Search Results 1-20 of 560

  • EVALUATION ON PLASTIC DEFORMATION CAPACITY OF STEEL BEAM ENDS WITH LOCAL BUCKLING AND FRACTURE UNDER CYCLIC LOADING USING FE ANALYSIS  [in Japanese]

    SAWAMOTO Yoshikazu , KUBOTA Jun , OHSAKI Makoto

    … The cyclic damage rule is a fatigue damage law based on Continuum Damage Mechanics (CDM), and the monotonic damage rule is a damage rule for a large ductility factor equivalent to monotonic loading. … As a result of the FE analysis, it is found that a crack occurs at the toe of the weld access hole on the beam flange, and propagates in the flange width direction. …

    Journal of Structural and Construction Engineering (Transactions of AIJ) (767), 105-115, 2020-01

    J-STAGE  AIJ 

  • Evaluation of transverse crack initiation of cross-ply CFRP laminates subjected to very high cycle fatigue loading  [in Japanese]

    MIYAKOSHI Tsuyoshi , ATSUMI Takeru , KOSUGI Kensuke , HOSOI Atsushi , TSUDA Terumasa , SHIMAMURA Yoshinobu , KAWADA Hiroyuki

    … They are subjected over 108 loading cycles during their operation time, since it is essential to investigate the very high cycle fatigue (VHCF) behavior of CFRPs. … To accelerate the test time up to VHCF regime, ultrasonic fatigue testing machine which can apply the specimen ultrasonic load at a frequency of 20 kHz was used. …

    The Proceedings of Conference of Kanto Branch 2020(0), 16A03, 2020

    J-STAGE 

  • Fatigue Properties of Quenching and Tempering Steel Using Super Rapid Induction Heating

    FUKUTA Tadao , KUROSHIMA Yoshihito , KANESAKI Manato , OZAKI Koichi

    … In this study, we investigated the fatigue properties of carbon steel treated by induction quenching and tempering using a super-rapid induction heating technique. … In addition, no clear grain refining effect was found in the fatigue limit of induction-quenched steel in the range of the quenching conditions of this study. …

    Advanced Experimental Mechanics 5(0), 97-102, 2020

    J-STAGE 

  • Experiments of Self-wastage Phenomena Elucidation in Steam Generator Tube of Sodium-cooled Fast Reactor  [in Japanese]

    UMEDA Ryota , SHIMOYAMA Kazuhito , KURIHARA Akikazu

    … In this study, the authors performed self-wastage experiments under a high sodium temperature condition to evaluate the effects of the wastage form/geometry using two types of initial defect, i.e., the microfine pinhole and fatigue crack, and of the water leakage rate on the self-wastage rate. … Taking into consideration the influence of crack type, we confirmed that the self-wastage rate did not strongly depend on the initial defect geometry. …

    Transactions of the Atomic Energy Society of Japan 19(4), 234-244, 2020

    J-STAGE 

  • Evaluation of detailed transverse crack propagation toward thickness direction for CF/PEEK quasi-isotropic laminates under fatigue loading

    TSUNODA Dai , KOHARA Masahiro , NODA Keita , HOSOI Atsushi , SUGIURA Naoki , HAYASHI Takahiro , KAWADA Hiroyuki

    … Therefore, it is important to ensure the long-term reliability of CF/PEEK laminates and evaluate the propagation of transverse cracks, which are generally the initial damage incurred by multidirectional laminates under fatigue loading. … This study evaluated the detailed mechanism of transverse crack propagation toward the thickness direction in CF/PEEK quasi-isotropic laminates under fatigue loading. …

    Mechanical Engineering Journal 7(5), 20-00128-20-00128, 2020

    J-STAGE 

  • Effectiveness of Ultrasonic Shot Peening on Stainless Cast Steel SCS6 Containing a Fatigue Crack

    Arakawa Jinta , Hayashi Yoshiichirou , Akebono Hiroyuki , Sugeta Atsushi

    … <p>In order to investigate the effectiveness of ultrasonic shot peening treatment (USP) as repairing method for SCS6 material with surficial fatigue crack for hydraulic turbine runner, plane bending fatigue tests were carried out for USP treated SCS6 containing a surface fatigue crack with 1 mm in length and the fatigue crack propagation after USP was observed by a plastic replica method. …

    MATERIALS TRANSACTIONS 61(8), 1593-1599, 2020

    J-STAGE 

  • Development of fatigue life evaluation technology for multi-layer bellows exhaust pipe  [in Japanese]

