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小豆島 明, 青木 孝史朗, 高柳 朋博, 雨宮 貴之
原稿種別: 本文
p.
197-198
発行日: 2003/10/17
公開日: 2017/06/19
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In order to improve the tribological and mechanical properties of machine parts, surface modification methods adopted in a wide range of applications. For example, TiN coating has been used as a wear-resistant coating. In this paper, TiN films are deposited by physical vapor deposition (PVD) especially are ion plating. The principal advantage of this method is to deposit coatings at lower temperature. The aim of this study is to investigate the adhesion of PVD hard coatings. New indentation tester with acoustic emission sensor is made to measure the adhesion and fatigue property of the coatings. TiN films are deposited on the WC substrate. In these experiments, deposition time is changed in the range of 5min to 35min to control the several film thicknesses and bias voltage was changed in the range of -50V to -200V. indentation test, repeated load test and SEM observations of the surfaces of them are carried out, then these results are compared.
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秋田 貢一, 杉崎 大修, 大谷 眞一, 萩原 芳彦, 上田 譲
原稿種別: 本文
p.
199-200
発行日: 2003/10/17
公開日: 2017/06/19
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The residual stresses on aluminum wiring in a resonance scanning mirror, which is one of micro electro mechanical systems (MEMS), were measured using a synchrotron radiation source. The aluminum wiring has the width of 40μm and the thickness of 4μm. The aluminum wiring was deposited by a sputtering method on a silicon substrate. The tensile residual stress was occurred on the aluminum wire and it decreased when the fatigue loading was applied. The subgrain was observed on the aluminum wiring after fatigue using micro-beam synchrotron diffraction technique.
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石黒 智明, 松岡 信一
原稿種別: 本文
p.
201-202
発行日: 2003/10/17
公開日: 2017/06/19
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It is investigated that the effect of the anodizing time (0-60min) and the dipping time (5-20min) in oxalic solution bath on the film structure and the alkali resistance time of the anodic oxide aluminum after hydrothermal treatment at 150℃. By means of SEM obserbation of cross-scction of the film, in the ease of the thick film, the columnar layer was disappeared. The alkali resistance time was effected the dense layer thickness which was calculated by the subtraction columnar layer thickness from film thickness. And the value which was divided the alkali resistance time by dense layer thickness became about 1.3ks/μm between 10min and 35min for anodizing and dipping, respectively.
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松崎 智美, 上原 賢一, 三原 雄司, 染谷 常雄
原稿種別: 本文
p.
203-204
発行日: 2003/10/17
公開日: 2017/06/19
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A thin-film pressure sensor for measuring oil-film pressure in piston pin boss of automobile engine has been developed. The manufacturing method and the structure were improved than those of sensors for bearing metals. The sensor is about 6∿7 micro-meters in thickness and consist of aluminum oxide film, aluminum nitride film and Cu-Mn-Ni alloy for pressure detective film. As for a problem on pin holes created in isolation layers of AIN and Al_2O_3 by reactive spattering, alternation of sputtering gas volume and the number of ultrasonic washing were available for reducing the dust creation and they caused high isolation resistance layers. The number of times of annealing for new developed sensors applying AIN and Al_2O_3 made it possible to reduce the both of temperature and pressure characteristics change of sensors. This paper is represented the manufacturing method, the structure and the sensor characteristics of the sensor.
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池田 隆二, 長 秀雄, 澤邊 厚仁, 竹本 幹男
原稿種別: 本文
p.
205-206
発行日: 2003/10/17
公開日: 2017/06/19
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気相蒸着法で堆積したSi_3N_4やダイヤモンド膜の膜のみをパルスレーザ・アブレーションを利用して切断・穿孔した。Si_3N_4膜では1回のレーザ照射による加工深さには限界があった。ダイヤモンド膜では250mJの点集光照射でも表面が黒鉛化するのみで穿孔は不可能であったが, 低エネルギーレーザを繰返し照射することによって穿孔や切断に成功した。また, これら硬質膜の残留応力分布を薄膜のみを切断することにより評価した。得られた結果は成膜雰囲気から予想される傾向と一致した。
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岩重 景, 青木 佑一, 大竹 尚登
原稿種別: 本文
p.
