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辻 毅一, 古沢 琴風, 花形 剛, 安藤 柱, 佐藤 繁美
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p.
497-498
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坂元 聰介, 竹下 三四郎, 安藤 柱, 秋 旻〓, 佐藤 繁美
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p.
499-500
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姚 斐渊, 安藤 柱, 秋 旻〓, 佐藤 繁美
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p.
501-502
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花形 剛, 安藤 柱, 秋 旻〓, 辻 毅一, 古澤 琴風, 中谷 雅彦, 佐藤 繁美
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p.
503-504
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秋 旻〓, 松下 真也, 中谷 雅彦, 佐藤 繁美, 安藤 柱
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p.
505-506
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Silicon nitride containing both 8wt% yttrium oxide as a sintering additive and 20wt% silicon carbide particles (average grain size 0.03μm) was hot-press sintered. Using the material, low fatigue strength of crack-healed and proof-tested specimens (CP specimens) at elevated temperature and crack-healing behavior under both static and cyclic loading at 1200℃ in air were investigated in this study. A semi-circular pre-crack with about 110μm in diameter was introduced on the center of the tensile surface of specimens using a Vickers hardness indenter. Crack healing was performed at 1300℃ for 1 hour in air. The fatigue strength of the CP specimen decreased slightly with increasing test temperature. However, the crack-healed part is no sensitive to low cyclic fatigue below temperatures of 1400℃. The process of "crack-healing+proof test at R.T" is useful for improving the reliability for fatigue strength of Si_3N_4/SiC composite below temperatures of 1000℃. In the present material, a 110μm surface crack could be healed perfectly under both static and cyclic loading with a frequency of 0.001 to 5Hz at 1200℃ in air. Bending strength of the specimens crack-healed under loading was restored to as-received level.
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中谷 雅彦, 安藤 柱, 辻 毅一, 佐藤 繁美, 小林 康良
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p.
507-508
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Crack healing behavior and high temperature strength of Mullite/SiC composite ceramics containing Y_2O_3 have been investigated systematically. The specimens were sintered by hot-pressing at 1650℃. Semielliptical surface crack of 100μm in diameter was made on the specimens. Cracked specimens were heat-treated at 1100℃ for 3hours, or at 1300℃ for 1hour in air. Bending strength was measured by a 3-point bending test system. The bending strength of pre-cracked specimens was decreased by about 150MPa in comparison with the strength of as-received specimens. However, the bending strength level of heat-treated specimens that had cracked defects recovered completely up to that of as-received specimens. In conclusion, crack healing due to oxidation resulted in the recovery of bending strength because cracked defects were filled with oxides, which were produced by heat treatment in air. High temperature strength was dependent on the material that was produced by heat treatment.
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App10-
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加賀 靖久, 于 強, 白鳥 正樹, 大高 正稔
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p.
509-510
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廣畑 賢治, 向井 稔, 川村 法靖, 川上 崇, 于 強, 白鳥 正樹
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p.
511-512
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佐山 利彦, 高柳 毅, 森 孝男
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p.
513-514
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Thermal fatigue damage of solder joint is considered to be closely associated with microstructural phase growth. In order to relate the phase growth process to the damage quantitatively, thermal cyclic tests were carried out by using fabricated PCBs. Applying the phase growth parameter S_c which represents strain induced phase growth, to the experimental data, a new practical method is proposed for the evaluation of thermal fatigue crack initiation. The method is based on the relation ΔS_c=CN^<-β>_i, where N_i is average number of cycles to thermal fatigue crack initiation, ΔS_c is corresponding average increase in S_c per one cycle, and C and β are constants. It is very useful for the reliability of PCBs that the relation enables us to evaluate N_i by ΔS_c which is casily obtained by microstructural observation of solder joint.
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佐山 利彦, 高柳 毅, 森 孝男
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p.
515-516
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Thermal fatigue damage of solder joint is considered to be closely associated with microstructural phase growth. The authors have proposed a new method to evaluate the fatigue crack initiation life time by introducing the phase growth parameter S_c, which represents strain induced phase growth. This is an application study of the method to actual thermal cyclic tests using fabricated PCBs. As a result, microstructurally measured S_c data show Weibull's distribution. And it becomes possible to estimate the average life time with upper and lower limits corresponding to the standard deviation of observed S_c. It is very useful for the reliability of solder joint that the average life time is estimated by using shorter period data under 100 cycles.
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佐々木 克彦, 大口 健一, 柳本 陽征, 石川 博將
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p.
517-518
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大口 健一, 佐々木 克彦, 石川 博將, 柳本 陽征
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p.
