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Title: Irradiation Effect of 14 MeV Neutron on Interlaminar Shear Strength of Glass Fiber Reinforced Plastics

Abstract

Design activity of International Thermonuclear Experimental Reactor clarifies intense neutron streaming from ports for neutral beam injectors. Energy spectrum of the streaming is very wide and 14 MeV neutron and gamma ray are the typical radiations. Large amount of glass fiber reinforced plastics will be used in a superconducting magnet system as an electric insulation material and a support structure, for such organic material is easy to manufacture, and light and cheap. In this report, effects of 14 MeV neutron and gamma ray irradiation on interlaminar shear strength and fracture mode are investigated using G-10CR small specimen of which configuration was proposed as a standard for evaluation of the interlaminar shear strength. A short beam test under three point bending was conducted at room temperature and 77 K. Neutron fluence of 3.91 x 1019 n/m2 was irradiated and the specimens did not show clear degradation of the strength. On the other hand, gamma ray irradiation of 1 MGy made the specimen weaker and 10 MGy caused delamination. Most of the specimens showed both of interlaminar cracking and bending fracture, but some specimens were fractured with irregular shear occurred on the planes connecting loading point and supporting points.

Authors:
; ; ; ;  [1];  [2];  [3];  [4];  [5]; ; ;  [6]
  1. National Institute for Fusion Science, Toki, Gifu, 509-5292 (Japan)
  2. Osaka University, Suita, Osaka, 565-0871 (Japan)
  3. Iwate University, Ueda, Morioka, 020-8551 (Japan)
  4. National Institute for Materials Science, Tsukuba, Ibaraki, 305-0047 (Japan)
  5. Tohoku University, Sendai, Miyagi, 980-8579 (Japan)
  6. Japan Atomic Energy Research Institute, Nakagun, Ibaraki, 319-1195 (Japan)
Publication Date:
OSTI Identifier:
20800172
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 824; Journal Issue: 1; Conference: Cryogenic engineering conference, Keystone, CO (United States), 29 Aug - 2 Sep 2005; Other Information: DOI: 10.1063/1.2192357; (c) 2006 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; BENDING; CRACKING; DESIGN; ENERGY SPECTRA; EVALUATION; FIBERGLASS; FRACTURES; GAMMA RADIATION; GLASS; IRRADIATION; ITER TOKAMAK; MEV RANGE; NEUTRON FLUENCE; NEUTRONS; PHYSICAL RADIATION EFFECTS; REINFORCED PLASTICS; SHEAR; SHEAR PROPERTIES; SUPERCONDUCTING MAGNETS