207-208
発行日: 2003/10/17
公開日: 2017/06/19
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In this study, we investigated electrical properties of amorphous carbon (a-C : H) films fabricated by plasma CVD. First, photovoltaic cells consisting of Au/ a-C : H films / n-Si (p-Si) /In-Ga films were fabricated with changing deposition condition. Deposition of a-C"H films were performed using methane as a source gas. Nitrogen and tri-methyl boron (TMB) were also used as the doping gases. Under the light illumination (Xe are lamp at 100mW/cm^2), this cell shows photovoltaic behavior with short circuit current of 0.3mA/cm^2,open circuit voltage of 0.3V and energy conversion efficiency of 0.023%. Secondly, we investigated field emission from a-C : H on ITO films. The film shows field emission at the surface potential barrier of 4∿4.5eV.
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福本 昌宏, 中谷 敏之, 扇谷 一慶, 安井 利明
原稿種別: 本文
p.
209-210
発行日: 2003/10/17
公開日: 2017/06/19
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In the flattening of thermal sprayed particles onto the flat substrate surface, critical conditions were recognized both in the substrate temperature and the ambient pressure. That is, the flattening behavior changed transitionally on the critical temperature and pressure range, respectively. A transition temperature, Tt, and a transition pressure, Pt, for those critical conditions were defined and introduced, respectively, Equivalence in the dependence both of transition temperature and transition pressure on the sprayed material's order indicated that the wetting of the substrate by the molten particle is a common domination in the flattening. Three dimensional transition map by combining both transition behavior in the flattening was proposed as a controlling principle for the thermal spray process.
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斉藤 正弘, 高橋 伸二, 村田 省三
原稿種別: 本文
p.
211-212
発行日: 2003/10/17
公開日: 2017/06/19
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FeNiCrMoV and WC-NiCr coatings were deposited using the high velocity oxygen fuel (HVOF) spray process under different spray parameters with powders of different size to clarify the influence of the melting state of spray particles on the adhesive strength of the coating. The adhesive strength of the coating was estimated according to the Pin test method. The melting state of the spray droplet was examined from the coating microstructure. It was found that melting state of spray particles had a significant effect on the adhesive strength of HVOF sprayed Fe-based coatings. It can be suggested that good melting of the spray particle is mainly related to the mechanical interlocking effect, which reaches the limited and approximately defined adhesive strength up to 20-30 MPa.
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村上 健児, 星山 康洋, 三宅 秀和, 中嶋 英雄
原稿種別: 本文
p.
213-214
発行日: 2003/10/17
公開日: 2017/06/19
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Ni-C base alloys and Co-C base alloys are plasma sprayed and the structure and the properties of the coatings are studied. The as-sprayed coatings on a water-cooled substrate are supersaturated with alloying elements, and graphite and chromium carbides precipitate on heat treatment. The hardness of the coating becomes higher with increasing chromium content of the alloy due to the formation of hard chromium carbides. Although the hardness of the Ni-29wt%Cr-1.5wt%C alloy coating is nearly the same as that of Co-29wt%Cr-1.5wt%C alloy coating, the former alloy coating with finer microstructure has higher wear resistance.
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榊 和彦, 田島 朋裕, 李 虹, 新海 修平, 清水 保雄
原稿種別: 本文
p.
215-216
発行日: 2003/10/17
公開日: 2017/06/19
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In cold spray method, a coating is formed by exposing a substrate to high velocity solid-phase particles, which have been accelerated by supersonic gas flow at a temperature much lower than the melting or softening temperature of the feedstock. In this study, experiments investigated the influence of the substrate conditions, such as temperature, roughness, thickness and materials of substrate, on properties of copper and titanium coatings sprayed by cold spray. With increasing preheated substrate temperature, titanium deposition efficiency increse but copper deposition efficiency decrese. So, the result is different by the material. With increse gun traverse speed, deposition efficiency of titanium and copper decrese rapidly.
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久保 貴博, 高木 圭介, 北山 和弘
原稿種別: 本文
p.
217-218
発行日: 2003/10/17
公開日: 2017/06/19
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The application of thermal barrier coatings (TBCs) has expanded to even the rotating blades of the latest gas turbines. TBC damage evaluation and repair technique are therefore highly important for safe plant operation. Spallation of the coating layer represents critical damage of TBC. For damage diagnosis, it is necessary to detect delamination under the TBC. In order to detect delamination under the TBC on entire blade surface, mirror-reflected infrared imaging technique has been developed. It was validated that mirror-reflected infrared imaging technique could detect TBC delaminations on entire blade surface by inspection tests using of actual blade shape sample.
