巻号一覧
42 巻 (2004)
- 6 号 p. 310-
- 5 号 p. 252-
- 4 号 p. 178-
- 3 号 p. 106-
- 2 号 p. 60-
- 1 号 p. 4-
前身誌
42 巻, 5 号
選択された号の論文の6件中1～6を表示しています
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論文
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福長 脩2004 年 42 巻 5 号 p. 252-260
発行日: 2004年
公開日: 2004/12/10
ジャーナル フリーShape parameters for the geometrical design of tungsten carbide anvil and cylinder core of flat-belt (FB) type high pressure apparatus were presented. The anvil shape parameters were derived from anvil top diameter, anvil diameter and two tapered angles. The cylinder core parameters were determined using initial anvil distance LA and initial thickness of inner compressible gasket hG0. Newly presented shape parameters of anvil, cylinder core and compressible gasket are useful to design various versions of belt type apparatus including large ratio of initial sample length to the anvil top diameter (LA⁄dA).抄録全体を表示PDF形式でダウンロード (217K) -
寺本 徳郎, 倉嶋 寛貴, 塚本 雅敏2004 年 42 巻 5 号 p. 261-268
発行日: 2004年
公開日: 2004/12/10
ジャーナル フリーRecently, aluminum alloy is often used as structural material not only in aerospace vehicle but in high speed train and LNG tanker etc. to reduce environmental load. In order to evaluate the dependence of strain rate upon fracture toughness for aluminum alloy, A2014-T4, both dynamic tensile and fracture tests were carried out ranging from low to high strain rate. As a result, the yield stress was almost constant independent of strain rate but the elongation decreased with increasing strain rate. The fracture toughness also decreased with increasing strain rate and reached a certain value at high strain rate. While the specimen was fractured almost in a brittle manner for all strain rates, the SEM observation on the fracture surface proved a ductile dimple pattern even at high strain rate. In addition, finite element stress analysis which included the effect of heat rise by plastic deformation was performed to inspect the validity of experimental fracture toughness according to JSME standard.抄録全体を表示PDF形式でダウンロード (278K) -
寺本 徳郎, 土居 崇, 鈴木 隆之2004 年 42 巻 5 号 p. 269-275
発行日: 2004年
公開日: 2004/12/10
ジャーナル フリーThe aim of this study is to experimentally estimate the degradation of austenitic stainless steel;that is, residual plastic strain, martensitic transformation and fatigue damage at room and low temperatures, by using impedance method. In particular, the change of very small coil impedance was found at low temperature to correspond not only with plastic strain distribution but also with magnetization distribution, representing martensitic transformation. The fatigue test at low temperature showed an excellent correlation between impedance measurement and applied stress intensity along fatigue crack extension path. In addition, the impedance distribution agreed well with martesitic volume fraction estimated by X-ray diffraction method. Namely, in above two cases, it is revealed that the impedance method by this measuring system brings an accurate estimation of degradation of austenitic stainless steel with high resolution ability of location. Next, at room temperature, the coil impedance increased with increasing stress or strain and its change corresponded with the beginning and extension of plastic yielding. We conclude that this method can detect small amount of strain induced martensite even at room temperature.抄録全体を表示PDF形式でダウンロード (186K) -
-第1報 ステンレス鋼オーバーレイ部における水素の集積挙動の理論解析-茅野 林造, 森 裕章, 吾郷 哲郎, 西本 和俊2004 年 42 巻 5 号 p. 276-283
発行日: 2004年
公開日: 2004/12/10
ジャーナル フリーIn domestic petroleum refinery, many equipments have already operated for long time over ten of year, and they were needed to investigate material properties and serviceability assessment after repair welding and re-operation because of the recent trend of long term continuous operation and extension of inspection period. In this study, purpose was theoretical elucidation of hydrogen behavior in repair welding for the damaged equipments. As the result of microstructure observation and hardness distribution measurement of the cross section for analytical model construction, carbide layer and remarkable hardening was observed in the overlay and base metal interface. Then, three layers such as overlay, carbide layer and the base metal was supposed, and void fraction from the hardness with lattice defect was given for the analytical model considering the effect of microstructure and hardening. The hydrogen concentration distribution was obtained in the process in long term operation in high temperature high pressure hydrogen environment, shutdown and repair welding using material diffusion equation which made the activity to be a variable. It was clear that higher concentration hydrogen at the interface was maintained after repair welding from the theoretical analysis result.抄録全体を表示PDF形式でダウンロード (299K)
解説
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(第一報 ベイズの定理の原理)酒井 信介2004 年 42 巻 5 号 p. 284-290
発行日: 2004年
公開日: 2004/12/10
ジャーナル フリーRisk index has been becoming important in the management of plant equipments. Through the investigation activity named RBM committee, it has been clarified the one of the most difficult items to introduce RBI techniques to Japan is the establishment of data for probability of failure (PoF) . In order to establish PoF data, it is required to estimate it from few observed data. In US and European countries, Bayesian theorem has been widely used for this purpose. Since the theorem might become important as the risk management prevails in Japan, the fundamental principle is explained here.抄録全体を表示PDF形式でダウンロード (74K)
紹介
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山下 直彦2004 年 42 巻 5 号 p. 291-296
発行日: 2004年
公開日: 2004/12/10
ジャーナル フリーFounded in 1902, Air Liquide is the world leader in industrial and medical gases and related services. The recent activities related with hydrogen technology in Air Liquide group are reviewed concerning fuel cell, hydrogen test facility and hydrogen fueling stations. A simulation tool concerning hydrogen gas fast filling is described in details.抄録全体を表示PDF形式でダウンロード (112K)
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