論文 - 宮﨑　達二郎

Evaluation of debonding strength of single lap joint by the intensity of singular stress field

T. Miyazaki, N. -A. Noda

Journal of Physics: Conference Series ( Journal of Physics: Conference Series )  842 ( 1 )   2017年07月 [ 査読有り ]

掲載種別: 研究論文（国際会議プロシーディングス）

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How to obtain the adhesive strength for double lap joint by using single lap joint

Noda N.

Journal of Physics: Conference Series ( Journal of Physics: Conference Series )  843 ( 1 )   2017年07月 [ 査読有り ]

掲載種別: 研究論文（国際会議プロシーディングス）

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A Study on Relationship among Crack Initiation Size, Fatigue Limit and Hall Petch Relation

C. Makabe, S. A. Jafari, K. Ishikawa, T. Miyazaki

材料 ( 公益社団法人 日本材料学会 )  64 ( 11 ) 926 - 931   2017年05月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

　概要を見る

<p>The relationship between the microstructure and fatigue limit of a smooth specimen of tool steel SK85 (0.83% carbon steel) was investigated. Also, the fatigue limit of pure copper was evaluated. Push-pull tests were　performed under stress ratio <i>R</i> = -1. The initial length of a crack which initiates during the fatigue process is related to the size of a single crystal in the case of carbon steel. In this study, SK85 was chosen as a testing material to investigate the relationship between the microstructure and fatigue limit for the following reason. The original microstructure of the material used includes spherical microstructure. However, after annealing or normalizing under certain conditions, that microstructure changed to a lamellar microstructure. The fatigue limit of the heat treated SK85 could be evaluated by a relation in which the parameters are the hardness and initial crack length. The crack initiation sizes were related to the microstructure. The method of evaluating fatigue limit was investigated in consideration of the crack initiation size or the sizes of microstructures. Also, it was discussed the fact that the crack growth rate of SK85 was related to the condition of ferrite grain distributions. For the purpose of investigating the method of evaluating the fatigue limit, experiments with smooth and holed specimens of copper were performed. Furthermore, we investigated the relationship between the Hall Petch Relation and the method of evaluating fatigue limit in this study.</p>

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動的粘弾性試験結果からゴムのマスター曲線を予測する新しい計算法の開発

前田 成人, 藤川 正毅, 宮﨑 達二郎, 真壁 朝敏, 山辺 純一郎, 小石 正隆

日本機械学会論文集 ( 一般社団法人 日本機械学会 )  82 ( 843 ) 16 - 00022-16-00022   2016年 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

　概要を見る

<p>A new prediction technique of master curve from limited data measured under temperature variance and constant frequency in a dynamic measurement tester has been proposed. The highlight of this technique is a high-accuracy prediction despite the use of the limited data. Our methodology requires that experimental storage and loss moduli satisfy a certain relationship derived from the linear viscoelastic theory. This requirement enables to predict a precise master curve in a wide range of frequencies from the limited data. Investigations of the method's effectiveness and stability have been performed with two materials: carbon-black-filled styrene-butadiene rubber (SBR) with a volume fraction of 10% and silica-filled SBR with a volume fraction of 25%. The mater curves predicted with the limit data on the basis of the new technique were successfully consistent with those predicted by the ordinary method which uses a lot of data measured under temperature and frequency variances and it was demonstrated that the new method showed an excellent predictive performance.</p>

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接合丸棒の引張りと曲げの解析および特異応力場の強さの比較

宮﨑 達二郎, 野田 尚昭, 佐野 義一

日本機械学会論文集 ( 一般社団法人 日本機械学会 )  82 ( 842 ) 16 - 00222-16-00222   2016年 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

　概要を見る

<p>In this paper, the stress field at the interface corner edge of a bonded cylinder under bending is discussed by comparing with that under tension. Asymptotic description of the stress field under the bending consists of the singular stress term and the non-singular stress term as well as that under the tension. The similarity relation between the singular stresses under the tension and the bending is confirmed by performing 3D FE analyses on the bonded cylinders under the tension and the bending which are subdivided by the same mesh pattern. The ratios of the intensity of the singular stress field under the bending to that under the tension are computed changing material combinations variously, the maximum and minimum values of the ratios are shown in the table and the chart according to Dundurs' parameter (<i>α</i>,<i>β</i>). The intensity of singular stress field for the bonded cylinder cannot be controlled by Dundurs' parameter uniquely. However, because the differences between the maximum and minimum values are small, the ratios can be controlled by Dundurs' parameter. Then, the ratios are larger than 0.7 and smaller than 1.0 in almost all material combinations with <i>α</i>(<i>α</i>-2<i>β</i>) < 0.</p>

