journal of the Japan Society for Testing Materials最新文献_第10页

Experimental study on impermeable properties of H-jointed SPSPs with H-H joints under soil coexistence 土壤共存条件下H-H节理spsp抗渗性能试验研究

journal of the Japan Society for Testing Materials Pub Date : 2010-01-01 DOI: 10.2472/JSMS.59.74

S. Inazumi, M. Kimura, Takuzo Kuzu, T. Wakatsuki

引用次数: 1

Influence of Limestone Aggregate on Strength and Drying Shrinkage of Concrete 石灰石骨料对混凝土强度和干缩的影响

journal of the Japan Society for Testing Materials Pub Date : 2010-01-01 DOI: 10.2472/JSMS.59.769

M. Inoue, A. Carlos, H. Miura, T. Okamoto

引用次数: 2

Local Lattice Instability Analysis on Stability Switching in Amorphous Nickel 非晶镍稳定性开关的局部晶格不稳定性分析

journal of the Japan Society for Testing Materials Pub Date : 2010-01-01 DOI: 10.2472/JSMS.59.631

M. Nishimura, K. Yashiro, M. Arai

{"title":"Local Lattice Instability Analysis on Stability Switching in Amorphous Nickel","authors":"M. Nishimura, K. Yashiro, M. Arai","doi":"10.2472/JSMS.59.631","DOIUrl":"https://doi.org/10.2472/JSMS.59.631","url":null,"abstract":"We have so far shown that amorphous metals have many “unstable” atoms even at the equilibrium state, by local lattice instability analysis (LLIA) which discusses the positive definiteness of atomic elastic stiffness coefficients, Bαij. In the present study, we put our focus on the stability switching by the “probabilistic” fluctuation and the “deterministic” mechanical load. We have performed molecular dynamics simulations on Ni amorphous and evaluated the stability switching under no-load equilibrium as well as uniaxial tension. It is definitely true that the ratio of unstable atoms decreases/increases according to the system energy ; however, it is revealed that one-way change of stabilization or destabilization never occur but both positive and negative stability-switching are activated from their ratio under the equilibrium state. That is, a straightforward image of “stabilization/destabilization of local configuration” is not correct for structural change in amorphous metal but “shuffle of atomic arrangement” which involves atomic stabilization and destabilization simultaneously. In fact, we have proved that (1) both switching drastically increase at the slow-down point just before the stress-strain peak, (2) many stabilization/destabilization atoms can be found in the locally deformed area, and (3) such switching atoms actually feel hydrostatic tension in the dilated local configuration on the way of “shuffle”.","PeriodicalId":17366,"journal":{"name":"journal of the Japan Society for Testing Materials","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2010-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79637151","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: 2

Deformation-Induced Electronic Structure Changes in Boron Nitride Nanotubes 变形诱导的氮化硼纳米管电子结构变化

journal of the Japan Society for Testing Materials Pub Date : 2010-01-01 DOI: 10.2472/JSMS.59.604

Y. Kinoshita, N. Ohno

引用次数: 1

Mod.9Cr-1Mo鋼溶接継手のクリープ損傷挙動 Mod. 9cr - 1mo钢焊接接头的蠕形损伤行为

journal of the Japan Society for Testing Materials Pub Date : 2009-02-15 DOI: 10.2472/JSMS.58.101

宏通本郷, 正明田淵, 永奎李, 高橋由紀夫

引用次数: 9

Fatigue Crack Propagation of P/M Soft Magnetic Materials with a High-Resistance Surface Layer 高阻表层P/M软磁材料的疲劳裂纹扩展

journal of the Japan Society for Testing Materials Pub Date : 2009-01-01 DOI: 10.2472/JSMS.58.853