519-520
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于 強, 白鳥 正樹, 坂入 慎
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p.
521-522
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酒井 秀久, 金子 正秀, 于 強, 白鳥 正樹
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p.
523-524
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于 強, 白鳥 正樹, 金 道燮
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p.
525-526
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于 強, 白鳥 正樹, 池田 真哉
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p.
527-528
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井門 修, 長竹 真美, 伊東 伸孝, 三代 絹子, 広島 義之
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p.
529-530
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田中 直敬, 三浦 英生, 角 義之
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p.
531-532
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鈴木 秀人, 中村 雅史, 松本 鉄男, 大槻 智也
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p.
533-534
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In this study, fatigue reliability of halogen free substrate noticed as an environmental harmony type printed circuit board backing was evaluated. And, the examination was demonstratively carried out on the difference of failure mechanism in fatigue breakdown and static destruction from the mesoscopic viewpoint. (1) There was a difference in both fatigue life, though mechanical property of halogen free material was almost equal to that of halogen material. That is to say, the fatigue life of halogen free material was longer than that of halogen material. (2) In halogen free material, the crack was comparatively generated in initial stage in fatigue life. In the meantime, in the halogen material, it immediately came to rupture, when crack was generated, and it was frailly destroyed. (3) From the fractographic study, it was indicated that the difference in fatigue life of halogn free material and fatigue life of halogen material was controlled by the difference of size (Unit Fracture Area) of the characteristic destruction pattern. (4) In fatigue breakdown, matrix resin is a weakest link. In the meantime, the effect of the difference of matrix resin does not appear in the static destruction in the sake glass fiber strength (that is to say, it is a strongest link).
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酒井 秀久, 白鳥 正樹, 于 強, 福田 孝, 樗 義輝, 茂木 正徳
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p.
535-536
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新川 和夫, 東藤 貢, 山田 真士, 森田 康之, 高橋 清
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p.
537-538
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杉井 弘嗣, 新谷 一人
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p.
539-540
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大林 克至, 新谷 一人
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p.
541-542
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柴田 大受, 石原 正博
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p.
543-544
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松村 隆, 峯尾 健太, 入交 俊介, 大串 浩司, 越智 保雄
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p.
545-546
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In order to clarify the effect of specimen thickness on strength degradation in ceramics, Al_2O_3 sphere impact and indentation tests were carried out on Al_2O_3+TiC specimens. The sphere were 5/32inch in diameter and the specimen thickness were 2.0,3.6 and 9.0mm. After the impact or the indentation tests, the residual strength was measured by a four-point bending test. The residual strength decreases with an increase in the impact speed or the indentation load. In the case that the cone crack was related to the final fracture, the residual strength was estimated. As a result, it was seen that the estimated values of residual strength were in approximate agreement with the experimental values.
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松村 隆, 小林 永敏, 入交 俊介, 大串 浩司, 越智 保雄
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p.
547-548
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In order to clarify the influence of impact angle on strength degradation in ceramics, tests of Al_2O_3 sphere inclination impact to Al_2O_3+TiC specimen were carried out. The residual strength of the surface damaged specimen was measured by the four-point flexural test after the impact test. As a result of the investigation into the relation between the residual strength and the normal component of impact speed, it was seen that the results of the inclination impact tests were in fair agreement with those of perpendicular impact tests. Therefore, it was clarified that normal component of impact speed was important for the residual strength of inclination impact tests.
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大下 賢一, 幡中 憲治
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p.
549-550
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木村 雄二, 寺嶋 陽一, 増田 直也
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p.
551-552
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増田 直也, 木村 雄二, 寺嶋 陽一
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p.
553-554
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Several trials have been conducted for applying Si-based ceramics as the materials used for the high temperature structure such as gas turbine components, because of there superior fracture toughness and thermal shock resistance under high temperature condition. However, various problems concerning oxidation and corrosion under high temperature environment have been reported. From among various high temperature corrosion problems. the molten salt corrosion has been pointed out as the most important one which caused serious fracture strength degradation. Purpose of this study is to evaluate the corrosion behavior and the degradation of the mechanical property of SiC and Si_3N_4 caused by molten salt.
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森 要, 内山 晃, 丸岡 邦明, 鯖戸 靖樹
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p.
555-556
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林 誠二郎, 和久 芳春
原稿種別: 本文
p.
557-558
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Fracture toughness of a unidirectionally solidified Al_2O_3/YAG eutectic composite, known as Melt Growth Composite (MGC), was measured from room temperature to 1727℃. Average fracture toughness of the material was 3.3MPam^<1/2>. No change in average fracture toughness was observed up to 1727℃. This is due to the following means : no amorphous phase formation between Al_2O_3 and YAG phase, and the effect of the eutectic composite consisting of single crystal Al_2O_3 and YAG. Observation of indentation damage in each phase by an atomic force microscope implied that microscopic properties affect crack propa gation behavior.
