Compression and Shear Tests of Vacuum-Impregnated Composites at Cryogenic Temperatures

Simon, N.J.; Reed, R. P.; Walsh, R. P.

doi:10.1007/978-1-4757-9050-4_46

Cited by 22 publications

(8 citation statements)

References 2 publications

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“…Details of other methods and their pros and cons, such as the shear-compression test, which was widely used in the US, 55,68,69 or the "doublelap shear test" (DLS), 70 which is particularly useful for assessing fatigue effects of the shear strength, can be found in the literature. 59,71,72 The focus on the mechanical rather than the electrical properties of these materials dates back to very early work showing that the dielectric breakdown remained rather unaffected under radiation compared to the mechanical performance.…”

Section: Methodsmentioning

confidence: 99%

Radiation Effects on Superconducting Fusion Magnet Components

Weber

2011

Int. J. Mod. Phys. E

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Nuclear fusion devices based on the magnetic confinement principle heavily rely on the existence and performance of superconducting magnets and have always significantly contributed to advancing superconductor and magnet technology to their limits. In view of the presently ongoing construction of the tokamak device ITER and the stellerator device Wendelstein 7X and their record breaking parameters concerning size, complexity of design, stored energy, amperage, mechanical and magnetic forces, critical current densities and stability requirements, it is deemed timely to review another critical parameter that is practically unique to these devices, namely the radiation response of all magnet components to the lifetime fluence of fast neutrons and gamma rays produced by the fusion reactions of deuterium and tritium. I will review these radiation effects in turn for the currently employed standard "technical" low temperature superconductors NbTi and Nb 3 Sn, the stabilizing material (Cu) as well as the magnet insulation materials and conclude by discussing the potential of high temperature superconducting materials for future generations of fusion devices, such as DEMO.

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Section: Methodsmentioning

confidence: 99%

Radiation Effects on Superconducting Fusion Magnet Components

Weber

2011

Int. J. Mod. Phys. E

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“…To avoid both the slippage problem and the load uncertainty problem, a test fixture shown in Fig. 2(b) was designed by Simon et al [22]. It consists of two identical right-angle trapezoidal blocks, respectively, at the top and the bottom of the fixture and one isosceles trapezoidal block at the center, and a rectangular slot is cut at the center of each tilt surface to hold the specimen.…”

Section: Methodsmentioning

confidence: 99%

Controlled normal/shear loading and shear fracture in bulk metallic glasses

et al. 2009

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“…The UTS tests were carried out according to the ASTM D3039, and the ILSS tests were determined by short-beam bending test according to the ASTM D2344. For the compressive shear (45 ) strength test, this is non-standard test, first proposed by Simon [6], and the test specimens were prepared by VPI process. The resin formula is the same as that of the SCC test sample using an adapted mold.…”

Section: F Mechanical Strength Testmentioning

confidence: 99%

Development of Insulation Technology With Vacuum-Pressure-Impregnation (VPI) for ITER Correction Coil

et al. 2012

IEEE Trans. Appl. Supercond.

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ITER Magnet System includes 18 Correction Coils (CC), made with NbTi cable-in-conduit 10 kA conductor, wound into multiple pancakes. The turn and ground insulation were electrically insulated with a glass tape/polyimide interleaved multilayer composite, which should be impregnated with epoxy resin. Some technical issues remaining have to be addressed in the manufacturing process of these coils. One of the issues is the impregnation and curing of the insulation system, which should achieve good mechanical properties and sufficient high voltage insulation (5 kV). The authors performed manufacturing trials of the insulation system using the vacuum pressure impregnation (VPI) method, which is an effective process to remove defects such as dry spots and over rich resins in the insulation system. In order to simulate and optimize the feasible VPI process, two VPI test samples with the length of 1000 mm have been fabricated. In this paper, we introduce the detailed VPI process including the insulation materials and insulation structures for CC and present the results of the related mechanical and electrical tests performed. The mechanical properties, including tensile strength, inter-laminar shear as well as compressive shear (45 ) were evaluated at room temperature and liquid nitrogen temperature (77 K). In addition, the dielectric strength of the turn insulation and the ground insulation on the test samples were also examined. The results of the tests were discussed versus the design requirements.Index Terms-Insulation, ITER, mechanical and electrical properties, vacuum pressure impregnation.

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Compression and Shear Tests of Vacuum-Impregnated Composites at Cryogenic Temperatures

Cited by 22 publications

References 2 publications

Radiation Effects on Superconducting Fusion Magnet Components

Radiation Effects on Superconducting Fusion Magnet Components

Controlled normal/shear loading and shear fracture in bulk metallic glasses

Development of Insulation Technology With Vacuum-Pressure-Impregnation (VPI) for ITER Correction Coil

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