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引張りを受ける異材接合管と異材接合板の特異応力場の強さの比較

野田 尚昭, 王 澤鋒, 飯田 和樹, 佐野 義一, 宮﨑 達二郎

材料 ( 公益社団法人 日本材料学会 )  65 ( 6 ) 443 - 450   2016年 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

　概要を見る

In the previous research the intensity of singular stress at the end of interface for bonded plate was discussed under arbitrary material combinations. Then it was found that the bonded strength of butt joint can be evaluated in terms of the singular stress in good accuracy. In this study the intensity of singular stress for bonded pipe is newly discussed in comparison with the one of bonded plate. The finite element method is applied to calculate the intensity of singular stress with varying the material combination systematically. This method focuses on the results of first node locating at the end of the interface. Until now few studies are available for bonded pipe, in this study, the effect of the material combination on the intensity of singular stress is discussed by changing the material combination systematically. It is found that the intensity of singular stress of bonded pipe is 0.8-1.5times larger than the one of bonded plate for almost material combinations. This investigation may contribute to a better understanding of the debonding strength and initial interfacial cracking of bonded pipe.

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Debonding strength evaluation in terms of the intensity of singular stress at the interface corner with and without fictitious crack

N. -A. Noda, T. Miyazaki, R. Li, T. Uchikoba, Y. Sano, Y. Takase

International Journal of Adhesion and Adhesives ( Elsevier )  61   46 - 64   2015年09月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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Fatigue life and crack growth behavior in annealed and normalized 0.83％ carbon steel

C. Makabe, S. Yamazaki, T. Miyazaki, M. Fujikawa

Surface Review and Letters ( World Scientific )  22 ( 1 )   2015年02月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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A Review of Simple Methods for Arresting Crack Growth

Md. S. Ferdous, K. Naka, C. Makabe, T. Miyazaki

Advanced Materials Research ( Trans Tech Publications )  1119   185 - 190   2015年 [ 査読有り ]

掲載種別: 研究論文（国際会議プロシーディングス）

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疲労き裂進展停止に関する簡易手法の検討

名嘉海人, 真壁朝敏, 宮﨑達二郎

JCOSSAR2015論文集 ( その他の出版社 )    2015年 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

き裂発生寸法, 疲労強度そしてホールペッチの関係について

真壁 朝敏, Sharif A. JAFARI, 石川 清貴, 宮﨑 達二郎

材料 ( 公益社団法人 日本材料学会 )  64 ( 11 ) 926 - 931   2015年 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

　概要を見る

Relationship between microstructure and fatigue limit of a smooth specimen of tool steel SK85 (0.83% carbon steel) was investigated. Also, fatigue limit of a pure copper was evaluated. Push-pull tests were performed under stress ratio <i>R</i> = -1. The initial length of crack which initiate during fatigue process is related to the size of a single crystal in the case of carbon steel, etc. In this study, SK85 was chosen for a testing material to investigate the relationship between the microstructure and fatigue limit due to the following reason. The original microstructure of the material used includes spherical microstructure. However, after annealing or normalizing under some conditions, that microstructure changed to a lamellar microstructure. The fatigue limit of heat treating SK85 could be evaluated by a relation in whom the parameters are the hardness and initial crack length. The crack initiation sizes were related to the microstructure. The evaluation method of fatigue limit was investigated in consideration of initiation size of crack or sizes of microstructure. Also, it was discussed that the crack growth rate of SK85 was related to the condition of ferrite grain distributions. For the purpose of investigation of evaluation method of fatigue limit, experiments of smooth and holed specimens of copper were performed. Furthermore, we investigated the relationship between the Hall Petch relation and evaluation method of fatigue limit in this study.

