著者

河越 正羽 水谷 義弘 轟 章 松崎 亮介 安岡 哲夫

出版者

一般社団法人 日本機械学会

雑誌

日本機械学会論文集A編 (ISSN:18848338)

巻号頁・発行日

vol.79, no.801, pp.555-562, 2013 (Released:2013-05-25)

参考文献数

27

被引用文献数

1 3

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In this study, a new welding method which utilizes conductivity of CFRTP (Carbon Fiber Reinforced Thermo-Plastic) is proposed. Electrical current is applied through the CFRTP single-lap joints in thickness direction. Since resistance of joining surface is the highest in the current path, the joining surface is preferentially heated by Joule heating. In this study, spot welding and surface welding were conducted. By applying constant voltage of 5.0V or 10.3V, the joint-surfaces were heated above melting temperature Tm of the material and were welded. In order to evaluate lap-shear strength (LSS) of welded joints, tensile lap-shear strength tests were conducted. As a result, the tensile lap-shear true stress of spot welding is 31.0MPa and LSS of surface welding is 22.0MPa. These strengths were comparable to those that were welded by traditional resistance welding method. It is also found that LSS is changed with welding pressure of joint parts.

著者

長澤 純人 水谷 義弘 長澤 純人 水谷 義弘

出版者

一般社団法人日本機械学会

雑誌

日本機械学會誌 (ISSN:00214728)

巻号頁・発行日

vol.100, no.940, pp.284-286, 1997-03-05

著者

轟 章 大浅田 樹 水谷 義弘 鈴木 良郎 上田 政人 松崎 亮介 平野 義鎭

出版者

一般社団法人 日本複合材料学会

雑誌

日本複合材料学会誌 (ISSN:03852563)

巻号頁・発行日

vol.45, no.4, pp.141-148, 2019-07-15 (Released:2020-07-29)

参考文献数

11

被引用文献数

1

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Continuous carbon fiber composites can be printed with 3D printers. Many studies detailing elucidations of the mechanical properties of such 3D printed composites have been published, all of which employed a conventional tensile specimen configuration with surface resin layers. In the present study, 0º, 90º, ±45º, and lay-up direction type specimens were newly designed for 3D printed composites without surface layers. Using the 3D printer, both conventional and newly designed specimens with serpentine folded fiber bundles were fabricated and investigated experimentally. The lay-up direction specimen was fabricated using 800 layers. The specimens without the serpentine folded fiber bundles were experimentally shown to be adequate for tensile tests. The lay-up direction specimen had the lowest strength and stiffness, which seems to be related to its surface roughness.

著者

東海林 一 水谷 義弘 葭田 貴子

出版者

一般社団法人 日本機械学会

雑誌

日本機械学会論文集 (ISSN:21879761)

巻号頁・発行日

vol.84, no.858, pp.17-00452-17-00452, 2018 (Released:2018-02-25)

参考文献数

10

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Generally in Japan, high skilled UT engineer performed examination and high reliability of examination results are achieved. However, it is not confirmed how high skill and actual probability of detection (POD). In the performance demonstration (PD) system in US, there are determined that the number of defect, minimum number of detection, number of unflawed area and allowable false detection, but it is not considered the defect size. In this study, based on the signal detection theory, the actual POD was estimated by the signal amplitude (defect size) and observed reflection position of field experience data. It was confirmed that the POD is decreased with a less than 3.2 mm depth. The estimated POD for each crack depth well matches the result of laboratory experience data. The probability of failure for piping system was calculated based on this estimated POD, it was lower than 10-7 in case of stress corrosion cracking (SCC) on low carbon stainless steel piping SCC, and it was lower than 10-3 in case of SCC on sensitized stainless steel 304. In order to keep the probability of failure is 10-3 or less, it is only necessary that the POD is 0.95 or greater for large crack as 3.2 mm depth or more. Based on these result, this paper proposed the acceptance criteria for qualification test as training graduation.

著者

水谷 義弘 片桐 幸徳 多田隈 建二郎

出版者

一般社団法人日本機械学会

雑誌

日本機械学會誌 (ISSN:00214728)

巻号頁・発行日

vol.117, no.1142, pp.51-52, 2014-01-05

著者

上野谷 敏之 水谷 義弘

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.55, no.3, pp.341-347, 2006 (Released:2006-04-26)

参考文献数

50

被引用文献数

1