著者

諏訪 晴彦 川野 常夫 久保 司郎 丸山 隆三

出版者

公益社団法人 日本工学教育協会

雑誌

工学教育研究講演会講演論文集 第63回年次大会(平成27年度) (ISSN:21898928)

巻号頁・発行日

pp.116-117, 2015 (Released:2016-12-29)

著者

諏訪 晴彦 川野 常夫 久保 司郎 丸山 隆三

出版者

公益社団法人日本工学教育協会

雑誌

工学教育研究講演会講演論文集

巻号頁・発行日

vol.27, no.63, pp.116-117, 2015-08-07

著者

久保 司郎

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.41, no.470, pp.1595-1604, 1992-11-15 (Released:2009-06-03)

参考文献数

72

被引用文献数

4

著者

諏訪 晴彦 川野 常夫 久保 司郎 長谷川 淳

出版者

公益社団法人 日本工学教育協会

雑誌

工学教育研究講演会講演論文集 第64回年次大会(平成28年度) (ISSN:21898928)

巻号頁・発行日

pp.74-75, 2016 (Released:2016-12-14)

著者

阪上 隆英 久保 司郎 原 文人 番匠谷 隆

出版者

日本実験力学会

雑誌

実験力学 (ISSN:13464930)

巻号頁・発行日

vol.1, no.1, pp.34-38, 2001 (Released:2010-03-19)

参考文献数

5

---

Thermographic NDT technique using an active thermal stimulation method was applied for the detection of delamination defects in concrete structures. An oil heater, which can apply heat flux to the objective body by radiation and convection heat transfer, was employed for active heating. Evaporation cooling by water spray was used for active cooling. Preliminary experimental investigations were carried out for concrete specimens with artificial delamination defects. It was found that delamination defects can be detected from the thermal images, in which localized high or low temperature regions appeared above the delamination defects. Proposed technique was applied for the inspection of actual delamination defects in the concrete railway bridges. It was found that the defect shape was clearly estimated from the localized temperature region appeared in thermal images under active thermal stimulation.

著者

久保 司郎

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.32, no.362, pp.1285-1291, 1983-11-15

被引用文献数

1

著者

久保 司郎

出版者

一般社団法人 日本応用数理学会

雑誌

応用数理 (ISSN:24321982)

巻号頁・発行日

vol.16, no.1, pp.45-52, 2006-03-28 (Released:2017-04-08)

参考文献数

23

著者

金 連姫 井岡 誠司 久保 司郎

出版者

一般社団法人 日本機械学会

雑誌

関西支部講演会講演論文集 2010.85 (ISSN:24242756)

巻号頁・発行日

pp._3-23_, 2010-03-16 (Released:2017-06-19)

著者

汐月 資純 久保 司郎 楠部 寛和

出版者

一般社団法人 日本機械学会

雑誌

計算力学講演会講演論文集 2002.15 (ISSN:24242799)

巻号頁・発行日

pp.393-394, 2002-10-30 (Released:2017-06-19)

著者

久保 司郎

雑誌

摂南大学 融合科学研究所論文集 = Bulletin of the Transdisciplinary Science Research Institute, Setsunan University (ISSN:24325031)

巻号頁・発行日

vol.2, no.1, pp.121-128, 2016-10-31

---

Inverse problems deal with identification, estimation, monitoring from observations or measurements. In this paper the role and importance of inverse problems are described. The definition and classification of inverse problems are presented. Inverse analyses are ill-posed in nature. To overcome the ill-posedness the importance of information to be used in the inverse analyses and regularization is described. Examples of inverse problems treated by the present author are presented.

著者

井岡 誠司 荒川 貴裕 久保 司郎

出版者

一般社団法人日本機械学会

雑誌

年次大会講演論文集 : JSME annual meeting

巻号頁・発行日

vol.2006, no.6, pp.177-178, 2006-09-15

---

The free-edge stress singularity usually develops near the edge of the interface of the bonded dissimilar materials. Anisotropic materials may be used for making bonded dissimilar materials. When two materials are bonded, an interlayer, for example an adhesive layer, may be inserted between two materials. In this study, free-edge stress singularity of bonded dissimilar orthotropic materials with an interlayer was investigated by using the boundary element method. It was found that the influence of the interlayer on the stress distribution on interface was limited in the region of the order of the interlayer thickness around the edge of interface similar to the bonded dissimilar isotropic materials. Free-edge stress singularity disappeared by inserting a proper materials between the bonded dissimilar materials.

著者

久保 司郎 井岡 誠司

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.46, pp.109-110, 1997

著者

大路 清嗣 中井 善一 塩谷 昇史 久保 司郎 Kacou P.A.T. 根岸 聖司

出版者

社団法人日本材料学会

雑誌

学術講演会前刷

巻号頁・発行日

vol.41, pp.25-27, 1992-05-22

著者

大路 清嗣 辻 昌宏 久保 司郎 小野 嘉雄 八幡 篤 梅井 健司

出版者

一般社団法人日本機械学会

雑誌

日本機械学會論文集. A編 (ISSN:03875008)

巻号頁・発行日

vol.59, no.562, pp.1429-1436, 1993-06-25

被引用文献数

7 11

---

A criterion was sought for predicting the path of a fatigue crack in HT80 steel propagating in residual stress fields. The problem was investigated with respect to two questions : (I) which was the dominant factor in determining the fatigue crack path, the cyclic components or the maximum values of stress intensity factors (SIFs), and (II) what kind of criteria, expressed in terms of the foregoing dominant SIF parameter, could be used for predicting the fatigue crack path ? For the first question, it was indicated that the cyclic components of SIFs determined the crack path. For the second question, it was found that the crack path could be predicted by applying the Δσ_θ maximum criterion, which predicted that the crack propagated in the direction of the maximum range of circumferential stress component. Crack propagation lives for cracks curved due to the existence of a hole were calculated by applying the "U- (crack opening ratio) estimation" method based on the superposition principle proposed by the present authors. The predicted lives were in good agreement with the experimental results.

著者

久保 司郎 大中 幸三郎 大路 清嗣

出版者

一般社団法人日本機械学会

雑誌

日本機械学會論文集. A編 (ISSN:03875008)

巻号頁・発行日

vol.60, no.575, pp.1638-1643, 1994-07-25

---

The present authors proposed the adjoint boundary integral method for identifying heat source or force in a domain from values of boundary integrals involving an adjoint operator. The integrals can be evaluated if boundary values are available over the entire boundary of the domain. In the present study a Poisson field source is identified from noisy and discrete boundary observations by applying the method. Adaptive Gauss quadrature enables evaluation of the boundary integrals from observations at discrete points, which deviate from the Gauss points for approximate evaluation of boundary integrals. Numerical simulations are carried out for identifying location and intensity of a concentrated source in a two-dimensional domain. Effects of errors in boundary observations, deviation of locations of observation points from the Gauss points, the order of Gauss quadrature, and the location of source on the accuracy of the identification are discussed. It is shown that the location and intensity of the source can be estimated reasonably from noisy and discrete observations by applying the adjoint boundary integral method with the adaptive Gauss quadrature.