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The Effect of PVA Addition on the Microstructure of the Porous Zirconia Ceramic by Unidirectional Freeze Casting PVA添加量对单向冷冻铸造多孔氧化锆陶瓷组织的影响
journal of the Japan Society for Testing Materials Pub Date : 2014-01-01 DOI: 10.2472/JSMS.63.437
Koichi Itoi, H. Shiomi
{"title":"The Effect of PVA Addition on the Microstructure of the Porous Zirconia Ceramic by Unidirectional Freeze Casting","authors":"Koichi Itoi, H. Shiomi","doi":"10.2472/JSMS.63.437","DOIUrl":"https://doi.org/10.2472/JSMS.63.437","url":null,"abstract":"Porous ZrO 2 ceramic was prepared by a unidirectional freeze casting using aqueous slurries containing PVA. The effects of PVA content on the microstructure of sintered bodies were investigated by a scanning electron microscopy and a mercury intrusion porosimetry. Porous ZrO 2 ceramic with continuously long-ranged pore structure was obtained by the unidirectional freeze casting of the aqueous ZrO 2 slurry, followed by sublimation of ice and firing at 1400 ℃ for 1h in air. The PVA loading of the slurry scarcely affected the pore volume of sintered bodies. However, the pore size decreased and the compressive strength increased with increasing PVA loading in the slurry. When PVA was added, branch and ladder structures occurred in pore walls. Therefore, three dimensional pore structures developed due to the increased in the connectivities of the pore walls, resulting in the decrease in pore size and the increase in compressive strength.","PeriodicalId":17366,"journal":{"name":"journal of the Japan Society for Testing Materials","volume":"171 1","pages":"437-441"},"PeriodicalIF":0.0,"publicationDate":"2014-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77775460","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
Experimental Method for Dynamic Compression Behavior of Composite Laminates Using SHPB Technique 基于SHPB技术的复合材料层合板动态压缩性能试验方法
journal of the Japan Society for Testing Materials Pub Date : 2014-01-01 DOI: 10.2472/JSMS.63.362
T. Kusaka, Takanori Kono, Y. Nomura, Hiroki Wakabayashi
{"title":"Experimental Method for Dynamic Compression Behavior of Composite Laminates Using SHPB Technique","authors":"T. Kusaka, Takanori Kono, Y. Nomura, Hiroki Wakabayashi","doi":"10.2472/JSMS.63.362","DOIUrl":"https://doi.org/10.2472/JSMS.63.362","url":null,"abstract":"A novel experimental method was proposed for characterizing the compressive properties of composite materials under impact loading. Split Hopkinson pressure bar system was employed to carry out the dynamic compression tests. The dynamic stress-strain relations could be precisely estimated by the proposed method, where the ramped input, generated by the plastic deformation of a zinc buffer, was effective to reduce the oscillation of the stress field in the specimen. The longitudinal strain of gage area could be estimated from the nominal deformation of gage area, and consequently the failure process could be grasped in detail from the stress-strain relation. Finite element analysis was also carried out to confirm the validity of the proposed method. Numerical results demonstrated that the nonuniformity of the stress field could be negligible by using the ramped input. The dynamic compressive strength of a twilled-woven carbon-fiber/epoxy composite was slightly higher than the static compressive strength.","PeriodicalId":17366,"journal":{"name":"journal of the Japan Society for Testing Materials","volume":"18 11","pages":"362-367"},"PeriodicalIF":0.0,"publicationDate":"2014-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91528936","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