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異種材料接合丸棒の特異応力場の強さの解析と異種材料接合板との比較について

宮﨑 達二郎, 野田 尚昭, 王 澤鋒, 佐野 義一

日本機械学会論文集 ( 一般社団法人 日本機械学会 )  81 ( 829 ) 15 - 00210-15-00210   2015年 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

　概要を見る

In this paper, an intensity of singular stress field for a bonded cylinder is compared with the one for a bonded plate, which was obtained in the previous studies accurately. The analytical method focuses on the stress values at the interface corner edge obtained by performing FE analyses on the unknown and reference models which are subdivided by the same mesh pattern. It is found that this analytical method which is useful for analyzing the bonded plate cannot be directly applied to the bonded cylinder because the strain in the circumferential direction causes non-singular stress component affecting singular stress evaluation. In order to eliminate the non-singular terms, they are expressed explicitly from the interfacial continuity conditions and the stress-free boundary conditions at the interface corner edge. Since the intensity of singular stress field for the bonded cylinder cannot be controlled by Dundurs' parameter uniquely, the maximum and minimum values of the intensities of singular stress field are shown in the table and the chart according to Dundurs' parameter. There are cases where the intensity of singular stress field for the bonded cylinder is one and a half times as large as that for the bonded plate even if the practical materials are combined.

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クラックアレスターとストップホールを用いた平板試験片のき裂進展抑制について

名嘉 海人, 真壁 朝敏, 宮崎 達二郎

圧力技術 ( 一般社団法人 日本高圧力技術協会 )  53 ( 2 ) 79 - 87   2015年 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

　概要を見る

Some simple technical methods for arresting crack growth have been proposed to prevent the fatigue failure of machinery. Drilling a stop-hole at the crack tip and attaching a patch at crack sites are typical methods for arresting crack growth. In this study, in addition to the drilling of a stop-hole, a crack arrester was attached across the crack to extend the fatigue life. In particular, a plate specimen having portions with different thicknesses was used in a push-pull test, and three types of crack arresters were prepared. The effect of the crack arrester on the prevention of crack growth when a crack is initiated in plates with different thicknesses was considered.

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はく離強度の便利で正確な評価法の提案

宮﨑達二郎, 野田尚昭, 内木場卓巳, 李戎, 佐野義一

自動車技術会論文集 ( 公益社団法人 自動車技術会 )  45 ( 5 ) 895 - 901   2014年09月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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接着接合板における特異応力の強さを用いた接着強度の簡便な評価法について

野田尚昭, 宮﨑達二郎, 内木場卓巳, 李戎, 佐野義一, 高瀬康

エレクトロニクス実装学会誌 ( 一般社団法人 エレクトロニクス実装学会 )  17 ( 2 ) 132 - 142   2014年03月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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特異応力場の強さに基づく単純重ね合わせ継ぎ手のはく離破壊基準の検討

宮﨑達二郎, 野田尚昭, 李戎, 内木場卓巳, 佐野義一

エレクトロニクス実装学会誌 ( 一般社団法人 エレクトロニクス実装学会 )  16 ( 2 ) 143 - 151   2013年03月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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Improvement of Fatigue Crack Growth Behavior in the Case of the Cracked Specimen with Relatively Narrow Width

Md. Shafiul Ferdous, C. Makabe, T. Miyazaki

Key Engineering Materials ( Trans Tech Publications )  525/526   597 - 600   2013年 [ 査読有り ]

掲載種別: 研究論文（国際会議プロシーディングス）

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Effect of Crack Initiation Size on Fatigue Strength in 0.85% Carbon Steel

C. Makabe, T. Miyazaki, N. Nakane, S. Yamazaki, T. Makishi, A. Murdani

Materials Science Forum ( Trans Tech Publications )  750   112 - 115   2013年 [ 査読有り ]

掲載種別: 研究論文（国際会議プロシーディングス）

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焼きなました工具鋼SK5の疲労限度の評価について

中根直樹, 眞喜志隆, Anggit Murdani, 宮﨑達二郎, 真壁朝敏

日本機械学会論文集A編 ( 一般社団法人 日本機械学会 )  78 ( 791 ) 989 - 999   2012年07月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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Acceleration of Fatigue Crack Growth after Overload in Carbon Steel

A.Yamauchi, H.Miyahara, C.Makabe, T.Miyazaki

International Journal of Modern Physics: Conference Series ( World Scientific )  6 ( 1 ) 239 - 244   2012年 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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