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尾和 智信, 篠田 剛, 滝澤 秀一
原稿種別: 本文
p.
219-220
発行日: 2003/10/17
公開日: 2017/06/19
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We suggested the deposition process of intermetallic compounds on substrates such as carbon steel using the plasma transferred are (PTA) surfacing process. The deposition process of NiAl intermetallic layer on carbon steel by the PTA process was investigated. Physically mixed powder of nickel and aluminum was fed into the plasma during the PTA process. The resistance to oxidation was evaluated by measuring thickness of oxide films. The results revealed that the PTA deposit showed large-sized equiaxed and columnar structure, and was indentified as NiAl and Fe3Al by an XRD analysis. It is also revealed that the NiAl alloy deposits were potential for oxidation-resistant applications with suitable process parameters, i.e. low dilution.
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三村 耕司, 楳田 努, 三宅 重之, 谷村 眞治
原稿種別: 本文
p.
221-222
発行日: 2003/10/17
公開日: 2017/06/19
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Low yield strength steels were now often introduced as effective materials for 'plastic damping systems' in the anti-seismic hazard. In the present work, LYP 100 and 225 were chosen as test materials, and their strain rate sensitivity, strain history-and strain rate history-dependencies on flow stresses were clarified through strain rate jump tests for the prestraining specimen in the different prestraining directions
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横山 隆
原稿種別: 本文
p.
223-224
発行日: 2003/10/17
公開日: 2017/06/19
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Impact tensile properties of an extruded ZK60 magnesium alloy for structural uses are determined using a tensile split Hopkinson bar. Tension specimens machined along the axial and radial directions of the extruded ZK60 magnesium alloy bar are used in the static and impact tests. The effects of strain rate and anisotropy on the tensile characteristics are examined. It is shown that the extruded ZK60 magnesium alloy exhibits a different tensile stress-strain behavior in the axial and radial directions. The reason for the strong anisotropy is discussed based on the X-ray diffraction studies.
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小林 秀敏, 臺丸谷 政志
原稿種別: 本文
p.
225-226
発行日: 2003/10/17
公開日: 2017/06/19
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In this research, the dynamic and quasi-static deformations of aluminium honeycomb sandwich panels in three point bending were investigated experimentally. The load, the deflection of a loading point and the strain response of the rear surface plate at various locations were measured. A peak load caused by local plastic buckling of the cores just under the loading point appeared in the early stage of both dynamic and quasi-static bending. The peak load observed at dynamic rates was about 10∿20 % greater than that obtained from static tests. The absorbed energy in the dynamic deformation was also larger than that obtained in static tests. From the change of the strains of the rear surface plate, it was found that the third or higher deformation mode occurred during the early stage of dynamic bending, although only the first mode was observed in static tests.
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楳田 努, 梅嵜 祐樹, 三村 耕司
原稿種別: 本文
p.
227-228
発行日: 2003/10/17
公開日: 2017/06/19
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To examine axial crushing behaviors of thin-walled structures under high strain rate conditions, a series of numerical simulations of the axial dynamic crushing tests of elemental thin-walled circular tubes were conducted. In order to evaluate the energy absorbing abilities of those specimens, especially, we paid attention to the relation between the absorbed energy per unit volume and the ratio of thickness to diameter, besides the effect of strain rate dependence of specimen material. The effect of rising time of applied velocity was also examined.
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横山 隆, 森脇 直樹
原稿種別: 本文
p.
229-230
発行日: 2003/10/17
公開日: 2017/06/19
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Damages of laminated composites subjected to impact loading are evaluated using the stress reversal split Hopkinson bar. Three types of laminated composites with nearly 2mm thickness are used in the impact test. The impact absorbed energy for 40mm square laminated composite is determined. From the dynamic compressive stress-strain hysteresis loop. It is shown that the impact area of a plain-weave carbon/epoxy laminated composite is larger than that of a cross-ply carbon/epoxy laminated composite under the same impact loading condition.
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琵琶 志朗, 渡辺 由布, 元木 信弥, 大野 信忠
原稿種別: 本文
p.
