著者

稲男 洋一 佐伯 尚哉 杉崎 俊夫 清水 雅司 因幡 和晃 岸本 喜久雄

出版者

一般社団法人 日本接着学会

雑誌

日本接着学会誌 (ISSN:09164812)

巻号頁・発行日

vol.48, no.9, pp.308-313, 2012-09-01 (Released:2014-06-30)

参考文献数

33

被引用文献数

2

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粘着剤を2種の剥離フィルムで挟まれた構造の基材レス粘着シートは,耐溶剤性,耐熱性に劣るフィルムに,粘着剤のみがシート化され貼り合わせることが出来るため,テレビや携帯電話に代表されるディスプしイを製造する際の偏光板等とガラスを積層するために使用されている。粘着剤と剥離剤を剥離する剥離力は,粘着剤種により変動するため,弾性率を変化させた粘着剤を用いた基材レス粘着シートにおいて,剥離角度や剥離速度の条件を変動させ剥離力を測定した。その結果より,粘着剤と剥離剤の界面の剥離エネルギを解析した。また,剥離角度を変更した条件で剥離先端部の可視化を光学顕微鏡で行うことで,剥離時の粘着剤の変形を観察した。これらの結果を併せることで,粘着剤の弾性率の違いによる剥離のメカニズムを予測した。

著者

森重 直樹 TRIAWAN Farid 因幡 和晃 岸本 喜久雄

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.83, no.855, pp.17-00304-17-00304, 2017 (Released:2017-11-25)

参考文献数

13

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A zirconium alloy cylindrical tube exhibited fracture under high-velocity axial impact load when high yield strength pellets were inserted as reported by Morishige et al., 2016. The fracture occurred after a crack was initiated at the tensile side of the bending tube. In this paper, FE analyses were conducted to clarify the fracture mechanism as well as the deformation behavior. At first, axial tensile tests using tubes with four slit-holes located at the center were performed in order to evaluate the fracture behavior of the tube. Then, digital image correlation (DIC) method was utilized to measure the local strain near the slit-holes. The results showed that the fracture displacement became smaller with smaller slit-holes’ radius. Also, the strain was concentrated at the slit-holes’ tips where cracks were generated before fracture. Subsequently, FE analyses of the tensile tests were conducted by LS-DYNA using the implicit method to obtain the fracture criterion. The load-displacement curve agreed well with the experiment. Then, the relationship between stress triaxiality and equivalent plastic strain near the slit-holes’ area were evaluated to define the fracture criterion. Finally, FE analyses of the axial impact tests using the dynamic explicit method were conducted to compare with the fracture criterion defined by the axial tensile tests. The results indicated that a localized stress and strain might occur at the tube boundary adjacent to pellets. This was caused by the interaction between tube and pellets’ edge which generated a tensile stress condition at the tube boundary when high yield strength pellet was applied. Under this condition, both stress triaxiality and effective plastic strain could increase and eventually lead to the fracture criterion.