第2回
Ni基合金溶接部の溶接条件が超音波探傷の欠陥検出に与える影響
著者:
西川 聡,Satoru NISHIKAWA,古川 敬,Takashi FURUKAWA,古村 一朗,Ichiro KOMURA,堀井 行彦,Yukihiko HORII
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キーワードタグ:
In order to study the influence of welding condition on the detectability of flaws in Ni based alloy by UT, we lding conditions, such as heat input, magnetic stirring and weaving were changed. Flaws in small heat input we ld joints was difficult to be detected because of the presence of high noise. On the contrary, welded joints m ade with large heat input and weaving showed lower noise and EDM notches in these joints were easily detected....
英字タイトル:
The Influence of Welding Condition on Flaw Detectability by Ultrasonic Test in Ni Based alloy welds.
第14回
SUS配管溶接部における柱状晶組織からのUT信号シミュレーション
著者:
直本 保,Tamotsu JIKIMOTO,上山 芳教,Yoshinori KAMIYAMA,古川 敬,Takashi FURUKAWA
発刊日:
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In the ultrasonic testing (UT) for weld part of austenitic stainless, it is generally recognized that the UT inspection has difficulty due to dispersion, attenuation, and so on. And, in UT results even for defect-free area of austenitic weld metal, echoes originated from root, columnar structure and interface between weld metal and base metal are observed with some continual variation throughout weld line. UT simulation is a very useful technique for understanding the phenomena in the ultrasonic wave ...
英字タイトル:
Simulation of UT signal for columnar structure of weld metal of stainless steel piping
第9回
ねじりモードガイド波によるエルボ部の減肉の最適計測手法
著者:
古川 敬,Takashi FURUKAWA,西野 秀郎,Hideo NISHINO
発刊日:
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This paper presents an application of numerical simulation for ultrasonic guided wave in piping with elbow. A displacement field of torsion al guided waves in elbow and piping beyond elbow was computed using three-dimensional finite element models. We tried to utilize the predic ted displacement field to optimize the measurement condition or estimation of defect detectability. Experimental validation was carried our using artificial defects in elbow and beyond elbow region. Good agreement was obtained bet...
英字タイトル:
Optimum measurements for pipe wall thinning in an elbow using torsional guided waves
第10回
ねじりモードガイド波を用いた複数のエルボ越え探傷の数値解析
著者:
古川 敬,Takashi FURUKAWA,山本 敏弘,Toshihiro YAMAMOTO,金原 了二,Ryouji KANEHARA,池田 隆,Takashi IKEDA
発刊日:
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Abstract Ultrasonic guided waves have been widely applied to the long-range inspection of straight piping. Guided waves have many wave modes with different sound velocity. So, ultrasonic testing beyond welds and elbows is very difficult to interpret testing data. This paper reports the simulation and visualization of guided wave propagation via a large-scale 3D FEM code, which has over one billion elements and parallel computing system. The prediction of torsional guided wave propagation and reflected ...
英字タイトル:
Numerical simulation of torsional-mode guided wave inspection beyond elbows
第10回
ガイド波によるエルボ部LDI及びFACを最適に検出する方法に関する検討
著者:
高松 尚平,Shohei TAKAMATSU,西野 秀郎,Hideo NISHINO,古川 敬,Takashi FURUKAWA
発刊日:
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Health monitoring of piping is one of the important issues to maintain its integrity.The guided wave monitoring is one of the promising methods r the health monitoring of piping.In this report,the optimum conditions of the guided wave method for both the flow-accelerated corrosion (FAC) and erosion of liquid droplet impingement (LDI) at around the elbow part of the piping were proposed and evaluated.The reason of the optimum con ditions was first explained and the experimental verifications were shown.Nume...
