著者

岡本 佳之 高柳 毅 釣谷 浩之 佐山 利彦 上杉 健太朗 星野 真人 長瀬 達則 森 孝男

出版者

公益財団法人 高輝度光科学研究センター

雑誌

SPring-8/SACLA利用研究成果集 (ISSN:21876886)

巻号頁・発行日

vol.3, no.2, pp.497-501, 2015-07-21 (Released:2021-01-15)

参考文献数

3

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SPring-8における放射光光源を利用したX線マイクロCT装置(SP-μCT)を用い、フリップチップのSn-Ag-Cu鉛フリーはんだ接合部を対象として、デジタル画像相関法による、ひずみ分布の非破壊計測の可能性について検証を行った。ひずみ計測の前段階として、変位ベクトルの粗探索を行った結果、Ag3Sn相のような特徴点の周囲では、比較的高い精度で、ひずみ計測を行うことができる見通しが得られた。今後、追加の実験を行うことでマイクロ接合部における新たな信頼性手法の開発が期待できる。

著者

林 達規 森 孝男

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.2008, no.1, pp.91-92, 2008-08-02

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The role of a pressure sensor is to display pressure definitely for at least 2000 hours. However, a residual strain after reloading occurs in the diaphragm using in the high-pressure. This study involved a finite element analysis of the sensor. As the result of the analysis, the residual strain was improved by making the thickness of diaphragm thicker. However, it is thought that the sensitivity of a sensor may become poor. Therefore, it is important to reduce the force by optimizing the structure. Measurement accuracy and durability is required of high-pressure equipment. Therefore, it is important with the diaphragm type pressure sensor to examine the influence that shape and the size of diaphragm exert on the measurement accuracy and durability. As a first step, the diaphragm size was clarified. A finite element method (FEM) based on the experimental design was used. And, to optimize the size of the diaphragm, each part was examined by clarifying the stress and warp distributions.

著者

柏村 孝義 森 孝男 白鳥 正樹 于 強 丸山 修

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.62, no.603, pp.2422-2427, 1996-11-25

被引用文献数

14 2

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The authors proposed a new practical optimum design method (=statistical optimization method) that consists of two steps of an effectivity analysis (using a combination of the design of experiments and the structural analysis) and mathematical programming. The design of experiments is used to generate the approximate evaluation functions for the controlling behavior depending on the changes of design variables of the object structure, using finite element analysis (FEA). The evaluation functions can also be used as tools for directly estimating the behavior of the designed structure. A successive quadratic programming (SQP) method is employed to solve the optimization problem of the approximate evaluation functions. It is confirmed that the proposed method call be used in solving various problems. In this study, the authors applied the present method to the optimum design of a frame column subjected to axial crushing. This study deals with many complex behaviors such as large deformation, contact and material nonlinearities as well as impact behavior. However, this problem has been solved easily using the present method, and satisfactory results of the effectivity analysis and optimum design are obtained.統計的最適化手法を用いて,複雑な非線形現象である動的圧潰現象における最適化および影響度解析を行った.応答曲面を用いた本手法では,複雑な非線形挙動を再現する高精度な推定式を得ることができるとともに最適化計算においても高い精度を有することが確認できた.