茨城大学
名誉教授
(工学部)

名誉教授

鴻巣 眞二

コウノス シンジ
KONOSU Shinji

学歴

  1. 東北大学 工学部 機械工学 1970
  2. 東北大学 工学研究科 機械工学 1975

学位

  1. 工学博士 東北大学

教育・研究活動状況

装置構造体の健全性評価

研究分野

  1. 材料強度

研究テーマ

  1. 構造の安全性評価

著書

  1. 圧力機器のき裂状欠陥評価方法-第2段階評価HPIS Z101-2 日本高圧力技術協会 2011/09
  2. 超高圧ガス設備に関する基準KHKS 0220 高圧ガス保安協会 2010/02
  3. 高圧ガス設備の供用適性評価に基づく耐圧性能及び強度に係る次回検査時期設定基準KHK/PAJ/JPCA S0851 高圧ガス保安協会 2009/10
  4. 圧力機器のき裂状欠陥評価方法-第1段階評価HPIS Z101-1 日本高圧力技術協会 2008/09
  5. 圧力機器の外面腐食に対する評価規格 茨城県高圧ガス保安協会 2006/06

論文

  1. 研究論文(国際会議プロシーディングス) 共著 EVALUATION OF THE INTERNAL HYDROGEN-INDUCED THRESHOLD STRESS INTENSITY FACTOR IN 2.25CR-1MO STEELS DETERMINED BY THE OFFSET POTENTIAL DROP METHOD Shinji Konosu, Takehiro Inoue and Yoshiaki Murakami Proceedings of the ASME 2017 2017 ASME Pressure Vessels & Piping Division Conference ASME PVP2017/ 65505, 1-13 2017/07 10.1115/PVP2017-65505
  2. 研究論文(国際会議プロシーディングス) 共著 Threshold for Hydrogen-Induced Fracture in 2.25Cr-1Mo Steel Used for Long-Term Service Hiroki Nakanishi, Wataru Fujiki, Hiroaki Ohtani and Shinji Konosu Proceedings of the ASME 2016 Pressrure Vessels & Piping Division Conference PVP2016, July 17-21, 2016, Vancouver Canada 63403 2016/07
  3. 研究論文(学術雑誌) 共著 Tearing Resistance Properties of Cr-Mo Steels with Internal Hydrogen Determined by the Potential Drop Method SHINJI KONOSU, HIDENORI SHIMAZU, and RYOHEI FUKUDA METALLURGICAL AND MATERIALS TRANSACTIONS A 46A, 5626-5637 2015/11 10.1007/s11661-015-3145-4 The tearing resistance, dJ/da, of conventional 2.25Cr-1Mo steels and a V-bearing steel(2.25Cr-1Mo-0.3V steel) with internal hydrogen was measured using the effective offset potential drop method. Internal hydrogen refers to test specimens that are precharged (thermally charged)prior to testing. In general, Cr-Mo steels, used widely in the refining and petrochemical industries, are susceptible to temper embrittlement. However, very few studies have dealt with the effects of hydrogen and temper embrittlement on the tearing resistance. Test specimens were prepared by subjecting them to normalizing, tempering, and post-weld heat treatments that simulated actual conditions. Some specimens were embrittled by step cooling. Hydrogen substantially reduced dJ/da for all samples except for that for the V-bearing steel, and temper embrittlement caused additional adverse effects on dJ/da for samples with internal hydrogen for which the temper embrittlement parameter, i.e., the J-factor, was large.
  4. 研究論文(国際会議プロシーディングス) 共著 VALIDITY OF PROCEDURE FOR PLASTIC COLLAPSE ASSESSMENT OF A LOCAL THIN AREA NEAR VESSEL AND NOZZLE INTERSECTIONS SUBJECTED TO INTERNAL PRESSURE AND EXTERNAL LOADINGS Kenji Oyamada, Shinji Konosu, Tetsuji Miyashita and Takashi Ohno Proceedings of the ASME 2015 Pressure Vessels & Piping Conference PVP2015 PVP2015-45512 2015/07/21 10.1115/PVP2015-45512 There are numerous cases in which a volumetric flaw such as a local thin area (LTA) is found in pressure equipment such as vessels, piping, tanks, and so on. Sometimes it is found near vessel and nozzle intersection. A fitness for service (FFS) rule of such cases was desired, because plastic collapse assessment of LTA near vessel and nozzle intersection usually needed to conduct by numerical analysis such as FEA. Recently, an FFS assessment rule of plastic collapse assessment of LTA near vessel (run-pipe) and nozzle (branch pipe) intersection subjected to internal pressure and external loadings has been developed and proposed by one of authors of this paper. In this paper, the proposed plastic collapse assessment rule was verified with results of experiments and FEA for cylindrical vessels with an LTA near vessel and nozzle intersections subjected to internal pressure and external loadings.
  5. 研究論文(国際会議プロシーディングス) 共著 Procedure for Plastic Collapse Assessment of a Local Thin Area near Vessel and Nozzle Intersections Subjected to Internal Pressure and External Loadings Shinji Konosu, Kenta Ogasawara and Kenji Oyamada Proceedings of the ASME 2015 Pressure Vessels & Piping Division Conference PVP2015 PVP2015-45538 2015/07/21 10.1115/PVP2015-45538 This paper develops a procedure for plastic collapse assessment of vessel (run pipe) - nozzle (branch pipe) intersections with an arbitrarily positioned local thin area (LTA) under different loading conditions, namely internal pressure, external moment on a nozzle applied along various directions with respect to the vessel main axis, and pure bending moment on a vessel. Although simplified procedures for plastic collapse assessment based on the p-M (internal pressure ratio and external bending moment ratio) diagram method have been previously proposed for straight cylindrical vessels and pipe bends with an LTA, very few studies have dealt with the determination of plastic collapse load for an LTA in the critical region of intersecting vessels subjected to internal pressure and external moment loading. This is likely due to the complexity of the stresses caused by the applied loads in the critical region, which arises from geometric discontinuities. In this paper, simple and empirical formulae for predicting conservative plastic collapse loads for an LTA in the critical region of the intersecting vessels are proposed based on the analytical results of stresses at defect-free vesselnozzle intersections by using linear finite element analysis (FEA). Localized elastic stress retardation factors are taken into account in the evaluation by the results of a non-linear FEA. Consequently, a p-M diagram method is developed for application to vessel-nozzle intersections with an LTA.

