Search Results 1-20 of 187

  • Foundational investigation for detection of weld-bead non-penetrating fatigue crack by temperature gap method  [in Japanese]

    Izumi Yui , Mizokami Yoshiaki , Uenishi Koki , Sakagami Takahide , Hayashi Masahiro

    … The results of verification experiments using slit specimens and fatigue crack specimens are shown. …

    Journal of Structural Engineering, A 66A(0), 540-548, 2020

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  • Fatigue Limit Improvement and Rendering a Defect Harmless for Stainless Steel Welded Joint Containing a Crack-like Surface Defect:-Effects of Laser Peening-  [in Japanese]

    FUEKI Ryutaro , TAKAHASHI Koji , KUMENO Fumiaki , SHIBUYA Norihito

    … The effects of laser peening (LP) on the bending fatigue limit of an austenitic stainless steel JIS-SUS316 welded joint containing an artificial semi-circular slit on the weld toe were investigated. … Then, three-point bending fatigue tests were carried out at a stress ratio of <I>R</I>=0.05 for both LP treated welded specimens with the slit on the weld toe and those without the slit. …

    Journal of High Pressure Institute of Japan 57(2), 82-91, 2019

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  • Improvement of Fatigue Limit and Rendering a Surface Defect Harmless for Stainless Steel Welded Joint Containing a Crack-like Defect:-Effect of Laser Peening-  [in Japanese]

    FUEKI Ryutaro , TAKAHASHI Koji , KUMENO Fumiaki , SHIBUYA Norihito

    … <p>The effects of laser peening (LP) on the bending fatigue limit of an austenitic stainless steel JIS-SUS316 welded joint containing an artificial semi-circular slit on the weld toe were investigated. … = 0.05 for both LP treated welded specimens with the slit on the weld toe and those without the slit. … LP treated specimens with a slit depth of <i>a</i> …

    The Proceedings of the Materials and Mechanics Conference 2018(0), OS1214, 2018

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  • Flaw Detection with a Point-focusing Electromagnetic Acoustic Transducer and Local Vibration around the Slit  [in Japanese]

    ASHIDA Kazuhiro , TAKISHITA Takashi , TSUBOI Seiya , NAKAMURA Nobutomo , OGI Hirotsugu , HIRAO Masahiko

    … In the previous studies, we developed the point-focusing electromagnetic acoustic transducer (PF-EMAT) for inspecting stainless steel piping, and found that the slit of 0.05 mm depth and artificially introduced stress corrosion cracking of 0.5 mm depth, being close to the weld, were well detectable at the frequency of 2.0 MHz. … We also observed that the echo amplitude of SV wave from slits shows oscillation with nearly equal spacing as the slit depth increases. …

    Journal of The Japanese Society for Non-Destructive Inspection 66(9), 437-442, 2017

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  • RELATIONSHIP OF MACRO STRESS AND MAXIMUM PRINCIPAL STRESS ON ELECTRO-SLAG WELD ZONE BETWEEN INTERIOR DIAPHRAGM AND BOX COLUMN  [in Japanese]

    ISHII Takumi , SONG Yong Hun , SHIMOKAWA Hiroumi , SUZUKI Takahiko , HARADA Yukihiro , MORITA Koji

    … <p>In the Electro-slag welding(ESW) joint, under severe earthquakes, it is worried about an early brittle fracture in the tip of a slit between a skin plate and a backing strip. … It suggests that the required fracture toughness to prevent the brittle fracture of ESW joint can be estimated if the MPA around the tip of a slit in ESW joint is obtained. …

    Kou kouzou rombunshuu 23(89), 89_59-89_71, 2016

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  • Evaluation of Cold Cracking in High-Strength Steel Weld Metal Based on Local Critical Conditions Incorporating Stress and Diffusible Hydrogen Distributions  [in Japanese]

    MIKAMI Yoshiki , KAWABE Nao , ISHIKAWA Nobuyuki , MOCHIZUKI Masahito

    … Cold cracking has been investigated through slit-type weld cracking tests. … However, the process of cold cracking of welds should be based on more microscopic criteria, because stress concentration and diffusible hydrogen accumulation are the governing processes of cold cracking on a microscopic scale.<br>In this study, cold cracking of a high-strength steel weld metal was evaluated by considering local stress and locally accumulated hydrogen concentration. …

    QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY 34(2), 67-80, 2016

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  • NON DESTRUCTIVE EVALUATION OF RIB-TO-DECK FATIGUE CRACK IN DECK PLATE OF ORTHOTROPIC STEEL DECK SYSTEM BY THE PHASED ARRAY ULTRASONIC TESTING  [in Japanese]

    SHIRAHATA Hiromi , KAMIKURI Takuma

    鋼床版溶接部の疲労損傷において,本研究は閉断面縦リブとデッキプレートとの溶接部に発生する疲労き裂を対象としている.対象の疲労き裂検出に特化したフェーズドアレイ超音波探傷システムを構築することが目的である.フェーズドアレイ超音波探傷は可変角で入射波を送信したり,任意の点に入射波を収束させることができる.1素子ごとの送受信の組み合わせで波形を収録し,コンピュータ上でソフト的に収束を再現する方法も検討さ …

    Journal of Japan Society of Civil Engineers, Ser. A1 (Structural Engineering & Earthquake Engineering (SE/EE)) 72(1), 206-219, 2016

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  • Establishment of unified fatigue design maps for different types of fracture mode of single-sided fillet welded T-joints  [in Japanese]

    KITA Yasuki , KITAGUCHI Atsushi , NAGANAWA Takashi

    … Two load conditions, which were given the tensile and compressive stresses in the weld toe, were applied, and fatigue strengths at 2×10<sup>6</sup> … In the analyses, initial toe crack of 0.2 mm and root gap were modeled by slit, and opening displacements of the slit tip were calculated. …

    Transactions of the JSME (in Japanese) 81(830), 15-00113-15-00113, 2015

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  • Improvement of Fatigue Limit and Rendering Crack Harmless by Peening for Stainless Steel Containing a Crack at the Weld Toe Zone  [in Japanese]

    FUEKI Ryutaro , ABE Hisanori , TAKAHASHI Koji , ANDO Kotoji , HOUJOU Keiji , HANDA Mitsuru

    … Effects of Portable Pneumatic needle-Peening (PPP) on the bending fatigue limit of type 316 stainless steel welded joint containing an artificial semi-circular slit on weld toe were investigated. … PPP were conducted on the weld toe containing a semi-circular slit with a depth of <I>a</I>=1. … The fatigue limit of the peened specimen having a semi-circular slit of <I>a</I>=1. …

    Journal of High Pressure Institute of Japan 53(3), 140-148, 2015

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  • Effect of Texture on the Cold Cracking in Weld Zone of T23 Steel

    Jin Yujing , Lu Hao

    … Y-slit welded joints without preheating were used to prepare the cold cracks in T23 steel. …

    ISIJ International 55(1), 308-311, 2015

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  • OS0914-219 Improvement of Fatigue Limit by Peening for Welded Joint Containing a Surface Crack : Development of Prediction Method of Fatigue Limit  [in Japanese]

    FUEKI Ryutaro , TAKAHASHI Koji

    … The mechanisms of improvement of fatigue limit by portable pneumatic needle-peening (PPP) were investigated for a welded joint specimen of austenitic stainless steel (JIS-SUS316) containing a semi-circular slit at the weld toe. … The residual stress near the weld toe was measured before and after PPP. … Moreover, finite element analysis was conducted in order to calculate the stress concentration factor of the weld toe before and after PPP. …

    The Proceedings of the Materials and Mechanics Conference 2015(0), _OS0914-21-_OS0914-21, 2015

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  • Stress Evaluation in Material with Coarse Grains Using Area Detector  [in Japanese]

    SUZUKI Kenji , SHOBU Takahisa , SHIRO Ayumi , ZHANG Shuoyuan

    … The spiral slit-system and DSTM (diffraction spot trace method) are under development in order to evaluate internal stresses of materials with coarse grains. … The spiral slit-system was improved so that the length of the gauge volume is independent of the diffraction angle. … The bending stress in the specimen with coarse grains was measured in order to confirm performance of this advanced spiral slit-system. …

    Journal of the Society of Materials Science, Japan 63(7), 527-532, 2014

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  • OS2137 Effect of peening on the fatigue limit of welded structural steel with surface crack  [in Japanese]

    HOUJOU Keiji , TAKAHASHI Koji , ANDO Kotoji

    … The purpose of this study is to investigate the effect of peening on the fatigue limit of steels for welded structure with a crack in the weld toe zone. … An artificial semicircular slit was created in the weld toe, and peening was conducted. … Owing to the shot peening, the maximum slit depths that can be rendered harmless were 1.0 and 1.2 mm in SUS316 and SM490, respectively. …