Relationship between Strength and Process Parameters in Friction Stir Spot Welded PVC Joint Fabricated Composite Material at Welded Region 焊接区搅拌摩擦点焊PVC接头复合材料强度与工艺参数的关系
journal of the Japan Society for Testing Materials Pub Date : 2014-01-01 DOI: 10.2472/JSMS.63.837
Yohei Kurabe, Y. Miyashita, H. Hori
{"title":"Relationship between Strength and Process Parameters in Friction Stir Spot Welded PVC Joint Fabricated Composite Material at Welded Region","authors":"Yohei Kurabe, Y. Miyashita, H. Hori","doi":"10.2472/JSMS.63.837","DOIUrl":"https://doi.org/10.2472/JSMS.63.837","url":null,"abstract":"","PeriodicalId":17366,"journal":{"name":"journal of the Japan Society for Testing Materials","volume":"43 1","pages":"837-843"},"PeriodicalIF":0.0,"publicationDate":"2014-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77592254","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
Stress Waveform Effect on Low-Cycle Fatigue Life for SUS316FR Round Notched Bar and the Life Prediction 应力波形对SUS316FR圆缺口棒低周疲劳寿命的影响及寿命预测
journal of the Japan Society for Testing Materials Pub Date : 2014-01-01 DOI: 10.2472/JSMS.63.647
N. Hamada, M. Sakane, K. Motoie, H. Umeda
{"title":"Stress Waveform Effect on Low-Cycle Fatigue Life for SUS316FR Round Notched Bar and the Life Prediction","authors":"N. Hamada, M. Sakane, K. Motoie, H. Umeda","doi":"10.2472/JSMS.63.647","DOIUrl":"https://doi.org/10.2472/JSMS.63.647","url":null,"abstract":"This paper studies the stress waveform effect on low cycle fatigue life for three kinds of notched specimens at elevated temperature. Low cycle fatigue tests were carried out using circumferential notched specimens of SUS316FR stainless steel using fast-fast, slow-fast and hold-time stress waveforms at 923K. Neuber’s rule recommended in ASME Code Case was applied to estimate failure and crack initiation lives. Failure lives were underestimated by Neuber’s rule in ASME Code Case NH. Crack initiation lives under the fast-fast, slow-fast and hold-time stress waveforms were correlated within a factor of 4 scatter band by using modified Neuber’s equation in which the exponent of K t was changed from 2 to 1.2 in the combination with frequency modified fatigue life equation.","PeriodicalId":17366,"journal":{"name":"journal of the Japan Society for Testing Materials","volume":"117 1","pages":"647-654"},"PeriodicalIF":0.0,"publicationDate":"2014-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86811102","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
高温環境下におけるSiN x /SiC y ナノ積層薄膜の自己き裂治癒挙動 高温环境下SiN x /SiC y纳米叠层薄膜的自撕裂愈合行为
journal of the Japan Society for Testing Materials Pub Date : 2013-10-15 DOI: 10.2472/JSMS.62.634
正憲 中谷, 淳樹 西村, 聡 花木, 仁 内田
{"title":"高温環境下におけるSiN x /SiC y ナノ積層薄膜の自己き裂治癒挙動","authors":"正憲 中谷, 淳樹 西村, 聡 花木, 仁 内田","doi":"10.2472/JSMS.62.634","DOIUrl":"https://doi.org/10.2472/JSMS.62.634","url":null,"abstract":"","PeriodicalId":17366,"journal":{"name":"journal of the Japan Society for Testing Materials","volume":"62 1","pages":"634-639"},"PeriodicalIF":0.0,"publicationDate":"2013-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75190401","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
第12回コンクリート構造物の補修，補強，アップグレードシンポジウム 第12届混凝土结构维修、加固、升级研讨会
journal of the Japan Society for Testing Materials Pub Date : 2013-03-15 DOI: 10.2472/JSMS.62.231
貴士 山本
