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| An ion-accelerator driven high-energy intense neutron source has
been planned for irradiation experiments of fusion materials.
Irradiation volume in this system, however, is quite limited;
therefore, it is inevitable to use miniaturized specimens in the
size of 0.1 to 1 mm in order to irradiate many samples. In addition,
the technology is also beneficial for the application to light
water reactor. The miniaturized specimens make possible to increase
the number of surveillance test samples and to reduce radioactive
wastes. The development of remote operation techniques and equipment is necessary, because of the limited ability of specimen manipulation in current hot cells. The development of a small punch testing apparatus, electrical discharge machining device, and a computer-aided microma-nipulator for handling the miniaturized specimens has been successfully carried out at the hot laboratory in the Oarai Research Establishment JAERI. By using a small punch testing apparatus, load-displacement curves during test are obtained from the displacement of the puncher and the punching force to the specimen. The deformation of the specimen is similar to that of the "bulge test." The "bulge test" is a testing method to evaluate the formability of materials standardized in JIS. By analyzing the curves, ductile to brittle transition temperature, fracture toughness, and so forth can be obtained. Furthermore, the technology development for hardness tests, impact tests and so forth, with miniaturized specimens is being planned. |
| Reference M. Ohmi et al., Development of Small Specimen Test Techniques Development of a Remote Controlled Small Punch Testing Apparatus, Nippon Genshiryoku Gakkai-Shi, 39 (11), 966 (1997). |
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Persistent Quest-Research Activities 1998 Copyright(c)Japan Atomic Energy Research Institute |