231-232
発行日: 2003/10/17
公開日: 2017/06/19
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The influence of the particle size and the volume fraction on the ultrasonic attenuation in particle-reinforced polymer-based composite materials has been studied. A theoretical model has been formulated to analyze the attenuation of the longitudinal ultrasonic wave in particulate polymer composites. The analysis has shown that the relative change of the attenuation coefficient due to the change in the particle fraction is governed by non-dimensional parameter giving the ratio between the particle radius and the wavelength in the matrix. Based on this model, experimental results for longitudinal attenuation coefficients in particulate composites are disussed. The theoretical results are found to be in qualitative agreement with the experimental results.
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伊達 秀文, 二川 正敏
原稿種別: 本文
p.
233-234
発行日: 2003/10/17
公開日: 2017/06/19
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The impact erosion tests were carried out in mercury by using the direct tension test apparatus converted the Split Hopkinson Pressure Bar method to investigate the formation behavior of the pits. The stainless steel specimen that was screwed at the end of the elastic bar was immersed in mercury. The polished surface of the specimen was eroded by tensile waves propagating through the interference of the solid and liquid metals. The relationship between the mass loss due to the pits formation and the shot number was described with a linear function in logarithm graph, and the mass loss depends on the applied stress level. The maximum pits were present around the center of the specimen and the pit was developed with the increase of the shot number. The distribution of the relatively large pits was very dependent on the position of specimen in the mercury container.
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永井 光輝, 臺丸谷 政志, 小林 秀敏
原稿種別: 本文
p.
235-236
発行日: 2003/10/17
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川越 陽一, 高橋 千織, 古谷 典ゆき, 千田 哲也, 足立 幸志
原稿種別: 本文
p.
237-238
発行日: 2003/10/17
公開日: 2017/06/19
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Alumina often exhibits a very low wear rate when it slides against the same material at room temperature or above 800℃. Wear surface of alumina in this mild wear regime at room temperature was investigated by TEM. A thin layer with a very fine grain size structure was observed on the top surface. Dislocations were present in the bulk surface under the layer. These observations suggest that the film may act as a protective coating during the sliding contact to suppress the crack initiation on the wear surface.
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村田 彰宏, 松岡 敬, 坂口 一彦, 渡辺 博行, 向井 敏司
原稿種別: 本文
p.
239-240
発行日: 2003/10/17
公開日: 2017/06/19
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In this study, casting material of AZ91 alloys have used as test specimens. Four kinds of test specimens aging-treated at 150℃, 175℃, 225℃ and 300℃ for 100 hours were used. The effect of temperature on accelerated aging on their friction and wear properties were evaluated by a pin-on-disk tester under dry condition at room temperature. As a result, it became clear that the coefficient of friction and the wear-resistance were affected by the accelerated aging temperature.
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高橋 輝夫, 垣内 新, 佐藤 賢一
原稿種別: 本文
p.
241-242
発行日: 2003/10/17
公開日: 2017/06/19
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The recent passenger car gasoline engines have oriented for low fuel consumption and low emission due to the eco-friendly requirements. As the concrete problem to develop the eco-friendly engine, the exhaust valve seat insert is exposed to severe wear condition by friction due to the rise of combustion temperature with the progress of the lean burn. This paper is to introduce the exhaust valve seat insert which we have developed for this kind ofeco-friendly gasoline engine.
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楊 旭東, 斉藤 隆雄, 大竹 尚登, 中村 幸則, 近藤 好正
原稿種別: 本文
p.
243-244
発行日: 2003/10/17
公開日: 2017/06/19
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In order to improve wear resistance of microextrusion dies with numerous imperceptible holes, DLC film was deposited on the inner wall surface of model dies with holes of 2 mm, 0.9 mm in diameter and 20 mm in depth by using pulse plasma-enhanced CVD method. It was clearly shown that depth of the DLC film deposited on the inner wall surface of the dies was increased with the increasing of deposition pressure from 3 Pa to 10 Pa.
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沼田 俊充, 佐々木 信也
原稿種別: 本文
p.