{"title":"第12回コンクリート構造物の補修，補強，アップグレードシンポジウム","authors":"貴士 山本","doi":"10.2472/JSMS.62.231","DOIUrl":"https://doi.org/10.2472/JSMS.62.231","url":null,"abstract":"","PeriodicalId":17366,"journal":{"name":"journal of the Japan Society for Testing Materials","volume":"20 1","pages":"231"},"PeriodicalIF":0.0,"publicationDate":"2013-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82684454","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
Cr-Mo-V鋼のクリープ中の非線形音響特性の変化と微細組織の関係 Cr-Mo-V钢蠕变中非线性声学特性的变化与微细组织的关系
journal of the Japan Society for Testing Materials Pub Date : 2013-02-15 DOI: 10.2472/JSMS.62.60
俊博 大谷, 祐紀 草なぎ, 優 石井
{"title":"Cr-Mo-V鋼のクリープ中の非線形音響特性の変化と微細組織の関係","authors":"俊博 大谷, 祐紀 草なぎ, 優 石井","doi":"10.2472/JSMS.62.60","DOIUrl":"https://doi.org/10.2472/JSMS.62.60","url":null,"abstract":"","PeriodicalId":17366,"journal":{"name":"journal of the Japan Society for Testing Materials","volume":"36 1","pages":"60-67"},"PeriodicalIF":0.0,"publicationDate":"2013-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81377182","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
Evaluation of Deformation Behavior in Amorphous Metals by Atomic Elastic Stiffness Coefficients 用原子弹性刚度系数评价非晶金属的变形行为
journal of the Japan Society for Testing Materials Pub Date : 2013-01-01 DOI: 10.2472/JSMS.62.179
M. Nishimura, Y. Iwasaki, M. Arai
{"title":"Evaluation of Deformation Behavior in Amorphous Metals by Atomic Elastic Stiffness Coefficients","authors":"M. Nishimura, Y. Iwasaki, M. Arai","doi":"10.2472/JSMS.62.179","DOIUrl":"https://doi.org/10.2472/JSMS.62.179","url":null,"abstract":"1 緒 言 1990年頃から,−0.1K/sといった低い冷却速度でも結 晶化しないガラス形成能の高い合金組成が発見され,1) 「バルク金属ガラス」として注目されている.バルク金属 ガラスの寸法は大きいもので数 cmにも達するため,こ れまで主に機能性材料としての用途に使用されてきたア モルファス金属の構造材料としての応用も期待されてい る.一方で,アモルファス金属では,塑性変形が局所的 に集中するせん断帯の発生によりぜい性的な破壊が生じ ることが知られているが,その詳細なメカニズムについ ては不明な部分も多いために,せん断帯の発生機構や形 成過程などの理解が求められている.アモルファス構造 に基づいた塑性変形の素過程として,STZ (Shear transformation zone) モデル 2)や自由体積理論 3)などが提案さ れているものの,塑性変形にいたるためのクライテリオ ンやせん断帯形成との関係については明確ではない.ま た,アモルファス金属においては,領域ごとに局所構造 が大きく異なるために,構造ごとに塑性変形にいたるた めの臨界応力や臨界ひずみも異なるものと考えられ,塑 性変形の開始や発展に関して平均化された議論は可能で あっても,個々の構造の違いを反映した議論は容易では ない. 著者らのグループでは,アモルファス金属の塑性変形 メカニズムを理解するために,分子動力学法による種々 の変形シミュレーションを実施し,各原子位置における エネルギーの 2次導関数に相当する原子弾性剛性係数 B ij の正値性によって,各原子の安定性を評価する局所格子 不安定性解析 4)による検討を試みてきた.5), 6)B ijの値は局 所の力学状態を反映しており,たとえ局所構造やポテン シャル関数が異なっていても,det B ijが正か負かという 同一の判断基準による議論ができるので,塑性変形メカ ニズムの統一的な理解が期待できる.本研究では,アモ ルファス金属に対して押し込みシミュレーションを行い, アモルファス内部にて生じる塑性変形領域について原子 ひずみにより評価するとともに,原子弾性剛性係数 B ijの 正値性の変化を評価することで,せん断帯などの形成過 程などについて議論した. 2 原子弾性剛性係数 外力下で釣り合い状態にある 2つの状態 xとXでの応 力差 Δσij = σij (X) − σij (x)と x → Xのひずみ Δεklとは, 次の弾性剛性係数 Bijklで関係付けられる.","PeriodicalId":17366,"journal":{"name":"journal of the Japan Society for Testing Materials","volume":"76 1","pages":"179-184"},"PeriodicalIF":0.0,"publicationDate":"2013-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79205602","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
Effect of Crosslink Density on Nonlinear Stress-Strain Behavior of Epoxy Glasses Subjected to Large Deformation 交联密度对大变形环氧玻璃非线性应力-应变行为的影响
journal of the Japan Society for Testing Materials Pub Date : 2013-01-01 DOI: 10.2472/JSMS.62.22
S. Yoshioka, Y. Yokoyama