    The Proceedings of the Materials and Mechanics Conference 2014(0), _OS2137-1_-_OS2137-2_, 2014

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  • OS2113 Development of Technology of Life Prolongation of Welded Joint Containing a Fatigue Crack  [in Japanese]

    FUEKI Ryutaro , ABE Hisanori , TAKAHASHI Koji , KOIKE Hitonobu

    … The maximum crack size rendered harmless on the weld toe of type 316 stainless steel welded joint by conducting Portable Pneumatic needle-Peening (PPP) was estimated focusing on stress intensity factor of crack tip. … Then, it was found that the maximum crack size rendered harmless is 1.44 mm by comparing the stress intensity factor of semi-circular slit and the threshold stress intensity factor. …

    The Proceedings of the Materials and Mechanics Conference 2014(0), _OS2113-1_-_OS2113-3_, 2014

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  • Introducing fatigue cracks to welded details of plate girder for training of inspectors  [in Japanese]

    Yamada Kentaro , Oda Hirotaka

    … Fourteen fatigue cracks were introduced various welded joints, such as upper end of vertical stiffeners, gussets welded to girder webs, ends of horizontal stiffeners, and end weld of gusset through web slit. …

    Kozo Kogaku Ronbunshu. A (Journal of Structural Engineering. A) 59A(0), 790-797, 2013

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  • Numerical Crack Growth Analysis in ICM Housing Using S-Version FEM  [in Japanese]

    KIKUCHI Masanori , 和田 義孝 , 須賀 一博 , 岩松 史則 , 新宅 勇一

    … It has been reported that stress corrosion cracking damaged in-core monitor housing, which occurred in weld heat-affected zone because of the existence of residual stress. … Next, effect of the slit, which exists between ICM Housing and Pressure Vessel is evaluated. … It is shown that the existences of slit increases stress intensity factors of growing surface crack. …

    TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series A 79(798), 119-129, 2013

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  • Improvement of Fatigue Limit and Rendering Crack Harmless by Peening for Rolled Steel Containing a Crack at the Weld Toe Zone  [in Japanese]

    HOUJOU Keiji , 高橋 宏治 , 安藤 柱 , 関口 祐司

    … This study describes an investigation of the effect of peening on the fatigue limit of rolled steel containing a crack at the weld toe. … 3-point bending specimens with a weld zone were prepared for fatigue test. … An artificial semi-circular slit was made into the weld toe, and subsequently the weld toe was peened by needle-peening. …

    TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series A 79(797), 110-114, 2013

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  • 206 Fracture Design Maps for Single-sided Fillet Welded T-joints  [in Japanese]

    KITA Yasuki , KITAGUCHI Atsushi , NAGANAWA Takashi

    … Two load conditions, which were given the tensile and compressive stresses in the weld toe, were applied, and fatigue strengths at 2×10^6 cycles were determined. … In the analyses, initial toe crack of 0.2mm and root gap were modeled by slit, and opening displacements of the slit tip were calculated. …

    The Proceedings of Ibaraki District Conference 2013.21(0), 247-248, 2013

    J-STAGE 

  • 201 Improvement of Fatigue Limit and Rendering Crack Harmless by Peening for Rolled steel Containing a Crack at the Weld Toe Zone  [in Japanese]

    Sekiguchi Yuji , Takahashi Koji , Houjou Keiji

    … This study describes an investigation of the effect of peening on the fatigue limit of rolled steel containing a crack at the weld toe.3-point bending specimens with a weld zone were prepared for fatigue test. … An artificial semi-circular slit was made into the weld toe, and subsequently the weld toe was peened by needle-peening. … (1) The fatigue limits of specimens containing a slit improved considerably by peening. …

    The Proceedings of Ibaraki District Conference 2013.21(0), 237-238, 2013

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  • GS25 Improvment of fatigue limit by peening for rolled steel with weld zone  [in Japanese]

    HOUJOU Keiji , TAKAHASHI Koji , ANDO Kotoji

    … This study describes an investigation of the effect of peening on the fatigue limit of rolled steel containing a crack at the weld toe. … 3-point bending specimens with a weld zone were prepared for fatigue test. … An artificial semi-circular slit was made into the weld toe, and subsequently the weld toe was peened by needle-peening. …

    The Proceedings of the Materials and Mechanics Conference 2013(0), _GS25-1_-_GS25-3_, 2013

    J-STAGE 

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