245-246
発行日: 2003/10/17
公開日: 2017/06/19
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DLC films show the excellent tribological properties under the lubrication with humid air or water. However, lubricity of industrial oils for DLC films is not so good compared with conventional tribo-materials. It is considered that the lubricant additives don't act on the DLC surface, because of chemical stabilities of DLC. Recently, metal elements doped DLC films were developed in order to improve the adhesion property and the lubricity. In this paper, lubrication mechanism of Ti doped DLC films were discussed with the results of friction test and surface analysis. The sliding surfaces were analyzed by using the TOF-SIMS.
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太田 智仁, 橋本 富仁, 山本 康彰, 瀬戸川 晃
原稿種別: 本文
p.
247-248
発行日: 2003/10/17
公開日: 2017/06/19
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Crosslinked PTFE was made practicable by Hitachi Cable is one of good tribology materials because it has low coefficient of friction as same as PTFE (Non crosslinked) and better wear resistance that PTFE. Although tribology property of crosslinked PTFE in lubricant will become important when it is applied to movement parts of powertrain in automobiles, the study about tribology property of crosslinked PTFE in lubricant is not conducted sufficiently. So, this paper introduces tribology property of crosslinked PTFE in lubricant.
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南部 俊和, 千葉 啓貴, 加納 眞, 保田 芳輝, 牛嶋 研史, 渡辺 純
原稿種別: 本文
p.
249-250
発行日: 2003/10/17
公開日: 2017/06/19
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In a traction drive, which transmits driving force by the shear strength of a traction fluid, surface texture is thought to the an important factor affecting traction performance. In this study, the effect of surface texture was examined with the aim of improving the traction coefficient in the viscous region. Three textures-dimple, transverse and longitudinal-were examined using a 4-roller tester that enabled tests to be conducted under high pressure and high rolling speed. As a result, it was found that the longitudinal surface texture is the best for improving the traction coefficient.
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米津 明生, 平川 太陽, 小川 武史, 竹本 幹男
原稿種別: 本文
p.
251-252
発行日: 2003/10/17
公開日: 2017/06/19
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Cyclic ball indentation test was performed for polymer plastics in order to study its contact fatigue behavior. Acoustic Emission (AE) method was also employed to monitor the damage processing under the test. From the observation of indentation damage and AE analysis, it was reveled that monitored AE came from lateral cracks, which grew at subsurface area. We also evaluated the relationship between the indentation force, F, and the number of cycles to lateral crack initiation, N, Limits of force amplitude for initiating lateral cracks were examined under cyclic ball indentation test.
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谷中 雅顕, 伊橋 紀孝, 豊田 崇雄, 岡部 朋永, 武田 展雄, 清水 真佐男
原稿種別: 本文
p.
253-254
発行日: 2003/10/17
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The progress of multiple cracking and the change of electric resistance in an indium-tin-oxide (ITO) film deposited onto a polyethylene terephtalate substrate were measured simultaneously during the tensile test. The proportionality relation between the crack density and the electric resistance was obtained. The Monte Carlo simulation was conducted to predict the increase both of the crack density and the electric resistance. In the simulation, stress distributions in film fragments were properly calculated by the elastic-plastic finite element analysis. The predictions showed good agreements with experiments.
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高木 博之, 井原 郁夫, 谷中 雅顕, 小川 直美, 伊橋 紀孝, 田中 紘一
原稿種別: 本文
p.
255-256
発行日: 2003/10/17
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Nanoindentation has been applied to characterize the ultraviolet hardened layers of acryl resin coatings deposited on a polyethylene terephthalate (PET) film. The thicknesses of acryl resin and PET are 5μm and 50μm, respecetively. The hardness and elastic modulus of the hardened acryl layers were systematically examined as a function of indenter penetration depth using a standard nanoindentation method with a Berkovich diamond indenter. A significant decrease in hardness and an increase in elastic modulus have been observed at a penetration depth of less than 100 nm. In addition, the hardness in the vicinity of surface gradually decreases with the oxygen contents. It is considered that such softening in the surface layer is caused by a radical polymerization reduction due to the reaction of the radical with oxygen.
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福田 憲司, 辻 俊宏, 山中 一司
原稿種別: 本文
p.
257-258
発行日: 2003/10/17
公開日: 2017/06/19
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Recently, piezoelectric devices are used in various fields, such as memories, ultrasonic transducers and micro-actuators. Understanding of the sub micron order elastic property and domain structure for the development of piezoelectric devices is important. Ultrasonic atomic force microscopy (UAFM) can evaluate the elastic property of nm order. In this research, we improve the cantilever holder to improve the measurement accuracy of UAFM, and apply it to observation of piezoelectric materials with multi-domain structure.
