検索結果 1328件中 1-20 を表示

  • 同引張強度かつ異なる固溶炭素量を有するFe-Cr-Ni基準安定オーステナイトステンレス鋼の疲労挙動

    小川 卓郎 , 小山 元道 , 西倉 優理 , 津﨑 兼彰 , 野口 博司

    … <p>Fatigue properties of Fe-19Cr-8Ni-0.05C and Fe-19Cr-8Ni-0.14C steels were investigated using a rotating bending fatigue test machine. … Fatigue limit of both of the steels were dominated by critical stress amplitude for crack initiation. … Because of the austenite stability, the fatigue limit of the Fe-19Cr-8Ni-0.05C steel was 200 MPa higher than that of the Fe-19Cr-8Ni-0.14C steel. …

    鉄と鋼 104(2), 88-97, 2018

    J-STAGE

  • S45C調質材の二段多重変動荷重下の回転曲げ疲労寿命評価

    高瀬 徹 , 小山 敦弘 , 内田 武

    … <p>In order to design a rotating shaft, it is necessary to investigate the fatigue characteristics under the variable amplitude loading by using a rotating bending fatigue machine. … However, the stress amplitude cannot be changed frequently in a commercial rotating bending fatigue machine. …

    日本機械学会論文集, 2018

    J-STAGE

  • 高清浄度化した低合金鍛鋼40CrMo8の超高サイクル疲労特性に及ぼす高周波焼入れの影響

    菊池 将一 , 矢倉 亮太 , 藤綱 宣之 , 高岡 宏行 , 池上 智紀 , 松田 真理子 , 三浦 拓 , 上野 明 , 酒井 達雄

    … <p>In order to examine the effects of cleanliness and induction hardening on the very high cycle fatigue properties of low alloy forged steel (40CrMo8) used for crankshafts of Diesel engines for marine use, rotating bending fatigue tests were performed for specimens with different cleanliness (super clean steel or conventional steel) and thickness of hardened layer (0.2 mm or 0.4 mm). …

    材料 66(12), 893-899, 2017

    J-STAGE

  • 時効硬化Al合金のき裂伝ぱ形態に及ぼす大気環境の影響(回転曲げ疲労と超音波疲労)

    皮籠石 紀雄 , 仮屋 孝二 , 中村 祐三 , 永野 茂憲 , 岩本 竜一

    … <p>Fatigue cracks in some aluminum alloys propagate not in a typical tensile mode with striations but in a macroscopic shear direction with ductile facets under specific conditions. … In the previous paper, it was shown that this unique propagation of a shear mode crack occurred in high humidity under rotating bending fatigue and under ultrasonic loading fatigue irrespective of humidity. …

    日本機械学会論文集 83(855), 17-00274-17-00274, 2017

    J-STAGE

  • 時効硬化Al合金における特異な疲労破壊とその巨視的および微視的様相

    皮籠石 紀雄 , 中村 祐三 , 仮屋 孝二 , 永野 茂憲 , 岩本 竜一

    … <p>There are many studies reported that a fatigue crack propagated in a tensile mode macroscopically and the fracture surface was mainly occupied by striations in many metals. …

    日本機械学会論文集 83(855), 17-00273-17-00273, 2017

    J-STAGE

  • Fe-Cフェライト二元合金におけるコーキシング効果発現因子:ひずみ時効現象に注目して

    小山 元道 , 任 博泓 , 吉村 信幸 , 桜田 栄作 , 潮田 浩作 , 野口 博司

    … <p>The coaxing effect has been recognized as a phenomenon that enhances the fatigue resistance associated with work hardening and strain-age hardening. … To uncover the intrinsic factors that affect the degree of coaxing effect, rotating bending fatigue tests including a process of stepwise stress increases every 10<sup>7</sup> …

    鉄と鋼 103(11), 660-666, 2017

    J-STAGE

  • 回転曲げ疲労試験における繰返し速度の拡張について

    山本 泰三 , 廉 本寧 , 後藤 浩二

    … <p>Fatigue property in gigacycle regime is focused as an important subject in recent years. … In such a long-life region, a tremendous long period is required to perform the fatigue tests. … In order to overcome this difficulty, special types of fatigue testing machines in rotating bending whose loading type is cantilever bending has been developed. …

    日本機械学会論文集 83(852), 16-00535-16-00535, 2017

    J-STAGE

  • 回転曲げ疲労試験における繰返し速度の拡張について

    山本 泰三 , 廉 本寧 , 後藤 浩二

    … <p>Fatigue property in gigacycle regime is focused as an important subject in recent years. … In such a long-life region, a tremendous long period is required to perform the fatigue tests. … In order to overcome this difficulty, special types of fatigue testing machines in rotating bending whose loading type is cantilever bending has been developed. …

    日本機械学会論文集, 2017

    J-STAGE

  • ガス窒化処理したSCM435鋼の回転曲げ疲労強度に及ぼす表面化合物相の影響

    平岡 泰 , 石田 暁丈 , 梅澤 修

    <p>ガス窒化・軟窒化したSCM435鋼の回転曲げ疲労強度を評価した。化合物層形成材は化合物層無し材よりも高い疲労強度を示し,γ′相の場合において顕著であった。化合物層は,拡散層より高い降伏強さと大きな圧縮残留応力を示すことから,初期き裂抑制効果がある。ε相,γ′相いずれにおいても複数の微小き裂形成により,主き裂先端の応力集中を緩和し,疲労強度を高める。さらに,γ′化合物は,ε化合物よ …