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大澤 裕高, 朱 世杰, 小笠原 俊夫, 石川 隆司, 越智 保雄
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p.
559-560
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The present work investigated the monotonic tension and the tensile creep behaviors of an orthogonal 3-D woven Si-Zr-C-O (Tyranno^<TM> ZMI) fiber/ Si-Ti-C-O matrix composite (CMC) in air at 1573-1723K. The tensile stress-strain curve showed transition from a linear to a nonlinear behavior at a stress of 60MPa at elevated temperatures. As results of the creep test. no apparent steady state creep was recognized. The transient creep behavior of the CMC was interpreted by a simple experimental law. Although a lot of transverse cracks in 90° fiber bundles were observed in all of the specimens. transverse cracks density did not affect considerably the transient creep rate.
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幡中 憲治, 蓮井 光彦, 趙 森
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p.
561-562
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大久保 剛, 笠野 英秋, 長谷川 脩
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p.
563-564
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姜 軍, 酒井 信介
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p.
565-566
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村岡 幹夫
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p.
567-568
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大木 順司, 幡中 憲治
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p.
569-570
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菅田 淳, 植松 美彦, 廣瀬 憲志, 城野 政弘
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p.
571-572
発行日: 2000/10/05
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In-situ observation of small fatigue crack growth in α-brass was performed by means of an atomic force microscope (AFM) equipped with a small three-point bending fatigue testing machine. The fatigue crack tip could be located exactly by measuring the variation of crack opening displacement (COD) during the load cycle. It appeared that there was the dependency of the frequent branching and deflection of the main crack on the slip deformation observed on the specimen surface.
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島本 聡, 古屋 泰文, 黒沢 信行, 阿部 博之
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p.
573-574
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江 鐘偉, 西村 浩一, 長南 征二
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p.
575-576
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This work presents a practical and quantitative technique for assessment infancy damages in a structure by measuring the impedance change of piezoelectric patches which were glued on the structure. Further, the consideration of longitudinal wave propagation in structures is introduced for the purpose to select suitable frequency regions for assessment of damage characteristics. It is shown that the damage location and the small stress change in the structure can be simply determined by measuring the PZTs electric impedance and comparing with the strain mode shape functions as a longitudinal wave propagates in the healthy structure.
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福永 久雄, 亀山 正樹, 胡 寧
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p.
577-578
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明松 圭昭, 吉田 憲一, 坂巻 清司, 堀川 敬太郎, 西川 充洋
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p.
579-580
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大槻 敦巳, 高田 仁
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p.
581-582
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河野 賢哉, 三浦 英生, 大宮 正毅, 岸本 喜久雄, 渋谷 壽一
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p.
583-584
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放生 明廣, 茶谷 明義, 立矢 宏
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p.
585-586
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Hyoungno LEE, Haruo NAKAMURA, Gen KITAMURA, Hideo KOBAYASHI
原稿種別: Article
p.
587-588
発行日: 2000/10/05
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Authors have developed a new nondestructive evaluation method of welding residual stresses called the bead flush method, and have confirmed its utility for simple welded plates by simulations and experiments. In this method, eigen-strain distributions due to welding are calculated by removing reinforeement of weld by the inverse analysis. Then residual stresses are evaluated by the forward analysis. For wider applicability and higher accuracy of this method, it is necessary to capture solution sets more accurately in the inverse analysis. Especially, characteristics of eigen-strain distributions should be clarified. Therefore in this paper, a concept how eigen-strains are utilized to capture solution sets is proposed. Based on this concept, influence factors of welding eigen-strains are examined and relations between welding eigen-strains and residual stresses are made clear by the thermo-elasto-plastic analysis.
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佐藤 雅人, 梅崎 栄作
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p.
589-590
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Stresses around vascular bundles, which were composed of metaphloems, metaxylems and protoxylems, of a bamboo stem subjected to bending were analyzed using the finite-element method and photoelastic experiments, to investigate the mechanical meaning of the geometrical arrangement of fiber bundles around vascular bundles. The bamboo stem was treated as a material having uniform mechanical properties. The results showed that the fiber bundles were arranged around stress-concentrated portions in vascular bundles.
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楠部 寛和, 久保 司郎, 村上 陽亮
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p.
591-592
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倉持 知佳夫, 千葉 矩正, 小笠原 永久
原稿種別: 本文
p.
593-594
発行日: 2000/10/05
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