著者

上原 拓也 井上 達雄

出版者

公益社団法人 日本材料学会

雑誌

材料 (ISSN:05145163)

巻号頁・発行日

vol.44, no.498, pp.309-315, 1995-03-15 (Released:2009-06-03)

参考文献数

19

被引用文献数

4 9

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The quenching process of a Japanese sword is simulated by a CAE system “HEARTS” developed by one of the authors. The system is available to consider the coupling effect among metallurgical change due to phase transformation, temperature and inelastic stress/strain.In the quenching process of the Japanese sword, a special kind of clay is pasted on the surface to control the heat transfer coefficient between metal and water. The dependence of the coefficient on the thickness of clay and also the surface temperature is experimentally evaluated first by using a cylindrical rod of silver. The results show a relatively higher value with thin-pasted clay than that without clay at a high temperature range. The data are then applied to simulate the variation of temperature coupled with the structural change from austenite to martensite and pearlite as well as the variation of stress. It gives an attractive result that the sword is bent two times to the direction opposite to the normal shape due to the complicated time difference between martensitic and pearlitic transformation and thermal contraction. The simulated results of residual stress distributions are compared with the measured data by X-ray diffraction technique.

著者

井上 達雄 上原 拓也 後藤 勉

出版者

社団法人日本材料学会

雑誌

学術講演会講演論文集

巻号頁・発行日

vol.49, pp.337-338, 2000

著者

上原 拓也 角田 渓太 隅 寿恵 山内 周 望月 秀樹 中 隆

出版者

日本神経学会

雑誌

臨床神経学 (ISSN:0009918X)

巻号頁・発行日

vol.56, no.11, pp.777-780, 2016 (Released:2016-11-29)

参考文献数

7

被引用文献数

7 6

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症例は47歳女性.母親が原因不明の多臓器不全.4年前から両下肢の痺れ感が出現し,起立時に失神した.徐々に失神回数が増え下痢と便秘を繰り返すようになった.診察上,下肢優位感覚優位の末梢神経障害と高度な自律神経障害を認めた.心筋生検にてアミロイド沈着とトランスサイレチン遺伝子変異(Gly47Arg; G47R)が判明したが,多臓器不全のため積極的な治療は行えなかった.数か月にわたって徐々に意識が低下し,多臓器不全にて死亡した.解剖の結果,末梢神経系と一般臓器のみならず,クモ膜下腔および脊髄脳幹の表層に高度なアミロイド沈着を認めた.G47R変異が髄膜アミロイドーシスを引き起こすことを示した初の症例報告である.

著者

上原 拓也 井上 達雄

出版者

社団法人日本材料学会

雑誌

材料 (ISSN:05145163)

巻号頁・発行日

vol.44, no.498, pp.309-315, 1995-03-15

被引用文献数

1 9

---

The quenching process of a Japanese sword is simulated by a CAE system "HEARTS" developed by one of the authors. The system is available to consider the coupling effect among metallurgical change due to phase transformation, temperature and inelastic stress/strain. In the quenching process of the Japanese sword, a special kind of clay is pasted on the surface to control the heat transfer coefficient between metal and water. The dependence of the coefficient on the thickness of clay and also the surface temperature is experimentally evaluated first by using a cylindrical rod of silver. The results show a relatively higher value with thin-pasted clay than that without clay at a high temperature range. The data are then applied to simulate the variation of temperature coupled with the structural change from austenite to martensite and pearlite as well as the variation of stress. It gives an attractive result that the sword is bent two times to the direction opposite to the normal shape due to the complicated time difference between martensitic and pearlitic transformation and thermal contraction. The simulated results of residual stress distributions are compared with the measured data by X-ray diffraction technique.