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Shear Strength of an Aluminum Alloy Bonded with a DP-460 Adhesive: Single Lap-shear Joints
( Hyun-bum Kim ),( Tomohisa Nishida ),( Hiroyuki Oguma ),( Kimiyoshi Naito ) 한국접착및계면학회 2020 접착 및 계면 Vol.21 No.1
Single lap-shear joints (SLJ) specimens with and without partial round fillets were fabricated to measure the average shear strength of adhesives. The effects of the length of the adherend on the SLJ specimens were also investigated. An epoxy adhesive was used to bond aluminum alloy. Tensile tests were performed on the adhesive bulk specimens to measure the mechanical properties. The finite element analysis (FEA) method was used to measure the adhesive stress distributions, i.e., the peel and shear stresses, on the bonded part. The experimental results revealed that the specimen consisting short length of adherend and without the partial round fillets exhibited the smallest average shear strength of adhesive among the investigated specimens. FEA revealed that the low average shear strength for the specimen with a short adherend length was caused by high stress concentrations on the adhesive at the edge of the bonded part.
An integrated approach to tropical and subtropical island conservation
Yamano, Hiroya,Satake, Kiyoshi,Inoue, Tomomi,Kadoya, Taku,Hayashi, Seiji,Kinjo, Koichi,Nakajima, Daisuke,Oguma, Hiroyuki,Ishiguro, Satoshi,Okagawa, Azusa,Suga, Shinsuke,Horie, Tetsuya,Nohara, Katsuhit The Ecological Society of Korea 2015 Journal of Ecology and Environment Vol.38 No.2
After the reversion of Okinawa (Ryukyu Islands) to Japan in 1972, extensive urban and agricultural development resulted in a significant increase in sediment discharge to coastal waters. The release of sediment has caused the degradation of freshwater and coastal ecosystems and biodiversity. A consideration for catchment-to-reef continua, as well as agricultural (socioeconomic) factors is necessary to establish proper land-based management plans for the conservation of the island environment. We have set up a framework to integrate biophysics and socioeconomics: 1) setting a conservation target and threshold, 2) identifying the sources and processes, and 3) examining cost-effectiveness and management priorities. The framework may be applicable to other tropical and subtropical islands with similar characteristics.
An integrated approach to tropical and subtropical island conservation
Hiroya Yamano,Kiyoshi Satake,Tomomi Inoue,Taku Kadoya,Seiji Hayashi,Koichi Kinjo,Daisuke Nakajima,Hiroyuki Oguma,Satoshi Ishiguro,Azusa Okagawa,Shinsuke Suga,Tetsuya Horie,Katsuhito Nohara,Naoko Fukay 한국생태학회 2015 Journal of Ecology and Environment Vol.38 No.2
After the reversion of Okinawa (Ryukyu Islands) to Japan in 1972, extensive urban and agricultural development resulted in a significant increase in sediment discharge to coastal waters. The release of sediment has caused the degradation of freshwater and coastal ecosystems and biodiversity. A consideration for catchment-to-reef continua, as well as agricul¬tural (socioeconomic) factors is necessary to establish proper land-based management plans for the conservation of the island environment. We have set up a framework to integrate biophysics and socioeconomics: 1) setting a conservation target and threshold, 2) identifying the sources and processes, and 3) examining cost-effectiveness and management pri¬orities. The framework may be applicable to other tropical and subtropical islands with similar characteristics.