    KAWASHITA Michihiro , SHIMODAIRA Takayuki , OHNO Takayuki , HOSHI Akio , ITO Kenji , SHINJI Yasuhiko , KUMAI Shinji

    … In order to ensure the reliability of the pipe under such harsh conditions, we developed a technology for evaluating the fatigue life of the bellows. … First, in order to get the appropriate fatigue life curve of the bellows, the fatigue tests of bellows were conducted. … In the fatigue tests, we judged that a fracture had occurred when a crack was detected in either the outer layer or the inner layer of the bellows. …

    Transactions of the JSME (in Japanese) 86(886), 19-00396-19-00396, 2020

    J-STAGE 

  • Effects of Wall Thickness on Fatigue Strength and Fatigue Crack Growth Behavior in CV Graphite Cast Iron  [in Japanese]

    Shimizu Kazumichi , Kusumoto Kenta , Tani Hidemasa , Yasuda Hiroyuki , Funabiki Takafumi , Yoshioka Koki

    … <p>  Amidst the growing needs to apply CV graphite cast iron to large castings, there have only been a few reports on the fatigue strength characteristics of CV graphite cast iron. …

    Journal of Japan Foundry Engineering Society 92(5), 232-236, 2020

    J-STAGE 

  • Prediction of Fatigue Life of Steels in Consideration of Defect-induced Crack Initiation and Propagation

    Sakaguchi Ryota , Shiraiwa Takayuki , Chivavibul Pornthep , Enoki Manabu

    … <p>In the present study, the prediction of fatigue life by representing characteristic variations of defects with probability distribution functions was conducted by dividing the fatigue process into the crack initiation and crack propagation. …

    ISIJ International 60(4), 799-806, 2020

    J-STAGE 

  • Detection of fatigue damage occurrence and progress in stud welds of steel-concrete composite deck by infrared thermography  [in Japanese]

    Mizuno Hiroshi , Ogami Hiroshi , Yamashita Takahiro , Shiozawa Daiki , Izumi Yui , Sakagami Takahide , Matsui Shigeyuki

    … <p>Steel-concrete composite decks are increasingly applied for highway bridges to reduce the initial cost of construction. … In Robinson type, steel plate and concrete are integrated with studs, but that studs should be careful of fatigue damage due to repeated loading of traffic wheel loads. … Because the studs subjected with rotating shear force by running wheel loads, fatigue crack occurs at welding toe of the stud. …

    Journal of Structural Engineering, A 66A(0), 895-903, 2020

    J-STAGE 

  • Grain Boundary Cracking Mechanism in Ni-base Alloy 617 Under Creep-fatigue Loading at Elevated Temperatures  [in Japanese]

    ISHIHARA Kenta , SUZUKI Ken , MIURA Hideo

    … Under the creep and creep-fatigue conditions at elevated temperature, however, the effective lifetime of heat-resistant alloy such as Ni-base Alloy 617 which has high strength and good corrosion resistance at about 750oC was found to decrease drastically. … Main reason for this short lifetime is attributed to the change in the crack initiation and propagation paths from trasgranular one to intergranular one. …

    The Proceedings of the Materials and Mechanics Conference 2019(0), PS13, 2019

    J-STAGE 

  • Alloy design strategy for fatigue-resistant steels and associated microstructure observations at a small fatigue crack tip  [in Japanese]

    KOYAMA Motomichi

    … <p>I here present recent examples of crack tip microstructure observations. … In particular, special emphasis is placed on dislocation microstructure evolution near a small fatigue crack tip, observed by electron backscatter diffraction measurements and electron channeling contrast imaging. … Both of the techniques can show microstructures at a specific location such as plastic zone at a crack tip in a bulk specimen. …

    The Proceedings of the Materials and Mechanics Conference 2019(0), OS1708, 2019

    J-STAGE 

  • What is shear mode fatigue crack propagation?  [in Japanese]

    HAMADA Shigeru , UEDA Masaharu , NOGUCHI Hiroshi

    … <p>Mode I and Mode II are defined as terms of fracture mechanics which express the deformation mode of a crack under some loading. … However, the terminology which expresses the fatigue crack propagation mode under a mode or mixed-mode loading is not clearly defined until now. …

