Mechanical characterization of glass fibre–epoxy composite material for ITER pre-compression rings

Crescenzi, F.; Marini, Fabrizio; Nardi, C.; Pizzuto, A.; Rossi, Paolo; Verdini, L.; Rajainmäki, H.; Knaster, J.; Bettinali, L.

doi:10.1016/j.fusengdes.2011.04.048

Cited by 18 publications

(6 citation statements)

References 3 publications

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“…Impact of operational conditions (4K at high vacuum for periods >1 year) in the Rings mechanical performance. The analytical work began by modeling the Pre-compression ring system during preloading, cool-down analysis and stress analysis initially based on the material properties from the R&D results [5]. The next phase is to use the material properties (including fracture energies) obtained from the coupons manufactured using prepreg tape and the AFP process.…”

Section: Finite Element Analysismentioning

confidence: 99%

“…A R&D program, based on filament wound and dry wound S2 glass unidirectional fibers, the latter processed by vacuum pressure impregnation, was completed on 1/5 sub-scale rings, and the ring concept, materials, and utilized techniques were shown to be satisfactory [4,5]. These processes allow practically only unidirectional rings, except the outer layers, where radial and axial layers can be applied.…”

Section: Introductionmentioning

confidence: 99%

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The ITER pre-compression rings – A first in cryogenic composite technology

Rajainmäki

Foussat

Rodríguez

et al. 2014

AIP Conference Proceedings

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Abstract. The ITER Pre-Compression Rings represent one of the heaviest composite structures ever manufactured as a single piece and the largest -the outer diameter will be above 5.5 meters -intended for use in a cryogenic environment. With a cross section of 337 mm x 288 mm, each item will weigh more than 3,000 kg. A development program, based on filament wound and dry wound S2 glass unidirectional fibers, the latter processed by VARTM, was completed on one fifth scale rings, and these materials and techniques were shown to be satisfactory. The paper describes how a technology applied to build up primary structures of European launchers is being accommodated to produce the ITER PreCompression Rings, fulfilling its extremely challenging requirements. In addition, we will describe how the structural analysis is correlated with the test results of scaled down rings, as well as how the pre-compression rings' manufacturing process will be qualified.

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Section: Finite Element Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The ITER pre-compression rings – A first in cryogenic composite technology

Rajainmäki

Foussat

Rodríguez

et al. 2014

AIP Conference Proceedings

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“…Standard and non standard samples were prepared from different geometric directions (longitudinal, radial and transversal with reference to the fiber direction) and tested at room temperature and at liquid nitrogen (77 K), following ASTM D5379 for V-notch tests, ASTM D732 for punch tests, and ASTM D695 for compression properties [6].…”

Section: Materials Characterizationmentioning

confidence: 99%

“…ENEA manufactured the first three rings R1, R2 and a spare ring Rs, used for the preparation of several specimens for compression and shear tests of the composite material [6]. The ENEA VPI process consisted of glass winding with pretension around a mould followed by epoxy vacuum pressure impregnation and a final curing for 40 h up to 137 • C. The fiberglass used was S2 (ZenTron ® High Strength Roving AGY 758-AB-675) with UTS of 3600 MPa [7], and Ciba's Araldite epoxy with hardener and flexibilizer.…”

Section: Ring Manufacturementioning

confidence: 99%

Overview of the testing activities on ITER sub-scale pre-compression rings

Rossi

Capobianchi

Crescenzi

et al. 2012

Fusion Engineering and Design

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“…To the best of the authors' knowledge, there have been few studies suggesting this property. Crescenzi et al [23] performed the Iosipescu test and the punch-tool shear test (ASTM D732) in a testing campaign of S-2 glass/epoxy composites. The shear strength measured by the punch-tool shear test was 297 MPa, which was different from the results of the Iosipescu test (49-60 MPa).…”

Section: Introductionmentioning

confidence: 99%

Experimental study on shear-dominant fiber failure in CFRP laminates by out-of-plane shear loading

Yashiro

Ogi

2018

Journal of Composite Materials

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Understanding the shear behavior and resulting fiber failure of fiber-reinforced plastics is required for better prediction of their behavior during the machining process, but knowledge regarding the shear strength of fiber failure is limited. In this study, out-of-plane shear tests were conducted to observe the shear behavior of carbon fiber-reinforced plastic laminates subjected to high shear stress exceeding the shear strength of matrix failure. The longitudinal fibers in carbon fiber-reinforced plastic unidirectional laminates were cut by shear loading without severe internal damage and the maximum shear stress causing progressive fiber breaks was much higher than the shear strength of matrix failure. This result suggested the possibility of out-of-plane shearing as a machining method for fiber-reinforced plastics and shear tests were subsequently performed for carbon fiber-reinforced plastic cross-ply laminates. Delamination was generated by high shear stress to cut the reinforcing fibers, but the size of the remaining damage was small even in the thermoset carbon fiber-reinforced plastic laminates in which delamination likely occurs, without any optimization of the trimming conditions.

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Mechanical characterization of glass fibre–epoxy composite material for ITER pre-compression rings

Cited by 18 publications

References 3 publications

The ITER pre-compression rings – A first in cryogenic composite technology

The ITER pre-compression rings – A first in cryogenic composite technology

Overview of the testing activities on ITER sub-scale pre-compression rings

Experimental study on shear-dominant fiber failure in CFRP laminates by out-of-plane shear loading

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