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Effect of young's modulus of adhesive layer on fracture modes of brittle layer structures

หน่วยงาน จุฬาลงกรณ์มหาวิทยาลัย

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ชื่อเรื่อง : Effect of young's modulus of adhesive layer on fracture modes of brittle layer structures
นักวิจัย : Porntip Sakolkool
คำค้น : Brittleness , Fracture mechanics , Layer structure (Solids) , Elasticity , Ceramics , Adhesives
หน่วยงาน : จุฬาลงกรณ์มหาวิทยาลัย
ผู้ร่วมงาน : Prapaipan Chantikul , Natthaphon Wuttiphan , Chulalongkorn University. Faculty of Science
ปีพิมพ์ : 2547
อ้างอิง : 9745310301 , http://cuir.car.chula.ac.th/handle/123456789/3471
ที่มา : -
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ความสัมพันธ์ : -
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Thesis (M.Sc.)--Chulalongkorn University, 2004

An investigation is made of the role of Young's modulus of adhesive interlayer in determining fracture modes in brittle layer structures from indentation with hard spheres. A trilayer system consisting of a glass coating layer (thicknesses of 500 and 1000 micron) joined to a glass substrate (thickness of 5.8 mm) by an adhesive polymer (thicknesses of 20 and 200 micron), loaded at its coating surface with a hard tungsten carbide sphere (radius 1.59 mm), is used as a model system in this work. Steel-epoxy resin, epoxy resin and silicone sealant which have a broad range of Young's modulus are used as the three different adhesive interlayers in this work. Young's modulus measured for each of the chosen adhesive interlayer using tensile tests, indicates that the steel-epoxy resin has the highest value of Young's modulus, whereas the silicone sealant has the lowest value of Young's modulus. A bonded-interface technique together with a reflection optical microscopy is used to reveal crack profiles of the specimens due to contact with the tungsten carbide sphere. For almost all specimens of various layer geometries (different thicknesses of coating layer or adhesive interlayer) used in this work, it is found that if the contact load is sufficiently high, both the cone crack initiated at the top surface of the coating layer and the radial crack initiated at the lower surface of the coating layer are generally evident. The critical contact loads for the cone crack initiation are always found to be lower than those for the radial crack initiation. At any layer geometry, it is found that both the critical loads for cone crack and radial crack initiation are the lowest for the layer specimens with silicone sealant interlayer, and they are the highest in the layer specimens with steel-epoxy resin interlayer. Such finding is attributed to the unequal ability of the different adhesive interlayer to flex due to the contact load. The silicone sealant interlayer having lower Young's modulus can be flexed more than the steel-epoxy resin interlayer during the contact, and consequently can allow its coating layer to flex more than the coating layer of the specimen with steel-epoxy resin interlayer

บรรณานุกรม :
Porntip Sakolkool . (2547). Effect of young's modulus of adhesive layer on fracture modes of brittle layer structures.
    กรุงเทพมหานคร : จุฬาลงกรณ์มหาวิทยาลัย.
Porntip Sakolkool . 2547. "Effect of young's modulus of adhesive layer on fracture modes of brittle layer structures".
    กรุงเทพมหานคร : จุฬาลงกรณ์มหาวิทยาลัย.
Porntip Sakolkool . "Effect of young's modulus of adhesive layer on fracture modes of brittle layer structures."
    กรุงเทพมหานคร : จุฬาลงกรณ์มหาวิทยาลัย, 2547. Print.
Porntip Sakolkool . Effect of young's modulus of adhesive layer on fracture modes of brittle layer structures. กรุงเทพมหานคร : จุฬาลงกรณ์มหาวิทยาลัย; 2547.