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長 秀雄, 竹本 幹男
原稿種別: 本文
p.
259-260
発行日: 2003/10/17
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Study aims to monitor the AEs from the rust produced in stress corrosion cracking (SCC). AE monitoring during rust growth by salting on SCC surface of clad SUS304 and butt-weld 304 tube were attempted. AE frequency and amplitude changed significantly depending on the specimen and rust-forming environmental condition, however, AE can be used as SCC monitoring.
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羽毛田 祐一, 長 秀雄, 池田 隆二, 小川 武史, 竹本 幹男
原稿種別: 本文
p.
261-262
発行日: 2003/10/17
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ID blade of metastable austenitic stainless steel shows strong anisotropy of acoustic or elastic properties due to heavy cold drawing and fracture susceptibility due to it anisotropy. The authors estimated elastic stiffness tensors from orientation dependencies of Lamb Ao and So velocities. Velocities of Rayleigh wave decreased by 400 m/s with the angle from rolling direction while sheet velocities increased by 500 m/s. Hydrogen charged ID blade showed higher velocities than that of as-received one.
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三原 毅, 秋野 真志, 山中 一司
原稿種別: 本文
p.
263-264
発行日: 2003/10/17
公開日: 2017/06/19
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Nonlinear ultrasound in the solid is expected as the promising tool for evaluating a crack which is difficult to evaluate with the linear ultrasound. We developed a procedure to introduce closed fatigue crack and controlled a crack closure accurately using tensile load during nonlinear ultrasonic testing. Transmitted echoes through the crack were analyzed with FFT varying the applied tensile load and the amplitude of incident ultrasound. As the results, especially in the case of oblique incidence, the strong subharmonic wave found to be appeared in addition to the superharmonics. Details of the subharmonic wave behaviors due to a crack closure were investigated and the mechanism of the subharmonic wave also discussed. Amplitude of the peak frequency of the subharmonic wave found to be a tool for monitoring the crack closure.
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石川 拓人, 和田 明浩
原稿種別: 本文
p.
265-266
発行日: 2003/10/17
公開日: 2017/06/19
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Effect of crack closure on ultrasonic nondestructive testing of FRP laminates is investigated. Ultrasonic wave velocity is directly related to material stiffness. so that it is a quantitative parameter that gives information about the mechanical state of the material. However. under compressive load, stiffness recovery due to closed cracks might reduce the reliability of the inspected results. In this work, the change in the Lamb wave velocity of composite laminates is evaluated as a function of the bending load. It is confirmed that the wave velocity is enhanced by the applied load corresponding to the stiffness recovery due to closed cracks in the concave part of the laminate.
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上田 晴久, 浅川 基男, 浜田 敏雄, 京橋 永興
原稿種別: 本文
p.
267-268
発行日: 2003/10/17
公開日: 2017/06/19
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Intelligent actuators have contributed to constructing machines, robotic systems, factory automation and more. The stroke detection mechanism by using magnetic scales is small, simple and durable. But the magnetic scaling rod is made of expensive special stainless steel. Therefore the magnetic scaling rod by general carbon steel was tried experimentally. The carbon steel rod was masked by turns with copper coating, and was carborized. The coating part transformed martensite (ferromagnetic), on the other hand, non-coating part changed to retained auastenite (nonmagnetic). So the magnetic scaling rod was made using this method and the magnetic sensor detected this waveform successfully.
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世田 佳久, Dikky BURHAN, 井原 郁夫
原稿種別: 本文
p.
269-270
発行日: 2003/10/17
公開日: 2017/06/19
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In-situ measurements of molten aluminum alloy (Al-12.6%Si) using a high temperature ultrasonic sensor is presented. The developed sensor consists of a conventional piezoelectric transducer and a titanium buffer rod as a probe. A steel reflector is assembled at the probing end to provide normal incident of the ultrasonic wave impinging at the reflector surface. The sustainability of the sensor for long operation time has been investigated. Reflected signals from the steel reflector in the molten aluminum are clearly observed at 800℃. Pulse-echo measurements in the molten aluminum in temperature range from 200 to 800℃ have been performed at 5 MHz, in order to determine the longitudinal wave velocity as a function of temperature. The reflected signal characteristics as well as the velocity variation during melting and solidification of the aluminum alloy have been examined.