研究発表

  1. 口頭発表(一般) 鋼の水素脆化割れ下限界応力拡大係数 KIH 日本高圧力技術委員会秋季講演会 2013/12/05
  2. 口頭発表(一般) Procedure for Predicting Multiple Noaligned Fatigue Crack Life Internationa Conference on Fracture and Strength, ICFS2010 2010/10/03
  3. 口頭発表(一般) Overview of on-going FFS rules in Japan for general industrial facilities(Invited lecture) Eueopean Fitbess-for-Service Network, 8th Meeting 2005/09 Invided lecture
  4. 口頭発表(一般) Cr-Mo鋼の衝撃特性に及ぼす焼戻脆化と水素脆化の重畳作用 日本鉄鋼協会秋季講演会 2005/09/28
  5. 口頭発表(一般) 局部減肉容器の参照応力による評価 日本機械学会 日立講演会 2005/09/09

知的財産権

  1. 特許 ベローズの劣化検査方法 特願2006-000248 2006/01/04 2011/03/25

受賞

  1. 日本高圧力技術協会 特別功労賞 2013/05/24
  2. 高圧ガス保安協会会長表彰 保安功労者 2010/10/29
  3. 日本高圧力技術協会 貢献賞 2008/05/30

所属学協会

  1. The American Society of Mechanical Engineers (ASME)
  2. 日本高圧力技術協会
  3. 日本溶接協会 化学機械溶接研究委員会
  4. 日本学術振興会先端材料強度第129委員会(高温強度小委員会)
  5. 日本材料強度学会