An overview of tritium retention in dust particles from the JET-ILW divertor

2021 ◽  
Author(s):  
Teppei Otsuka ◽  
Suguru Masuzaki ◽  
N Ashikawa ◽  
Yuji Torikai ◽  
Yuji Hatano ◽  
...  
Keyword(s):  
Fibre Composite ◽  
Dust Particles ◽  
Imaging Plate ◽  
Wall Jet ◽  
Carbon Fibre Composite ◽  
Dominant Component ◽  
Retention Characteristics ◽  
Main Component ◽  
Micro Analysis ◽  
Coated Carbon

Abstract Tritium (T) retention characteristics in dust collected from the divertor in JET with ITER-like wall (JET-ILW) after the third campaign in 2015-2016 (ILW-3) have been examined in individual dust particles by combining radiography (tritium imaging plate technique) and electron probe micro-analysis. The results are summarized and compared with the data obtained after the first campaign in 2011-2012 (ILW-1). The dominant component in ILW-1 dust was carbon (C) originating from tungsten-coated carbon fibre composite (CFC) tiles in JET-ILW divertor and/or legacy of C dust after the JET operation with carbon wall. Around 85 % of the total tritium retention in ILW-1 dust was attributede to the C dust. The retention in tungsten (W) and beryllium (Be) dominated particles was 100 times smaller than the highest T retention in carbon-based particles. After ILW-3 the main component contributing to the T retention was W. The number of small W particles with T increased, in comparison to ILW-1, most probably by the exfoliation and fragmentation of W coatings on CFC tiles though T retention in individual W particles was smaller than in C particles. The detection of only very few Be-dominated dust particles found after ILW-1 and ILW-3 could imply stable Be deposits on the divertor tiles.

Carbon fibre composite development for in-ground UAV’s with NACA0012 aerofoil wing

2021 ◽  
Author(s):  
Ajanas Saludheen ◽  
Firaz Muhammed Zakariya ◽  
M Ankith ◽  
Nirmal Nandakumar ◽  
Jais George ◽  
...  
Keyword(s):  
Carbon Fibre ◽  
Fibre Composite ◽  
Carbon Fibre Composite

Dynamic Axial Compression of Square CFRP/Aluminium Tubes

2019 ◽  
Vol 794 ◽  
pp. 202-207
Author(s):  
Rafea Dakhil Hussein ◽  
Dong Ruan ◽  
Guo Xing Lu ◽  
Jeong Whan Yoon ◽  
Zhan Yuan Gao
Keyword(s):  
Energy Absorption ◽  
Specific Energy ◽  
Fibre Composite ◽  
Dynamic Tests ◽  
Carbon Fibre Composite ◽  
Specific Energy Absorption ◽  
Static Tests ◽  
Crushing Force ◽  
Cfrp Tubes ◽  
The Impact

Carbon fibre composite tubes have high strength to weight ratios and outstanding performance under axial crushing. In this paper, square CFRP tubes and aluminium sheet-wrapped CFRP tubes were impacted by a drop mass to investigate the effect of loading velocity on the energy absorption of CFRP/aluminium tubes. A comparison of the quasi-static and dynamic crushing behaviours of tubes was made in terms of deformation mode, peak crushing force, mean crushing force, energy absorption and specific energy absorption. The influence of the number of aluminium layers that wrapped square CFRP tubes on the crushing performance of tubes under axial impact was also examined. Experimental results manifested similar deformation modes of tubes in both quasi-static and dynamic tests. The dynamic peak crushing force was higher than the quasi-static counterpart, while mean crushing force, energy absorption and specific energy absorption were lower in dynamic tests than those in quasi-static tests. The mean crushing force and energy absorption decreased with the crushing velocity and increased with the number of aluminium layers. The impact stroke (when the force starts to drop) decreased with the number of aluminium layers.

Hygrothermal effects on painted carbon fibre composite surfaces

2012 ◽  
Vol 47 (5) ◽  
pp. 539-547 ◽  
Author(s):  
ML de Souza ◽  
JI Mardel ◽  
BL Fox
Keyword(s):  
Carbon Fibre ◽  
Fibre Composite ◽  
Carbon Fibre Composite

Hydraulic and Pneumatic Pressure Cycle Life Test Results on Composite Reinforced Tanks for Hydrogen Storage

2016 ◽  
Author(s):  
Nerea de Miguel ◽  
Georg Mair ◽  
Beatriz Acosta ◽  
Mariusz Szczepaniak ◽  
Pietro Moretto
Keyword(s):  
Fibre Composite ◽  
Cycle Life ◽  
Carbon Fibre Composite ◽  
Design Qualification ◽  
Pressure Cycle ◽  
Life Tests ◽  
Metal Liner ◽  
Type 3 ◽  
Polymer Liner ◽  
Composite Cylinders

Current standards governing the design, qualification and in-service inspection of carbon fibre composite cylinders do not facilitate to optimise cylinder design. The requirements have been adapted from standards for metallic cylinders and cannot easily quantify the degradation processes in composite materials. In this article, the results of hydraulic and hydrogen pressure cycle life tests performed on composite reinforced tanks with a metal liner (type 3) and with a high density polymer liner (type 4) are shown. Moreover, the degradation measured by means of residual strength of the tanks after the cycling tests have been compared. It has been found that the most critical aging for metal based composite cylinder is the gaseous cycling while type 4 designs seem to be more sensitive to hydraulic cycling at high temperature.

Sign in / Sign up

Export Citation Format

Share Document