R. Tanegashima, T. Shirosaka, H. Akebono, Masahiko Kato, A. Sugeta, K. Minoshima

{"title":"Fatigue Crack Propagation of P/M Soft Magnetic Materials with a High-Resistance Surface Layer","authors":"R. Tanegashima, T. Shirosaka, H. Akebono, Masahiko Kato, A. Sugeta, K. Minoshima","doi":"10.2472/JSMS.58.853","DOIUrl":"https://doi.org/10.2472/JSMS.58.853","url":null,"abstract":"In this study, fatigue properties of PM (Powder Metallurgy) soft magnetic materials were investigated by observation of the small fatigue crack propagation. The materials to which binder resin were added (Material BA) and three kinds of materials with different density (Material LD, MD and HD) were used in this study. Reversed plane bending fatigue tests were conducted at room temperature and small fatigue crack growths were studied in detail by means of replication technique. The fatigue strength became higher in the order, material HD, MD, LD, BA. In all specimens, cracks initiated at multi sites and each crack propagated with frequent deflection. Furthermore, cracks were coalesced repeatedly and specimen reached final fracture. Moreover, the difference between the materials was not recognized clearly in the da/dN-Kmax relationship. The maximum defect size, √area max, which was estimated by the statistics of extreme value became higher in the order, material BA, LD, MD, HD. As a result, the addition of the binder resin to PM alloy was not effective in improvement of fatigue strength. Furthermore, densification by increasing compacting pressure was effective in improvement of fatigue strength because the maximum defect size in each material became smaller. The ΔK0-Nf/√area max was estimated to consider whether the evaluation by the statistics of extreme value had propriety to the fatigue strength. Then, their curves were not corresponded. The disagreement was originated in the difference of coalescence frequency until the specimen reached to final fracture.","PeriodicalId":17366,"journal":{"name":"journal of the Japan Society for Testing Materials","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2009-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86817486","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: 1

Measurement of Residual Stress Distribution in Sputtered Cu Thin Films by X-Ray Method 用x射线法测量溅射Cu薄膜残余应力分布

journal of the Japan Society for Testing Materials Pub Date : 2009-01-01 DOI: 10.2472/JSMS.58.575

Y. Akiniwa, H. Kimura, Takuhisa Sakaue

{"title":"Measurement of Residual Stress Distribution in Sputtered Cu Thin Films by X-Ray Method","authors":"Y. Akiniwa, H. Kimura, Takuhisa Sakaue","doi":"10.2472/JSMS.58.575","DOIUrl":"https://doi.org/10.2472/JSMS.58.575","url":null,"abstract":"Three kinds of copper thin films were fabricated by RF-magnetron sputtering. The target power was selected to be 10 and 150W to change the properties of the films. Thin glass sheet was used as a substrate. For the target power of 150W, the deposition time was selected to be 7 and 40min. The thickness was 0.6μm and 2.9μm, and the grain size measured was 243nm and 450nm, respectively. The grain size of thicker film was larger than that of thinner one. On the other hand, for the target power of 10W, the thickness and grain size were 2.4μm and 54nm, respectively. The grain size depends on the target power, too. The residual stress distribution in the films was measured by X-ray method. Several methods such as the grazing incidence X-ray diffraction method, the constant penetration depth method and the conventional sin2ψ method were adopted. The measured weighted average stress increased with increasing depth. After taking the maximum value at about 0.3μm from the surface, the value decreased with increasing depth. The stress distribution near the surface in the films deposited at 150W was almost identical irrespective of thickness. On the other hand, for the target power of 10W, the stress distribution shifted to compression side. The reason could be explained by the effect of the thermal residual stress. The real stress distribution was estimated by using the optimization technique. The stress took the maximum value at 0.5μm from the surface, and was compressive near the substrate.","PeriodicalId":17366,"journal":{"name":"journal of the Japan Society for Testing Materials","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2009-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80278427","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

Effects of Heating at Lower Temperature on Water Adsorption Behavior for Wood 低温加热对木材吸水性能的影响

journal of the Japan Society for Testing Materials Pub Date : 2009-01-01 DOI: 10.2472/JSMS.58.175

M. Shiga, T. Nakano

引用次数: 3

Creep Rupture Behavior of Modified 9Cr-1Mo Steel under Multiaxial Stress and Its Modeling 改性9Cr-1Mo钢在多轴应力下的蠕变断裂行为及其建模

journal of the Japan Society for Testing Materials Pub Date : 2009-01-01 DOI: 10.2472/JSMS.58.115