{"title":"Effect of Crosslink Density on Nonlinear Stress-Strain Behavior of Epoxy Glasses Subjected to Large Deformation","authors":"S. Yoshioka, Y. Yokoyama","doi":"10.2472/JSMS.62.22","DOIUrl":"https://doi.org/10.2472/JSMS.62.22","url":null,"abstract":"Effects of crosslinked molecular structures in glassy epoxy networks on the nonlinear viscoelastic behavior have been studied in terms of strain-induced structural change. We prepared four epoxy glasses with different crosslink densities from the same epoxy precursor by controlling fractions of chain-extender and crosslinker in curing agents. The epoxy glasses were subjected to uniaxial compression at a temperature 18K below the glass transition temperature of each sample. With increasing crosslink density, initial elastic moduli and yield stresses decreased, whereas flow stresses appearing after the strain softening almost unchanged, except for the most tightly crosslinked sample show-ing lower flow stresses. Results of density measurement and DSC showed that an increase in the crosslink density made the glassy structures more unstable. These results show that unstable glassy structures due to constraints on segmental mobility introduced by crosslinked molecular structures lessen the initial elastic modulus and the yield stress. On the other hand, the variation of crosslink density had almost no effect on the flow stresses of the glasses. This observation presumably indicates that molecular crosslinks have little effect on the strain-induced structural change. When the crosslink density comes to quite high, however, the crosslinks are likely to start affecting the flow stress, i.e. strain-induced unstable glassy structures.","PeriodicalId":17366,"journal":{"name":"journal of the Japan Society for Testing Materials","volume":"1 1","pages":"22-26"},"PeriodicalIF":0.0,"publicationDate":"2013-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89956734","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
A Study on Changes of Principal Stress in Welding Residual Stress Fields 焊接残余应力场中主应力变化的研究
journal of the Japan Society for Testing Materials Pub Date : 2013-01-01 DOI: 10.2472/JSMS.62.424
A. Tsuji, T. Hashimoto, S. Okano, M. Mochizuki
{"title":"A Study on Changes of Principal Stress in Welding Residual Stress Fields","authors":"A. Tsuji, T. Hashimoto, S. Okano, M. Mochizuki","doi":"10.2472/JSMS.62.424","DOIUrl":"https://doi.org/10.2472/JSMS.62.424","url":null,"abstract":"In this study, we focused on the principal stress value and direction in weld residual stress fields. We used specimens welded under three heat input conditions, and so the weld metal of each specimen had a different solidification structure. We evaluated the principal stress value and direction of the specimens by X-ray stress measurement. In the specimen welded under the smallest heat input condition, the weld metal showed a clear difference between the maximum principal stress and the minimum principal stress. However, in the specimen welded under the largest heat input condition, the maximum principal stress and the minimum principal stress were almost the same value. The principal stress direction changed significantly and shear stress occurred at the weld metal boundary in the specimens welded under the large heat input condition. In all specimens, the principal stress direction in the base metal changed. As conclusions, when the minimum and the maximum principal stress values were almost the same, the principal stress direction changed more noticeably. Additionally, due to the influence of the edge in the base metal, the principal stress direction changed significantly regardless of the welding condition.","PeriodicalId":17366,"journal":{"name":"journal of the Japan Society for Testing Materials","volume":"125 1","pages":"424-429"},"PeriodicalIF":0.0,"publicationDate":"2013-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85259369","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
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