journal of the Japan Society for Testing Materials最新文献_第9页

Simplified Method for Estimation of Fatigue Life on High-Strength Aluminum Alloy under Two-Step Loading 两步加载下高强铝合金疲劳寿命估算的简化方法

journal of the Japan Society for Testing Materials Pub Date : 2011-01-01 DOI: 10.2472/JSMS.60.1110

T. Takase, Atsuhiro Koyama

{"title":"Simplified Method for Estimation of Fatigue Life on High-Strength Aluminum Alloy under Two-Step Loading","authors":"T. Takase, Atsuhiro Koyama","doi":"10.2472/JSMS.60.1110","DOIUrl":"https://doi.org/10.2472/JSMS.60.1110","url":null,"abstract":"A simplified method for estimating the fatigue limit and the fatigue life under two-step loading for the stress ratio R = 0 based on the results for R = -1 was proposed. This method required the fatigue test under constant amplitude loading and two-step loading for R = -1. In this paper, fatigue tests were carried out using high-strength aluminum alloy. In two-step loading for R = -1, two stress amplitude 1eve1s were used as the primary stress amp1itude and three cycle ratios were combined. The cycle ratio was defined as the ratio of cycles at the primary stress amplitude to the corresponding fatigue life. The fatigue limit and the fatigue life under the secondary stress amplitude tended to lower, as the cycle ratio under the primary stress amplitude increased. This tendency did not depend on the magnitude of the primary stress amplitude and the results were approximated with the same line. Hence, the method that had proposed for carbon steel under two-step loading could be applied to high-strength aluminum alloy. Then, the results of fatigue test for R = 0 were discussed using the equivalent stress amplitude, which was estimated by considering the stress amplitude and the mean stress. Under constant amplitude loading, the results for R = 0 approached to R = -1 by using the equivalent stress amplitude. For R = 0, the fatigue limits under two-step loading estimated by the simplified method were lower than the experimental ones, whereas the estimated fatigue life was in good agreement with the experimental results.","PeriodicalId":17366,"journal":{"name":"journal of the Japan Society for Testing Materials","volume":"52 1","pages":"1110-1115"},"PeriodicalIF":0.0,"publicationDate":"2011-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85305083","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

CF／エポキシ複合材料の亜臨界水・超臨界メタノール処理から得られる回収炭素繊維の引張強度 CF /环氧复合材料的亚临界水、超临界甲醇处理得到的回收碳纤维的抗拉强度

journal of the Japan Society for Testing Materials Pub Date : 2010-12-15 DOI: 10.2472/JSMS.59.964

敏郎上田, 佳伸島村, 東郷敬一郎, 朋之藤井, 岡島いづみ, 正敬平松, 猛佐古

引用次数: 4

Fabrication by Mist CVD Method and Evaluation of Corundum Structured Oxide Semiconductor Thin Films 薄雾CVD法制备刚玉结构氧化物半导体薄膜及评价

journal of the Japan Society for Testing Materials Pub Date : 2010-01-01 DOI: 10.2472/JSMS.59.686

K. Kaneko, Taichi Nomura, Y. Fukui, S. Fujita

{"title":"Fabrication by Mist CVD Method and Evaluation of Corundum Structured Oxide Semiconductor Thin Films","authors":"K. Kaneko, Taichi Nomura, Y. Fukui, S. Fujita","doi":"10.2472/JSMS.59.686","DOIUrl":"https://doi.org/10.2472/JSMS.59.686","url":null,"abstract":"We propose a novel corundum-structured oxide semiconductor alloy system of α-(Ga2O3)-(Fe2O3)-(Cr2O3) thin films as a potential material with multifunctional properties contributing to future unique devices. In this paper the focus is given on the detailed characterization of α-Fe2O3 thin films grown on c-plane sapphire substrates. α-Fe2O3 is an oxide semiconductor with the optical band gap of 2.2eV, exhibiting a weak ferromagnetic property, and is alloyed with α-Ga2O3 to develop promising potentials toward spintronic applications. The growth has been carried out by the mist chemical vapor deposition (CVD) method which has been developed by our group. In the experiment, we used water solution of iron acetylacetonate [(C5H8O2)3Fe] as a Fe source and air as carrier gas. The growth temperature was set at 500°C. X-ray diffraction measurements revealed the successful formation of corundum-structured α-Fe2O3 thin films. The full-width at half maximum of X-ray diffraction rocking curve was as small as 41arcsec. In-plane pole figure measurements indicated that α-Fe2O3 thin films were epitaxially grown on the substrate, but that rotational domains were contained with the volume ratio of about 0.7%. The atomic force microscope surface image showed many grains and the root mean square roughness was 1.26nm. These results showed the successful fabrication of highly-crystalline epitaxial α-Fe2O3 thin films on c-plane sapphire substrates, though further efforts to improve the surface morphology were suggested.","PeriodicalId":17366,"journal":{"name":"journal of the Japan Society for Testing Materials","volume":"29 1","pages":"686-689"},"PeriodicalIF":0.0,"publicationDate":"2010-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90923333","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

