巻号一覧
39 巻 (2001)
- 6 号 p. 328-
- 5 号 p. 274-
- 4 号 p. 194-
- 3 号 p. 148-
- 2 号 p. 82-
- 1 号 p. 3-
前身誌
39 巻, 5 号
選択された号の論文の5件中1～5を表示しています
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＜論文＞
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柿原 清貴, 山下 洋, 平 忠明原稿種別: その他
専門分野: その他
2001 年 39 巻 5 号 p. 274-280
発行日: 2001年
公開日: 2003/01/31
ジャーナル フリーIn Japan, the first NGV (Natural Gas Vehicle) conversion was carried out from 1991. After the technical standardization of “The High Pressure Gas Safety Law/The Container Safety Regulations” in 1997 and 1998 by MITI, the effort for wide spread use of NGV has been tried in gas, automobile and associated industries. However, the total numbers of NGVs are only just over 5, 500 as of July 2000. Despite widespread environmental support, an important factor limiting the movement to NGV is the fact that economical cylinders are not available in Japan. To apply lighter-weight and lower cost cylinders for NGV service in Japan, the characteristics of the following 2 types of cylinder designs are being researched and tested at Faber in Italy and at Powertech in Canada:
Advanced Type 1 steel cylinder: Maximum tensile strength not greater than 1095N/mm2 according to ANSI/IAS NGV2-1998
Advanced Type 2 steel FRP wrapped: Maximum tensile strength is same as Type 1 steel cylinder.
The KIH value of the Faber cylinder steel (tensile strength of 1095N/mm2) in a 200 bar hydrogen environment tested at Powertech exceeds 145kgf/mm3/2.抄録全体を表示PDF形式でダウンロード (906K) -
三村 宏原稿種別: その他
専門分野: その他
2001 年 39 巻 5 号 p. 281-287
発行日: 2001年
公開日: 2003/01/31
ジャーナル フリーOn the basis of the local stress criterion, Beremin explained successfully scatter and dependence on temperature and plate thickness in fracture toughness. According to the current fracture model of micro-mechanism, however, initiation of cleavage is controlled not only by the local stress but also by plastic strain to induce cracks of cementites as fracture triggers. Furthermore, the critical fracture stress increases with increase in plastic strain. In the present paper a modification of the Beremin model is proposed to take into account these effects of plastic strain on fracture. The new model can predict the above mentioned characteristics of cleavage fracture as well as the Beremin model. In addition, the new model can explain that fracture initiation points may distribute on either side i.e. a near side or a remote side of the stress maximum around notch tip.抄録全体を表示PDF形式でダウンロード (359K) -
中澤 崇徳, 木村 英隆, 小松 肇原稿種別: その他
専門分野: その他
2001 年 39 巻 5 号 p. 288-295
発行日: 2001年
公開日: 2003/01/31
ジャーナル フリーThe effect of grain size on high temperature mechanical properties of low carbon and medium nitrogen type 316 stainless steel (316FR) developed for fast reactor structures has been investigated, compared with conventional type 316 steel (SUS316). Tensile tests at room temperature, 550°C, 600°C, 650°C and creep rupture tests at 550°C and 600°C were conducted, using steels with grain size from 68μm to 620μm. The microstructures of creep ruptured specimens were examined with optical and electron microscopy. The tensile strength of both steels decreased with increasing grain size at all temperatures. 316FR steel showed lower tensile strength than SUS316 steel at high temperatures, while the former had the same tensile strength as the latter at room temperature. The creep rupture strength of both steels decreased with increasing grain size at both temperatures. The rupture strength of 316FR steel was higher than that of SUS 316 steel at 550°C in all grain sizes, while the former was higher than the latter only in the small grain size region at 600°C. The 10000h rupture ductility of both steels decreased with increasing grain size at both temperatures. The decrease of ductility corresponded to the increase of grain boundary fracture. The size and density of carbides on the grain boundary increased with increasing grain size.抄録全体を表示PDF形式でダウンロード (1252K)
＜論説＞
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笠原 直人, 浅山 泰, 森下 正樹原稿種別: その他
専門分野: その他
2001 年 39 巻 5 号 p. 298-310
発行日: 2001年
公開日: 2003/01/31
ジャーナル フリーElevated temperature components must be designed against both pressure and thermal loads. In the case of sodium circuits of fast breeder reactors, a restriction from the pressure load becomes small because of the high boiling point of sodium. Design approaches for thermal loads (displacement-controlled) are compared with those against pressure loads (load-controlled). Considering differences between those two approaches, a concept of the elevated temperature design standard that takes the nature of thermal loads fully into account is propcsed. This concept is a basis of load evaluation techniques and an inelastic analysis guide, that are being developed. Finally, problems and plans to realize the above concept are discussed.抄録全体を表示PDF形式でダウンロード (1347K)
＜講座＞
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荒川 敬弘, 米山 弘志原稿種別: その他
専門分野: その他
2001 年 39 巻 5 号 p. 311-316
発行日: 2001年
公開日: 2003/01/31
ジャーナル フリーThere is deterioration of the quality of the material caused by the initiation and/or growth of cracks such as fatigue and stress corrosion cracks, and micro-damage such as creep and aging damages accumulated during the long term operation at high temperature. Ultrasonic examination is recognized as the only evaluation technique of the inside damage. While the radiographic examination projects the plane image of the flaw, it cannot measure the flaw height in the plate thickness direction precisely. This paper introduces the ultrasonic TOFD (time-of-flight diffraction) method as the precise monitoring technique of the crack size and the noise analysis method which evaluates material degradation such as creep damage.抄録全体を表示PDF形式でダウンロード (736K)
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