Yukio Takahashi

{"title":"Creep Rupture Behavior of Modified 9Cr-1Mo Steel under Multiaxial Stress and Its Modeling","authors":"Yukio Takahashi","doi":"10.2472/JSMS.58.115","DOIUrl":"https://doi.org/10.2472/JSMS.58.115","url":null,"abstract":"1 緒言発電プラントなどに使用される高温機器の健全性を確保する上でクリープ変形やこれによる破壊を精度良く予測することが必須であるが,複雑な形状や負荷によって, 実機中の材料には様々な多軸応力状態が生じるため,クリープ変形や破壊に対する応力多軸性の影響に関して多くの研究が実施されてきている.良く知られている代表的なものとしては,ボイドの成長に対する理論的検討に基づいた多軸延性モデル 1), 2)や実験結果に基づいた相当応力の式 3), 4)などがあり,一部の設計基準や健全性評価ガイドでも採用されている 5), 6)が,単軸引張状態に比較して試験が困難な上に試験条件のパラメータが増えるなどの理由で系統的なデータ取得が難しく,各種材料に対するこれらの妥当性の確認は十分に行われていない.さらに,対象を一材料に固定したとしても,温度,応力, 多軸度などの幅広い範囲にわたって多軸性の影響が検討された例は見当たらない. ここでは,近年の火力発電プラントに多用されており, 高速炉等の原子力発電プラントでの使用も検討されている代表的な高温構造材料で,高精度評価法に対する要求が強い改良 9Cr-1Mo鋼を対象に,多軸クリープ試験として多くの実績がある 7)環状切欠き付き丸棒試験片に対するクリープ試験を行い,クリープ破断挙動に及ぼす温度, 応力の影響を調査した.さらに,別途実施された CT試験片によるき裂進展試験 8)に対する数値シミュレーションの結果と合わせて,クリープ破断延性に及ぼす応力多軸性の影響を幅広く検討し,そのモデル化を試みた.最後に切欠き材と CT試験片に対して,このモデルを組み込んだ数値シミュレーションを実施し,多軸状態でのクリープ変形・破壊に対する数値シミュレーションの方法の有効性を総合的に検討した.以下これらの結果を報告する. 2 切欠き付き丸棒クリープ試験 2・1 試験材料および試験方法試験には前報 9)と同様,板厚 50mmの改良 9Cr-1Mo 鋼平板を用いた.本材料の化学成分を Table 1に示す. 本材料については,すでに多数の単軸引張クリープ試験が行われているが,本研究では Fig. 1に示す環状切欠き付き丸棒試験片に対する一定荷重引張クリープ試験を 550°C,600°C,650°Cの 3温度で数本ずつ実施した.なお,本試験片において同一形状の切欠きが直列に 2個加工されているのは,一方が破断した後,他方の損傷状態を観察できるようにするためである.切欠き部の最終表面仕上げは 800番のエミリー紙によった. 2・2 試験結果切欠き材に対して得られた破断寿命を切欠き断面の平均応力 σnet(荷重を切欠き部の最小断面積で除した値) の関数としてプロットした結果を Fig. 2に示す.同図には平滑試験片に対する試験結果を合わせて示すが,これより,いずれの温度でも同一の実断面応力では切欠き材改良 9Cr-1Mo鋼の多軸応力下でのクリープ破壊挙動とそのモデル化高橋由紀夫 Creep Rupture Behavior of Modified 9Cr-1Mo Steel under Multiaxial Stress and Its Modeling","PeriodicalId":17366,"journal":{"name":"journal of the Japan Society for Testing Materials","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2009-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74311023","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: 13

Effect of Humidity on Fatigue Strength of Notched Age-Hardened Al Alloy 湿度对缺口时效硬化铝合金疲劳强度的影响

journal of the Japan Society for Testing Materials Pub Date : 2009-01-01 DOI: 10.2472/JSMS.58.860

N. Kawagoishi, T. Kanemaru, K. Kariya, Y. Ohzono

引用次数: 0