• Title/Summary/Keyword: TACK

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Behavior of FRP bonded to steel under freeze thaw cycles

  • Toufigh, Vahab;Toufigh, Vahid;Saadatmanesh, Hamid
    • Steel and Composite Structures
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    • v.14 no.1
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    • pp.41-55
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    • 2013

  • Fiber reinforced polymers (FRP) materials are increasingly being used for strengthening and repair of steel structures. An issue that concerns engineers in steel members which are retrofitted with FRP is stress experienced due to temperature changes. The changing temperature affects the interface bond between the FRP and Steel. This research focused on the effects of cyclical thermal loadings on the interface properties of FRP bounded to steel members. Over fifty tests were conducted to investigate the thermal effects on bonding between FRP and steel, which were cycled from temperature of $-11^{\circ}C$ ($12^{\circ}F$) to $60^{\circ}C$ ($140^{\circ}F$) for 21-36 days. This investigation consisted of two test protocols, 1) the tensile test of epoxy resin, tack coat, FRP and FRP-steel plate, 2) tensile test of each FRP compound and FRP with steel after going through thermal cyclic loading. This investigation reveals an extensive reduction in the composite's strength.

  • https://doi.org/10.12989/scs.2013.14.1.041 인용 KSCI

The Local Surface Strength Variation of Coated Papers during Printing (인쇄과정에서 코팅 용지의 국부적인 표면강도 변화에 관한 연구)

  • Youn, Jong-Tae
    • Journal of the Korean Graphic Arts Communication Society
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    • v.22 no.2
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    • pp.101-110
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    • 2004

  • The local surface strength variation of coated papers were measured at various speeds on a number of coated paper samples to study the effects of speed and ink tack on coating pick. Coating pick phenomenon is observed in an ink transfer variation curve as a decrease in the slope of the curve. On the other hand, it causes an actual decrease in net ink transfer to paper with an increase in speed. The effect of speed on coating pick depends on ink tack, ink film thickness and surface properties of coating layer formation of paper. A novel device to measure the surface strength can rate the coating paper in a different order. Comparison are made between dry test of coating paper pick and wet coating pick test of printing in IGT printability tester. Coating formulation is the main key to prevent from coating pick. The binder level increases, the coating pick and the slop decrease. The piling on blanket in printing is a problem when the coating pick is occur on a local area rather than average surface strength of coated papers.

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