    The Proceedings of the Materials and Mechanics Conference 2019(0), OS2004, 2019

    J-STAGE 

  • Growth behaviour of small cracks in Al-Mg-Si alloy with strain-aging nature  [in Japanese]

    KOZAWA Tomoyuki , TAKAHASHI Yoshimasa , TAKUMA Masanori , SAITO Kenichi , SATOH Tomohiro , NOGUCHI Hiroshi , SHIKAMA Takahiro

    … <p>The purpose of this study is to clarify the effect of solute Mg on fatigue strength characteristics. … The high-cycle fatigue properties of an Al-Mg2Si quasi-binary alloy (6061) and a modified alloy containing excess solute Mg are compared in terms of the growth behavior of initial small cracks. …

    The Proceedings of the Materials and Mechanics Conference 2019(0), OS0306, 2019

    J-STAGE 

  • Effect of initial crack length on the transition of fatigue properties for precipitation hardened steel

    Verma Virendra Kumar , Liu He , Hamada Shigeru , Yokoi Tatsuo , Noguchi Hiroshi

    … The fatigue behavior of the two steels for initially grain and long crack is analyzed. … The main focus point in this part is the crack propagation behavior. … The two materials are tested for fatigue crack growth and crack growth is monitored with the help of replica technique. …

    The Proceedings of the Materials and Mechanics Conference 2019(0), OS0112, 2019

    J-STAGE 

  • Degradation of the Strength of Grain Boundaries in Ni-base Superalloy Alloy617 Under Creep-Fatigue Loading at Elevated Temperatures  [in Japanese]

    SUZUKI Wataru , SUZUKI Ken , MIURA Hideo

    … Therefore, it is necessary to consider the effect of creep-fatigue damage. … Even though the conventional linear damage rule has been used for the evaluation of creep-fatigue damage, it was found that the critical damage to final fracture decreases drastically depending on loading conditions. … The main reason of this drastic decrease is attributed to the change of crack path from transgranular to intergranular under creep-fatigue loadings. …

    The Proceedings of Mechanical Engineering Congress, Japan 2019(0), J04234P, 2019

    J-STAGE 

  • Initial Damage Mechanism of Nickel-Based Alloy 625 Under Creep Loadings at Elevated Temperatures  [in Japanese]

    梁 言 , Yifan LUO , 鈴木 研 , 三浦 英生

    … In addition, Ni-based superalloys have to suffer creep-fatigue random loading because thermal power plants have to compensate the random output of various renewable energies. … It was found that the lifetime of Ni-based superalloys under creep-fatigue loading was much shorter than that under simple fatigue or creep loading. … Thus, the elucidation of the initial damage mechanism of Alloy 625 under various loading is indispensable. …

    The Proceedings of Mechanical Engineering Congress, Japan 2019(0), J02334, 2019

    J-STAGE 

  • Effectiveness of Ultrasonic Shot Peening on Stainless Cast Steel SCS6 Containing a Fatigue Crack  [in Japanese]

    ARAKAWA Jinta , HAYASHI Yoshiichirou , AKEBONO Hiroyuki , SUGETA Atsushi

    … <p>In order to investigate the effectiveness of ultrasonic shot peening treatment (USP) as repairing method for SCS6 material with surficial fatigue crack for hydraulic turbine runner, plane bending fatigue tests were carried out for USP treated SCS6 containing a surface fatigue crack with 1 mm in length and the fatigue crack propagation after USP was observed by a plastic replica method. …

    Journal of the Society of Materials Science, Japan 68(12), 897-903, 2019

    J-STAGE 

  • Propagation of Large Spalls in Rolling Bearings

    Morales-Espejel Guillermo E. , Engelen Philip , Nijen Gerrit van

    … The proposed model is validated using experiments, where rolling bearings with initial pre-damage have been tested and the surface spall progression has been monitored in time. … Without the need of a more sophisticated crack propagation model, at least this seems to be the case for a relatively large spall (larger than the Hertzian contact). …

    Tribology Online 14(5), 254-266, 2019

    J-STAGE 

  • Application of damage model based on void growth analysis to ductile crack growth simulation  [in Japanese]

    YAMADA Takehisa , OHATA Mitsuru

    … The aim of this study is to confirm that ductile crack growth resistance of cracked components can be predicted by simulation model with the proposed damage model, which is derived by unit cell analyses with an initial void and reflects void growth behavior until ductile crack initiation. …

    QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY 37(3), 115-124, 2019

    J-STAGE 

Page Top