Citation Formats

Nishimura, A., Hishinuma, Y., Seo, K., Tanaka, T., Muroga, T., Nishijima, S., Katagiri, K., Takeuchi, T., Shindo, Y., Ochiai, K., Nishitani, T., and Okuno, K. Irradiation Effect of 14 MeV Neutron on Interlaminar Shear Strength of Glass Fiber Reinforced Plastics. United States: N. p., 2006. Web. doi:10.1063/1.2192357.
Nishimura, A., Hishinuma, Y., Seo, K., Tanaka, T., Muroga, T., Nishijima, S., Katagiri, K., Takeuchi, T., Shindo, Y., Ochiai, K., Nishitani, T., & Okuno, K. Irradiation Effect of 14 MeV Neutron on Interlaminar Shear Strength of Glass Fiber Reinforced Plastics. United States. doi:10.1063/1.2192357.
Nishimura, A., Hishinuma, Y., Seo, K., Tanaka, T., Muroga, T., Nishijima, S., Katagiri, K., Takeuchi, T., Shindo, Y., Ochiai, K., Nishitani, T., and Okuno, K. Fri . "Irradiation Effect of 14 MeV Neutron on Interlaminar Shear Strength of Glass Fiber Reinforced Plastics". United States. doi:10.1063/1.2192357.
@article{osti_20800172,
title = {Irradiation Effect of 14 MeV Neutron on Interlaminar Shear Strength of Glass Fiber Reinforced Plastics},
author = {Nishimura, A. and Hishinuma, Y. and Seo, K. and Tanaka, T. and Muroga, T. and Nishijima, S. and Katagiri, K. and Takeuchi, T. and Shindo, Y. and Ochiai, K. and Nishitani, T. and Okuno, K.},
abstractNote = {Design activity of International Thermonuclear Experimental Reactor clarifies intense neutron streaming from ports for neutral beam injectors. Energy spectrum of the streaming is very wide and 14 MeV neutron and gamma ray are the typical radiations. Large amount of glass fiber reinforced plastics will be used in a superconducting magnet system as an electric insulation material and a support structure, for such organic material is easy to manufacture, and light and cheap. In this report, effects of 14 MeV neutron and gamma ray irradiation on interlaminar shear strength and fracture mode are investigated using G-10CR small specimen of which configuration was proposed as a standard for evaluation of the interlaminar shear strength. A short beam test under three point bending was conducted at room temperature and 77 K. Neutron fluence of 3.91 x 1019 n/m2 was irradiated and the specimens did not show clear degradation of the strength. On the other hand, gamma ray irradiation of 1 MGy made the specimen weaker and 10 MGy caused delamination. Most of the specimens showed both of interlaminar cracking and bending fracture, but some specimens were fractured with irregular shear occurred on the planes connecting loading point and supporting points.},
doi = {10.1063/1.2192357},
journal = {AIP Conference Proceedings},
number = 1,
volume = 824,
place = {United States},
year = {Fri Mar 31 00:00:00 EST 2006},
month = {Fri Mar 31 00:00:00 EST 2006}
}
  • It is known that an organic material is damaged by gamma ray irradiation, and the strength after irradiation has dependence on the gamma ray dose. These issues are important not only to make global understanding of electric insulating performance of glass fiber reinforced plastics (GFRP) under irradiation condition but also to develop new insulation materials. This paper presents the dependence of fracture mode and interlaminar shear strength (ILSS) on the material and the gamma ray irradiation effect on the fracture mode and the ILSS. 6 mm radius loading nose and supports were used to prompt ILS fracture for a shortmore » beam test. A 2.5 mm thick small specimen machined out of a 13 mm thick G-10CR GFRP plate (sliced specimen) showed lower ILSS and translaminar shear (TLS) fracture, although the same size specimen prepared from a 2.5 mm G-10CR GFRP plate (non-sliced specimen) showed ILS fracture and the higher ILSS. Both type of specimens showed the degradation of ILSS after gamma ray irradiation. The fracture mode of the non-sliced specimen changed from ILS to TLS fracture and no bending fracture was observed. The resistance to shear deformation of glass cloth/epoxy laminate structure would be damaged by the irradiation.« less
  • The mechanical properties of several glass fiber reinforced plastics (FRPs) were investigated prior to and following neutron and gamma irradiation using the short beam shear (ASTM D2344) and the three point bending test (ASTM D790). The irradiations were carried out at room temperature and at low temperature (5 K) with different reactor spectra up to a fast neutron fluence of 5x10{sup 22} m{sup -2} (E> 0.1 MeV). The samples were measured at 77 K, those subjected to low temperature irradiation were measured before and after an annealing cycle to room temperature. Special attention was paid to the influence of themore » boron (n, {alpha})-reaction on the interlaminar shear strength, which occurs in E-glass, but not in boron free S- and T-glass reinforcements.« less
  • A glass fiber reinforced plastic (GFRP) with cyanate ester resin was fabricated and neutron irradiation tests up to 1x10{sup 22} n/m{sup 2} of fast neutron with over 0.1 MeV energy were carried out in fission reactor. The fabrication process of cyanate ester GFRP was established and a collaboration network to perform investigations on irradiation effect of superconducting magnet materials was constructed. Three kinds of samples were fabricated. The first was CTD403 GFRP made by NIFS, the second was (cyanate ester+epoxy) GFRP provided by Toshiba, and the last was CTD403 GFRP made by Toshiba. The irradiation was carried out at JRR-3more » in Japan Atomic Energy Agency using Rabbit capsules.After the irradiation, short beam tests were conducted at room temperature and 77 K and interlaminar shear strength (ILSS) was evaluated. The irradiation of 1x10{sup 21} n/m{sup 2} increased ILSS a little but 1x10{sup 22} n/m{sup 2} irradiation decreased ILSS to around 50 MPa. These tendencies were observed in all three kinds of GFRPs.« less
  • In recent years, composites have increasingly been used in structures which are subjected to intensive dynamic loads. This has made it necessary to study the strength properties of composites under such loading conditions. A problem which has arisen concurrently is the generalization of established representations of the effect of adhesive-cohesive forces of interaction on strength to the region of short times-to-failure (down to 10{sup {minus}6} sec or less) and, accordingly, high loading rates. These problems are very complicated, not only because of the specific structure of composites and the range of factors which affect their properties and behavior under differentmore » conditions, but also because of the increasing difficulties encountered in experimental studies conducted at high loading rates (this also applies to in situ observations). Even for traditional materials (metals, polymers, etc.), these problems have been solved only relatively recently. The present study should probably be regarded then as a first attempt to solve these problems for certain glass-fiber-reinforced plastics. In order to obtain a more complete picture of the changes in strength which take place, along with dynamic tests, the authors conducted tests under quasistatic conditions. Also, in order to determine whether adhesive or cohesive forces were the main factor in determining strength in a given situation, they conducted parallel tests of model systems and of specimens composed of just the binder (in the cured state). All of the tests were conducted using a simple loading scheme - in tension along planes parallel to the layers of the glass cloth or the plane of adhesive contact.« less
  • The chemical treatment of carbon fibers used in carbon fiber-epoxy matrix composites greatly affects the fraction of hydrogen bonds (H-bonds) formed at the fiber-matrix interface. The H-bonds are major contributors to the fiber-matrix interfacial shear strength and play a direct role in the interlaminar shear strength (ILSS) of the composite. The H-bond contributions τ to the ILSS and magnitudes K{sub N} of the fiber-matrix interfacial stiffness moduli of seven carbon fiber-epoxy matrix composites, subjected to different fiber surface treatments, are calculated from the Morse potential for the interactions of hydroxyl and carboxyl acid groups formed on the carbon fiber surfacesmore » with epoxy receptors. The τ calculations range from 7.7 MPa to 18.4 MPa in magnitude, depending on fiber treatment. The K{sub N} calculations fall in the range (2.01 – 4.67) ×10{sup 17} N m{sup −3}. The average ratio K{sub N}/|τ| is calculated to be (2.59 ± 0.043) × 10{sup 10} m{sup −1} for the seven composites, suggesting a nearly linear connection between ILSS and H-bonding at the fiber-matrix interfaces. The linear connection indicates that τ may be assessable nondestructively from measurements of K{sub N} via a technique such as angle beam ultrasonic spectroscopy.« less