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松谷 延裕, Deden Dian Sukmana, 井原 郁夫
原稿種別: 本文
p.
271-272
発行日: 2003/10/17
公開日: 2017/06/19
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Surface roughness is an important parameter to evaluate surface characteristics of materials and is normally measured with the stylus-method or the optical scattering methods. This paper presents the feasibility of ultrasonic surface roughness measurement using air-coupled ultrasound. The experiment has been conducted using broadband air-coupled capacitance transducers in pitch-catch mode, that insonified samples possessing a relatively large scale of root mean square roughness Rq ranged from 0.04μm to 115μm. The good correlation between the intensity of reflected signal and the roughness Rq has been obtained.
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玉山 千雅, 村瀬 守正, 林 高弘, 川嶋 紘一郎
原稿種別: 本文
p.
273-274
発行日: 2003/10/17
公開日: 2017/06/19
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The fundamental data such as dispersion curves and wave structures are needed for applying guided wave in practical nondestructive testing for a pipe. However, there is no such a software that both dispersion curves and wave structures are given. We developed the software with LabVIEW for the preprocessor giving parameters and the postprocessor showing dispersion curves and animations of wave structure, and with Fortran for a semi-analytical FEM calculation.
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西野 秀郎, 長 秀雄, 小野 桓司, 竹本 幹男
原稿種別: 本文
p.
275-276
発行日: 2003/10/17
公開日: 2017/06/19
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Dispersion relations of the hollow cylindrical guided waves (HCGW) for different ratio of diameter to thickness of pipe are experimentally verified in comparison with the theory. Wavelet transform was employed to obtain the Time-Frequency representation. It was shown that the L (0,2) mode have a dominant role to determine the group velocity of the Primary wave of the HCGW.
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牧山 俊一, 村山 理一
原稿種別: 本文
p.
277-278
発行日: 2003/10/17
公開日: 2017/06/19
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For inspection of a storage tank and pipeline in service, the application of an automatic inspection system (nondestructive inspection robot) is desirable, because manual inspection is difficult to perfectly and exactly perform due to the enormous amount of inspection needed. However, an ultrasonic nondestructive inspection robot with a piezoelectric oscillator needs to only touch the material surface to be directly inspected using a coupling medium. That is, the material surface and the sensor must always be held by constant pressure in the vertical direction on the material side. Actually, it is difficult to overcome these problems; thus an ultrasonic inspection robot could not be widely applied. We then tried to develop an ultrasonic inspection robot with an electromagnetic acoustic transducer (EMAT) which did not require a coupling medium to inspect the circumferential pipe parts. We developed a special EMAT that could transmit and receive alternately a Lamb wave with high sensitivity and a SH plate wave without influence by the welded part. The method by which the inspection robot turned around the direction of the steel pipe surroundings was executed by observing the tape pasted in the direction of the steel pipe surroundings with an installed CCD camera. In this report, the basic mechanism of this inspection robot and an examination of results are described.
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竹本 幹男, 佐藤 由実香, 西野 秀朗, 松浦 健児, 長 秀雄
原稿種別: 本文
p.
279-280
発行日: 2003/10/17
公開日: 2017/06/19
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Study aims to detect deposition of ice inside of cooling pipe utilizing cylinder wave. Ice deposition was easily detected by a rapid decrease of F-mode amplitude, however, L-mode is much useful for quantitative monitoring of ice growth. Both the attenuation and velocities of the first arrive component of L(0,1) mode can predict the growth of ice correctly.
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石井 遊, 辻村 学, 太田 正廣
原稿種別: 本文
p.
281-282
発行日: 2003/10/17
公開日: 2017/06/19
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大松 和弘, 才木 常正, 高橋 豊, 服部 正
原稿種別: 本文
p.
283-284
発行日: 2003/10/17
公開日: 2017/06/19
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Deep X-ray Lithography (DXL), one of the microfabrication techniques using a synchrotron radiation, has been developed. To fabricate 3-D microstructures by DXL, a method was proposed that the relative position of an X-ray mask and a resist was changed. Thus, we calculated a shape of a 3-D microstructure fabricated by this method, based on deposited dose distributions on resist surface. In the calculation, we used the model in which an X-ray mask with a transmission area of a circular aperture was moving circularly during exposure. As a result, the calculated shape resembled the one fabricated by the exposure experiment.
