens and a compressive stress exists in other regions.…”

Section: B Electromagnetic Hoop Stress σθ During Magnetizationmentioning

confidence: 80%

Design Optimization of a Hybrid Trapped Field Magnet Lens (HTFML)

Namba

Fujishiro

Ainslie

et al. 2019

IEEE Trans. Appl. Supercond.

View full text Add to dashboard Cite

The concept of a hybrid trapped field magnet lens (HTFML) was recently proposed by the authors, which consists of a trapped field magnet (TFM) cylinder exploiting the "vortex pinning effect," combined with a superconducting bulk magnetic lens exploiting the "diamagnetic shielding effect." This HTFML can generate, within its bore, a magnetic field higher than the applied magnetic field, even after external field decreases to zero. In this paper, a design optimization of the inner GdBaCuO magnetic lens within the GdBaCuO TFM cylinder was carried out using numerical simulations based on the finite element method, in order to maximize the concentrated magnetic field. The HTFML with an optimized shape and size achieved a concentrated magnetic field of Bc = 5.6 and 12.8 T at the center of the lens for applied magnetic fields of Bapp = 3 and 10 T, respectively. A maximum tensile stress of +135 MPa exists in the outer GdBaCuO TFM cylinder during the magnetizing process for Bapp = 10 T, which exceeds the fracture strength of the bulk. This result suggests that mechanical reinforcement is necessary to avoid mechanical fracture under such high magnetic field conditions.  Index Terms-Hybrid trapped field magnet lens (HTFML), mechanical stress, numerical simulation, REBaCuO bulk superconductor, trapped field magnets

show abstract

“…The rates of diffusion of the sulfur and accelerators are proportional to the concentration gradient of ingredients between the two phases. We can find in the literature studies on the curative diffusion in blends of dissimilar elastomers 31–33…”

Section: Resultsmentioning

confidence: 99%

Use of EPDMSDD as compatibilizer agent for EPDM/EPDMR blends: Rheologic, mechanical, and morphologic properties

Santos

Carmo

Rezende

et al. 2011

J of Applied Polymer Sci

View full text Add to dashboard Cite

Around the world, concern is growing about the amount of waste rubber going into landfills. Policymakers are encouraging researchers to find innovative ways to recycle this waste. In this study, as part of an effort to recycle waste rubber (EPDMR) as filler in compositions of EPDM, we prepare a terpolymer of ethylenepropylene-diene with 1-dodecanethiol (EPDMSDD). We use it as a compatibilizing agent to improve adhesion and incorporation of the residue (EPDMR) in EPDM/EPDMR blends. We synthesize and characterize EPDMSDD through 13 C-NMR and FTIR spectroscopy. We evaluate the effect of the compatibilizer EPDMSDD using vulcanization parameters, such as optimum cure time, scorch time, and torque. To evaluate its effect on the interaction between EPDMSDD/EPDMR, we carried out mechanical tests of samples with and without EPDMSDD. Our findings show that the tensile strength and elongation increased with the addition of EPDMSDD, indicating a better interaction between EPDMR/EPDM. Tear strength also increased with the presence of EPDMSDD, particularly for the amount of 70 and 80 phr of EPDMR. This suggests a good adhesion between the phases in high amounts of waste. The micrographs of the mixtures revealed that the addition of EPDMSDD improved the dispersion of the EPDMR in the EPDM phase.

show abstract

Mechanical properties of Gd123 superconducting bulks at 77 K

Cited by 7 publications

References 15 publications

Simulation studies of mechanical stresses in REBaCuO superconducting ring bulks with infinite and finite height reinforced by metal ring during field-cooled magnetization

Simulation studies of mechanical stresses in REBaCuO superconducting ring bulks with infinite and finite height reinforced by metal ring during field-cooled magnetization

Design Optimization of a Hybrid Trapped Field Magnet Lens (HTFML)

Use of EPDMSDD as compatibilizer agent for EPDM/EPDMR blends: Rheologic, mechanical, and morphologic properties

Contact Info

Product

Resources

About