Cure Monitoring of Resin by Real-Time Measurement of Refractive Index Using Single-Mode Optical Fibers 基于单模光纤折射率实时测量的树脂固化监测

journal of the Japan Society for Testing Materials Pub Date : 2010-01-01 DOI: 10.2472/JSMS.59.391

T. Kosaka, K. Osaka, Y. Sawada

{"title":"Cure Monitoring of Resin by Real-Time Measurement of Refractive Index Using Single-Mode Optical Fibers","authors":"T. Kosaka, K. Osaka, Y. Sawada","doi":"10.2472/JSMS.59.391","DOIUrl":"https://doi.org/10.2472/JSMS.59.391","url":null,"abstract":"This study proposes a real-time monitoring method for degree of cure (DOC) of curing resin by refractive index measurement using a single-mode optical fiber based on the Fresnel reflection at the fiber end. First, we particularly present an approach for measuring refractive index of resin in real time without the effects of unexpected backward reflection. We applied this approach to measurement of refractive index of an epoxy resin during cure process, and experimentally confirmed that the change of the refractive index was stably measured in real time. Next, we proposes a new approach to calculate DOC from change of refractive index by eliminating effect of temperature change on refractive index of curing resin. This approach can quantitatively evaluate the DOC in real time, which is not obtained by conventional methods, and provide information in the small region at the fiber end. The experimental results of monitoring cure process of the epoxy resin showed that the DOC could be stably measured by this approach without effect of the temperature change. Furthermore, the DOC obtained by this approach was compared with the DOC curve by the thermal analysis using differential scanning calorimeter. These experiments revealed that the DOC by the present approach represented the curing condition of the resin regardless of the cure pattern and was easily translated into the DOC by the thermal analysis. The present approach of real-time quantitative evaluation of the DOC can be applied to fast cure reaction as well as slow reaction demonstrated in this paper.","PeriodicalId":17366,"journal":{"name":"journal of the Japan Society for Testing Materials","volume":"24 1","pages":"391-397"},"PeriodicalIF":0.0,"publicationDate":"2010-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86377533","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 9

Study of Temperature Dependence of Island Formation and Structure of Gallium Nitride in MBE Growth MBE生长中氮化镓岛状结构与温度的关系研究

journal of the Japan Society for Testing Materials Pub Date : 2010-01-01 DOI: 10.2472/JSMS.59.157

Yasunori Kobayashi, Y. Doi, A. Nakatani

引用次数: 0

Effect of Mixing Time and Mix Proportion on Properties of High Fly-Ash Paste 掺合时间和掺合比例对高粉煤灰膏体性能的影响

journal of the Japan Society for Testing Materials Pub Date : 2010-01-01 DOI: 10.2472/jsms.59.751

M. Sakamoto, K. Takewaka, Toshinobu Yamaguchi

引用次数: 0

Effect of Strain Rate on Tensile and Compressive Plastic Deformation of Zr70Ni16Cu6Al8 Bulk Metallic Glass 应变速率对Zr70Ni16Cu6Al8大块金属玻璃拉伸和压缩塑性变形的影响

journal of the Japan Society for Testing Materials Pub Date : 2010-01-01 DOI: 10.2472/JSMS.59.118