英字タイトル:
On optimum detections of both LDI and FAC on an elbow part of piping by guided waves
第14回
ショットピーニング時の残留応力緩和挙動に関する検討
著者:
木谷 悠二,Yuji KITANI,柴原 正和,Masakazu SHIBAHARA,生島 一樹,Kazuki IKUSHIMA,山田 祐介,Yusuke YAMADA,西川 聡,Satoru NISHIKAWA,古川 敬,Takashi FURUKAWA,秋田 貢一,Koichi AKITA,鈴木 裕士,Hiroshi SUZUKI,諸岡 聡,Satoshi MOROOKA
発刊日:
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キーワードタグ:
In nuclear power plants, surface treatment including the shot peening is carried out after welding for the prevention of stress corrosion cracking. In this research, the authors developed evaluation systems of the persistence of compressive residual stresses due to shot peening based on the Idealized Explicit FEM which can conduct large-scale non-linear structure analyses in realistic computing time. The developed evaluation system was applied to the analysis of the compressive residual stress due to sho...
英字タイトル:
Study of behaver to relieve residual stress at the time of the shot peening
論文
ステンレス鋳鋼配管における超音波伝播シミュレーション
著者:
坂本 一信,Kazunobu SAKAMOTO,古川 敬,Takashi FURUKAWA,古村 一朗,Ichiro KOMURA,上山 芳教,Yoshinori KAMIYAMA,三原 毅,Tsuyoshi MIHARA
発刊日:
公開日:
キーワードタグ:
It is well known that volumetric inspection by ultrasonic testing for cast austenitic stainless steel (CASS) piping, which is extensively used in primary loop of Japanese pressurized water reactors (PWR), is challenging due to unexpected beam skewing, dispersion and attenuation by its coarse and anisotropic crystal structures resulted from manufacturing process. The miss or false calling of the flaws and the deterioration of sizing performance are of great concerns in the ultrasonic testing for the ma...
英字タイトル:
Simulation of Ultrasonic Wave Propagation in Cast Austenitic Stainless Steel Piping
第13回
フェーズドアレイUTによる溶接部探傷試験条件の最適化
著者:
古川 敬,Takashi FURUKAWA,上山 芳教,Yoshinori KAMIYAMA
発刊日:
公開日:
An ultrasonic phased array technique has many advantages over conventional ultrasonic testing method. The phased array will eventually replace conventional ultrasonic NDT methods. However, the transition to phased array has several challenges. In this paper, phased array and conventional ultrasonic angle beam technique were compared under the aspect of weld testing. The detection and length sizing results of both methods for carbon steel butt welds were equivalent. Keywords: Phased array, Ultrasonic Test...
英字タイトル:
Optimization of testing conditions for phased ultrasonic UT of welds
第12回
凝固シミュレーション技術を活用した異材継手部の 超音波探傷シミュレーション
著者:
古川 敬,Takashi FURUKAWA,上山 芳教,Yoshinori KAMIYAMA,水野 亮二,Ryoji MIZUNO
発刊日:
公開日:
キーワードタグ:
Abstract Ultrasonic testing (UT) is the most appropriate non-destructive testing because of capabilities for detection and depth sizing of flaw. But it is generally said that the flaw detection in austenitic weld is difficult because of dispersion and attenuation of the ultrasonic wave.UT simulation is a very useful technique for understanding the phenomena in the propagation of ultrasonic wave and for evaluating the UT results.On UT simulation for weld used austenitic welding material, modeling of co...
英字タイトル:
UT simulation of dissimilar metal weld joint utilizing solidification simulation technique
論文
原子炉再循環系配管のSCC深さサイジング技術
著者:
古川 敬,Takashi FURUKAWA,古村 一朗,Ichiro KOMURA,山下 裕宣,Hironobu YAMASHITA,徳間 英昭,Hideaki TOKUMA,福田 俊彦,Toshihiko FUKUDA
発刊日:
公開日:
1.はじめに国内の沸騰水型原子力発電設備の再循環系配管(以下PLR配管と記す)で使用されている低炭素オーステナイト系ステンレス鋼(以下SUS316L系材と記す)配 管の一部でひび割れが発見され、超音波探傷試験(以下UTと記す)による深さ測定が行われた。この測定に用いられたUT手法は、横波を用いた端部エコー法(以下従来UTと呼ぶ)を適用した。その後の金属調査の結果、ひび割れは応力腐食割れ(Stress CorrosionCracking 以下SCCと記す)であることが判明した。また従来UTで測定したひび割れ......