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植田 寛康, 福田 義博, 瀧口 欣司, 池崎 洋次, 服部 正
原稿種別: 本文
p.
285-286
発行日: 2003/10/17
公開日: 2017/06/19
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The X ray mask used in the present LIGA process has the uniform thickness of an absorber. Therefore, the fabrication with flexibility in vertical-directions is very restricted. Production of the 3D microstructure, which has the arbitrary depth by such method, is difficult. In this paper, we proposed the new LIGA process using the X-ray mask absorbers with thickness variation in vertical direction. Moreover, this process is verified to give the fabrication with having flexibility in vertical-directions.
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久住 真治, 佐藤 憲昭, 銘苅 春隆, 山下 満, 嶋田 修, 服部 正
原稿種別: 本文
p.
287-288
発行日: 2003/10/17
公開日: 2017/06/19
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Utilizing warm injection molding technology, a resin core of cylindrical micro coil in diameter 0.5mm x length 1.0mm has been fabricated. Then, a coil line with 30μm width has successfully been formed by metallization. Having measuring inductance, impedance etc. on the fabricated coil, electrical characteristics as coil has been assessed. The result stated that the coil possessed characteristics worth to conventional ones. Furthermore, a new fabrication process of 3-D micro coil has been invented by composing this technology onto LIGA process.
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近藤 升孝, 米山 猛
原稿種別: 本文
p.
289-290
発行日: 2003/10/17
公開日: 2017/06/19
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A micro cutting system in the desk size which can perform cutting and 3D machining is developed. The micro hand parts have been manufactured using the system and the hand has been constructed by a micro handling system. The size of the micro hand is about 1mm across and 2mm length.
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田辺 郁, 茂木 徹一
原稿種別: 本文
p.
291-292
発行日: 2003/10/17
公開日: 2017/06/19
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In order to compare the thixoformability between granular crystal structures and dendrite crystal ones of aluminum alloy billets produced by the semisolid and conventional DC continuous casting. The thixoforming test was performed at a constant deformation speed of 4 mm/s in an argon atmosphere. The test piece consisting of granular crystals of AA356,AA6070 and AA7075 alloys reveals that the thixoforming power was less than 1kN during three quarters of forming process and the maximum power at the final stage was about 20kN. In contrast, the test piece consisting of dendrite crystal structure reveals that the power was more than 5kN at the first stage and as the forming process proceeded, the power increased. The maximum power at the last stage was about 30kN. Granular grains of primary α aluminum coexisting with the liquid phase were possible to move easily into the die cavity, because the liquid phase played an important role of lubricant as the thixoforming was performed to the semisolid slurry.
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中川 一人, 大谷 利勝, 星野 和義
原稿種別: 本文
p.
293-294
発行日: 2003/10/17
公開日: 2017/06/19
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Stirring process is widely adopted in thixo-casting, however, grain growth is observed during stirring. Therefore, heating of strained specimen at semi-solid temperature was carried out to obtain semi-solid slurry. In this method, it is expected to gain the fine and granular structure by the separation of recrystallization grain, when it is heated to semi-solid state. Al-17mass%Si alloy was used. Specimens were hot rolled or cold rolled. In hot-rolled, α -phase was observed, however, fine primary Si were not observed. In the cold-rolled specimen, it was possible to only primary Si was refining. By combining hot and cold rolling, α-phase was granulated, and then primary Si became fine.
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羽賀 俊雄, 井川 雅章, 渡利 久規
原稿種別: 本文
p.
295-296
発行日: 2003/10/17
公開日: 2017/06/19
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A twin roll caster has some advantages, for example they are energy saving, space saving, and low running cost. We tried strip casting of aluminum alloys using a vertical type twin roll caster. The twin roll caster, which has copper rolls, cast strips without using lubricant. Strips of A1050,A3004,A5083,A5182,A6063 and AC4CH could be cast at speeds higher than 60 m/min. Aluminum alloy, which freezing zone is wide like A5182,could be cast. The strips were thinner than 3mm. The strips could be cold rolled until 0.5mm without broken.
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