    熱処理 57(2), 64-72, 2017

    機関リポジトリ J-STAGE

  • スーパー二相ステンレス鋼の疲労強度に及ぼす荷重様式と平均応力の影響

    有働 竜二郎 , 西川 嗣彬 , 波東 久光 , 宮崎 克雅 , 政木 清孝 , 沼倉 宏

    … <p>As a first step toward building a database of fatigue strength of super duplex stainless steel S32750, fatigue tests have been conducted by three methods, axial loading, plane bending and rotating bending, and with some different values of stress ratio <i>R</i> …

    鉄と鋼 103(4), 201-207, 2017

    J-STAGE

  • Intrinsic Factors that Trigger the Coaxing Effect in Binary Fe–C Ferritic Alloys with a Focus on Strain Aging

    Koyama Motomichi , Ren Bohong , Yoshimura Nobuyuki , Sakurada Eisaku , Ushioda Kohsaku , Noguchi Hiroshi

    … <p>The coaxing effect has been recognized as a phenomenon that enhances the fatigue resistance associated with work hardening and strain-age hardening. … To uncover the intrinsic factors that affect the degree of coaxing effect, rotating bending fatigue tests including a process of stepwise stress increases every 10<sup>7</sup> …

    ISIJ International 57(2), 358-364, 2017

    J-STAGE

  • スーパー二相ステンレス鋼の疲労強度に及ぼす荷重様式と平均応力の影響

    有働 竜二郎 , 西川 嗣彬 , 波東 久光 , 宮崎 克雅 , 政木 清孝 , 沼倉 宏

    … <p>As a first step toward building a database of fatigue strength of super duplex stainless steel S32750, fatigue tests have been conducted by three methods, axial loading, plane bending and rotating bending, and with some different values of stress ratio <i>R</i> … The fatigue limits from the bending tests turned out appreciably higher than those from the axial loading. …

    鉄と鋼, 2017

    J-STAGE

  • C-22 GFRPの疲労強度特性に及ぼす切欠きの影響

    瀬戸口 進太 , 小田原 悟

    … It was clarified that the notch effect on the fatigue strength characteristics of the GFRP used for blade material of a small wind turbine. … To elucidate the fatigue strength characteristics at rotating bending fatigue test, observation of the fracture surface of the test piece was conducted. … Furthermore it can track the behavior of crack growth, and the mechanism of fatigue properties of GFRP was considered. …

    日本機械学会九州支部講演論文集 2016(69), 121-122, 2016-03-15

  • Ti-6Al-4V合金の高サイクル疲労特性に及ぼすジルコニアショットピーニングの影響

    政木 清孝 , 與那國 優希 , 久森 紀之 , 須賀 祐一郎 , 小林 祐次 , 後和 大輔

    … <p>Rotating bending loading and axial loading fatigue tests were conducted to investigate the effect of zirconia shot peening on fatigue properties of Ti-6Al-4V ELI alloy. … As a result of the rotating bending fatigue tests, the fatigue lives of shot peened specimen were longer life than non-peened specimen. …

    材料 65(9), 679-686, 2016

    J-STAGE

  • アルミニウム合金A5083P-Oのギガサイクル疲労特性と停留き裂に関する検討

    西川 嗣彬 , 竹内 悦男 , 古谷 佳之

    … <p>In this study, Giga-cycle fatigue properties for A5083P-O aluminum alloy were investigated by ultrasonic fatigue testing at 20 kHz, rotating bending fatigue testing at 100 Hz and electromagnetic resonance type fatigue testing at 100 Hz. …

    材料 65(9), 672-678, 2016

    J-STAGE

  • 陽電子消滅法によるステンレス鋼 SUS316 の微小疲労き裂発生挙動評価

    植松 美彦 , 服部 兼久 , 柿内 利文 , 上杉 直也 , 仲尾 文哉

    … <p>Fatigue cracks, leading to catastrophic fracture of metal structure, generally initiate by the cyclic stress even under yield stress. … At the first stage of fatigue process, movement and increase of lattice defects (dislocations), namely microscopic sliding takes place, and crack initiation follows thereafter. …

    ばね論文集 2016(61), 7-12, 2016

    J-STAGE

  • Mechanical Properties of Case-Hardened Low Cr Sintered Steel

    KOBAYASHI Akio , MAETANI Toshio , OGURA Kuniaki , NAKAMURA Naomichi , UNAMI Shigeru , OZAKI Yukiko

    … 5CRA) shows a rotating bending fatigue limit of 510 MPa after compacting, sintering and case-hardening process. … In spite of the higher fatigue limit, its tensile strength is lower than that of the 4Ni based material. …

    粉体および粉末冶金 63(7), 573-578, 2016

    J-STAGE

  • 水焼入れFe-Cフェライト鋼における粒界き裂発生および微小き裂進展挙動

    小山 元道 , 周佳 羲 , 吉田 裕一 , 吉村 信幸 , 潮田 浩作 , 野口 博司

    … The fatigue crack initiation and propagation behavior of a water-quenched binary Fe-C fully ferritic steel was investigated though rotating-bending fatigue testing. … As a result, intergranular cracking was the dominant cause of fatigue damage in the steel. … Dominancy of the intergranular fatigue crack propagation increased with increasing stress amplitude. …

    鉄と鋼 102(5), 268-273, 2016

    J-STAGE

  • Effect of Ultrasonic Shot Peening on High Cycle Fatigue Behavior in Type 304 Stainless Steel at Elevated Temperature

    KAKIUCHI Toshifumi , UEMATSU Yoshihiko , HASEGAWA Norihiko , KONDOH Eisuke

    … Ultrasonic shot peening was applied to type 304 austenitic stainless steel and four-point rotating bending fatigue tests were performed at room temperature (R.T.) and 573K up to 108 cycles. … The fatigue strengths at 573K were much lower than those at R.T. … The shot-peened specimens exhibited higher fatigue strengths than untreated ones at both R.T. …

    材料 65(4), 325-330, 2016

    J-STAGE

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