Strength Analysis of a Rib-Stiffened GLARE-Based Thin-Walled Structure

Strength Analysis of a Rib-Stiffened GLARE-Based Thin-Walled Structure

This paper presents a new product, glass epoxy laminate reinforced aluminum (glare) -based thin-walled structures with stiffeners in the form of longitudinal ribs. The ribs rigid outer metal layer of the glare-based panels made with extra sheet forming techniques and alclad 2024-T3 alloy aluminum sheet used as adherends. The strength properties of adhesive joints between the layers of metal fiber laminates (FMLs) specified in the test three-point bending test of uniaxial tensile, drum skin tests, tensile / shear test and short-beam. Two variants of FMLs considered, with and without adhesive films adhesive films between adherends and prepreg epoxy / glass. The FMLs tested at three different temperatures associated with successfully found those under real flight operating conditions, ie -60 ° C, room temperature and 80 ° C.

It was found that the temperature does not affect the tensile strength and shear strength of FMLs tested. However, there is a noticeable increase in the stiffness of samples runs at reduced temperatures. Additional adhesive film layer between the adherends and glass / epoxy prepreg significantly improves static power strip joints in both the reduced and at high temperatures. A clear increase in critical power where buckling occurs has been clearly demonstrated in uniaxial compression test panel glare-based rigid ribs. In the case of rib-rigid panel glare-based, critical power of the average 15 370 N, while for non-remitting variant, was 11,430 N, which translates into a 34.5% increase in critical power.


Information from the relaxation behavior of the polymer film is very important to assess the durability of emulsion polymer isocyanate (EPI) as a structural adhesive for bonding wood-based products. A sequence of tensile creep test and evaluation of EPI-free volume cured adhesive film for isothermal conditions is done by dynamic mechanical analysis and positron annihilation lifetime spectroscopy, respectively.

It was the first time to explore the creep response and physical aging EPI films, as well as the related microstructural evolution. The results showed that the creep characteristics of the glass EPI intimate layer depends on the crosslinker and time elapsed, and the ideal host momentary creep curve can be constructed in terms of the modified horizontal shift method.

 Strength Analysis of a Rib-Stiffened GLARE-Based Thin-Walled Structure
Strength Analysis of a Rib-Stiffened GLARE-Based Thin-Walled Structure

Brush Polymer Coating and Adhesion Technology in Skala

Creating strong joints between different materials for high performance hybrid products puts high demands on modern adhesive. Traditionally, the adhesion depends on the compatibility between the surface, often requiring the use of primer and bonding layer thickness to achieve a stable joint. Polymer brush layers allows kompatibilisasi material surface through more precise control of surface chemistry, facilitate strong adhesion through a nanometer-thin layer.

Here, we give a detailed account of our research on the adhesion promoted by the polymer brush along with examples of industrial applications. We discuss two fundamentally different adhesive mechanisms of brush polymers, namely (1) the physical bonding through entanglement and (2) chemical bonding.

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The former mechanism is demonstrated by, for example, a strong bond between the poly (methyl methacrylate) (PMMA) coated stainless steel brush and bulk PMMA, while the latter is indicated by, for example, improved adhesion between the silicon and titanium substrates, enabled by hydrosilane- modified poly (hydroxyethyl methacrylate ) (PHEMA) brushes.

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