Ultrasonic velocity in epoxy resin at temperatures down to 4.2 K

Perepechko, I. I.; Данилов, В. А.; Nizhegorodov, V. V.

doi:10.1007/bf02254743

Cited by 5 publications

(2 citation statements)

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“…Knowledge of the ultrasonic speed and related acoustical parameters provides information about molecular interactions, the nature and strength of these interactions [6][7][8][9][10][11][12][13][14][15][16][17], and is very useful in polymer solution processing technology. In a solution, a coiled up polymer molecule unfolds and expands because of repulsion between similar charged groups in the chain.…”

Section: Introductionmentioning

confidence: 99%

Ultrasonic Speed and Thermodynamic Parameters of Novel Epoxy Resin Solutions Based on Cardo Symmetric Double Schiff Bases at 308.15 K

2012

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The density, viscosity and ultrasonic speed (2 MHz) of several pure solvents: chloroform, THF, and 1,4-dioxane, along with epoxy resin solutions, have been investigated in order to understand the effect of solvents on molecular interactions in these systems at 308.15 K. Various thermodynamic parameters such as the ultrasonic speed (U ), adiabatic compressibility (κ α ), Van der Waals constant (b), internal pressure (π), intermolecular free path length (L f ), and viscous relaxation time (τ ) have been determined and correlated with the concentration (C). Good-to-excellent correlations are observed between a given parameter and the concentration. Linear or nonlinear increases or decreases of thermodynamic parameters with concentration indicated the existence of strong molecular interactions in the solutions. Gibb's energy of activation was found to be dependent on the concentration, nature of the solutes, and the solvents used.

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Section: Introductionmentioning

confidence: 99%

Ultrasonic Speed and Thermodynamic Parameters of Novel Epoxy Resin Solutions Based on Cardo Symmetric Double Schiff Bases at 308.15 K

2012

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“…A detailed mesoscale model-with the imperfections or voids-was created to simulate the cable (figure 1(f)). The resin was assumed to be linear and elastic; its Young's modulus is 4.2 GPa at 293 K and 8.6 GPa at 4.2 K [70]; its Poisson's ratio is 0.38 at 293 K and 0.34 at 4.2 K [71]. Although there are only three materials (annealed copper, resin, and homogenized filamentary region) in the detailed mesoscale model of the cable, the model is highly complex due to the existence of the voids, and the complicated geometry of the resin and woven strands.…”

Section: Mesoscale Model Of Resin-impregnated Cable and Second Homoge...mentioning

confidence: 99%

Multi-scale nonlinear stress analysis of Nb₃Sn superconducting accelerator magnets

Sun¹

2022

Supercond. Sci. Technol.

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A multi-scale nonlinear procedure to analyze the stress in Nb3Sn superconducting accelerator magnets is presented to address one of the most challenging obstacles currently facing the successful development of high-field superconducting magnets—the issue of stress management. The study demonstrates that gaskets (special nonlinear materials) are capable of modeling the complex nonlinear deformation behavior of insulation layers within the Nb3Sn coil block and that Hill materials (orthotropic materials utilizing the Hill yield criterion) are suitable to enable homogenization of the filamentary regions and the resin-impregnated Nb3Sn Rutherford cables. With the whole magnet under preload, cool-down, and Lorentz forces, the nonlinear behavior of the Nb3Sn coil was simulated, in three orthongonal axes, by the combined properties of the gaskets (insulation layers) and Hill materials (resin-impreganted cable). The procedure entailes minimal material assumptions because it incorporated measured stress-strain curves in the analysis. The coil was simulated to a high level of detail consisting of the insulation layers and resin-impregnated cables. The computed compressive azimuthal stresses of the cables were used to assess the stress-induced performance degradation. Through submodeling, the area-weighted average axial strains of the strands were computed and employed to evaluate the strain-induced performance degradation. The overall performance degradation of the Nb3Sn coil was thus obtained, and this information was subsequently used to guide the design of the overall magnet. Besides Nb3Sn magnets, this procedure can also be employed in the design of LTS, HTS, and room temperature magnets or in any composite structures.

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Efficient multiscale investigation of mechanical behavior in Nb3Sn superconducting accelerator magnet based on self-consistent clustering analysis

Feng,

Yong,

Zhou

2023

Composite Structures

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Ultrasonic velocity in epoxy resin at temperatures down to 4.2 K

Cited by 5 publications

References 0 publications

Ultrasonic Speed and Thermodynamic Parameters of Novel Epoxy Resin Solutions Based on Cardo Symmetric Double Schiff Bases at 308.15 K

Ultrasonic Speed and Thermodynamic Parameters of Novel Epoxy Resin Solutions Based on Cardo Symmetric Double Schiff Bases at 308.15 K

Multi-scale nonlinear stress analysis of Nb₃Sn superconducting accelerator magnets

Efficient multiscale investigation of mechanical behavior in Nb3Sn superconducting accelerator magnet based on self-consistent clustering analysis

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Ultrasonic velocity in epoxy resin at temperatures down to 4.2 K

Cited by 5 publications

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Ultrasonic Speed and Thermodynamic Parameters of Novel Epoxy Resin Solutions Based on Cardo Symmetric Double Schiff Bases at 308.15 K

Ultrasonic Speed and Thermodynamic Parameters of Novel Epoxy Resin Solutions Based on Cardo Symmetric Double Schiff Bases at 308.15 K

Multi-scale nonlinear stress analysis of Nb3Sn superconducting accelerator magnets

Efficient multiscale investigation of mechanical behavior in Nb3Sn superconducting accelerator magnet based on self-consistent clustering analysis

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Product

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Multi-scale nonlinear stress analysis of Nb₃Sn superconducting accelerator magnets