Akinori Shirota, Hitoo Tokunaga, K. Fujita, Y. Yokoyama, T. Yamasaki, A. Inoue

{"title":"Effect of Strain Rate on Tensile and Compressive Plastic Deformation of Zr70Ni16Cu6Al8 Bulk Metallic Glass","authors":"Akinori Shirota, Hitoo Tokunaga, K. Fujita, Y. Yokoyama, T. Yamasaki, A. Inoue","doi":"10.2472/JSMS.59.118","DOIUrl":"https://doi.org/10.2472/JSMS.59.118","url":null,"abstract":"1 緒言バルク金属ガラス (BMG) は高強度,高じん性,高耐食性を有し,また曲げ 1)や圧縮 2), 3)負荷の下で大きな塑性変形を示すものも開発されており,機械・構造部材として注目されている.しかし,引張負荷の下ではほとんどの BMGは塑性変形を示さず,脆性的に破壊するため信頼性に欠けると見られ,このことが BMGの機械・構造部材への実用化の妨げとなっている.引張塑性変形が生じない原因として,BMGの変形は転位によるすべりではなく,せん断帯の発生・伝ぱによっており,このせん断帯内部においては弾性ひずみエネルギーの解放による急速な局所発熱 4)で BMGが過冷却液体あるいは溶融状態となり,その粘度が著しく低下して不安定破壊を生じることが挙げられる.これまでに報告されている BMG の引張塑性変形のほとんどは BMGをマトリックスとする複合材料 5)~ 7)に関するものであり,単相 BMGの引張塑性変形に関する報告例は極めて少ない.8), 9)例えば A.V. Sergueevaら 8)はひずみ速度が速い (5.0 × 10−2 s−1) 場合に Zr41.2Ti13.8Cu12.5Ni10Be22.5 BMGにおいて破面に平行な複数のせん断帯の形成により,引張塑性変形が発現することを報告している.また,最近我々のグループは低ヤング率,高ポアソン比を示す亜共晶 Zr-Ni-Cu-Al BMG を用いて,ひずみ速度が速い (1.6 × 10−1 s−1) 場合に明確な引張塑性変形が発現することを報告した.10)一方,ひずみ速度が BMGの塑性変形挙動やせん断帯の形成に及ぼす影響についてはこれまでに多くの関心が寄せられており,引張 11)~ 14)・圧縮試験 13)~ 15)やナノインデンテーション試験 16), 17)など様々な手法によって検討されている. 例えば J. Zhangら 15)は Ti45Zr16Ni9Cu10Be20 BMGに対してひずみ速度を変化させた圧縮試験を行い,ひずみ速度が遅いほど多数のせん断帯が形成され,塑性変形量が増大することを報告している.また,T. Mukaiら 12), 13)は Pd40Ni40P20 BMGに対してひずみ速度を変化させた引張・圧縮試験を行い,引張ではいずれのひずみ速度下でも塑性変形は生じず,圧縮ではひずみ速度が遅いほど塑性変形量が増大することを報告している.これらの結果は BMGの塑性変形やせん断帯の形成がひずみ速度に強く依存することを示唆している. Zr70Ni16Cu6Al8バルク金属ガラスの引張・圧縮塑性変形に及ぼすひずみ速度の影響城田明典永仁夫藤田和孝横山嘉彦山崎徹井上明久 Effect of Strain Rate on Tensile and Compressive Plastic Deformation of Zr70Ni16Cu6Al8 Bulk Metallic Glass","PeriodicalId":17366,"journal":{"name":"journal of the Japan Society for Testing Materials","volume":"1 1","pages":"118-123"},"PeriodicalIF":0.0,"publicationDate":"2010-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85468395","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

Growth Temperature Dependence of Eu-Doped GaN Grown by Organometallic Vapor Phase Epitaxy 有机金属气相外延生长铕掺杂GaN的生长温度依赖性

journal of the Japan Society for Testing Materials Pub Date : 2010-01-01 DOI: 10.2472/JSMS.59.671

A. Nishikawa, T. Kawasaki, N. Furukawa, Y. Terai, Y. Fujiwara

引用次数: 0

Repairing Material for Embankment Using a Bottom Sludge of Age-Old Reservoir 利用老水库底泥修补路堤材料

journal of the Japan Society for Testing Materials Pub Date : 2010-01-01 DOI: 10.2472/JSMS.59.50

Kenichi Sato, T. Fujikawa, Hiroyuki Tanaka, S. Yokota

{"title":"Repairing Material for Embankment Using a Bottom Sludge of Age-Old Reservoir","authors":"Kenichi Sato, T. Fujikawa, Hiroyuki Tanaka, S. Yokota","doi":"10.2472/JSMS.59.50","DOIUrl":"https://doi.org/10.2472/JSMS.59.50","url":null,"abstract":"1 はじめにため池とは,主に農業用水を確保するために水を貯え取水設備を備えた人工池のことを指し,我が国には全国で約 21万箇所ものため池が存在する. このため池の約 70%以上は,築後 100年以上経過しており,老朽化に伴う貯水量の減少,水質悪化,堤体の崩壊,底泥の堆積といった問題が発生しているため,ため池の整備が急務である.特にため池に堆積する底泥は, 捨土処分費が高価であることや処分場の場所の確保が難しくなってきたことから,ため池内で有効利用することが好ましいと考えられている.そのような背景を踏まえ, 福島ら 1)~ 3)は,原位置における底泥のセメント改良を行い,養生後に掘削・運搬・解きほぐしを行った後,ため池の改良材(遮水材)として利用する研究を行っている. また,鍋島ら 4)は,ため池底泥にシュレッダーペーパーを混合した堤体のせん断特性について研究を行っている. そのような中,本研究では,ため池内で底泥をセメント固化処理した後に掘削し,その掘削土を堤体の改良材として利用することを目的としている.しかしながら,一般的にため池底泥は高含水比であるため,有効利用するためには多量な固化材を必要とする.そこで,本研究では底泥の含水比を効果的に低下させ,固化材の添加量を縮減させる助材に着目し検討を行った.今回の報告では (1) 固化材の選定,(2) 助材(石膏粉,PS灰と竹パウダー)による固化材の低減効率の検討を行った結果について報告する. 2 実験概要 2・1 実験試料本研究ではため池底泥として,山口県山口市の出合いための助材としては,建築廃材の石膏ボードを焼成し, 2mm以下に粉砕した半水石膏(以下,石膏粉)と PS (ペパースラッジ)灰と竹をパウダー状にした竹パウダーを用いた.固化材には高炉セメント B種またはセメント系固化材を用いた.高炉セメントは,スラグの潜在水硬性により長期的な強度増加が期待でき,Cr6+溶出を普通ポルトランドセメントよりも抑制することが可能である. また,セメント系固化材は,高有機質土に含まれるフミン酸やフルボン酸等の有害成分が水和反応を阻害することを抑える効果を有している.Fig. 1および Table 1に底泥,石膏粉,PS灰と竹パウダーの粒径加積曲線と物理特性を示す.底泥はw = 179%,Fc = 65%,Ig-loss = 10%と非常に高含水比かつ高有機質であり,細粒分を多く含む土質材料である. ため池底泥を用いた堤体補修材料の基礎的研究佐藤研一藤川拓朗田中浩之横田季彦 Repairing Material for Embankment Using a Bottom Sludge of Age-Old Reservoir","PeriodicalId":17366,"journal":{"name":"journal of the Japan Society for Testing Materials","volume":"1 1","pages":"50-55"},"PeriodicalIF":0.0,"publicationDate":"2010-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83180804","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Effects of Fiber Directions on Strengths of Notched Specimens of C/C Composite:English version of the paper published in "Journal of the Society of Materials Science, Japan, 59 (12) : 970-976 (2010)" 纤维方向对C/C复合材料缺口试样强度的影响，发表于《材料科学学报》，59 (12):970-976 (2010)

journal of the Japan Society for Testing Materials Pub Date : 2010-01-01 DOI: 10.2472/JSMS.61.973

Tsuyoshi Tohkubo, M. Fujikawa, C. Makabe, S. A. Setyabudi, A. Murdani

引用次数: 3