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  • 1.
    Almgren, Karin M.
    et al.
    RISE, STFI-Packforsk.
    Gamstedt, E. Kristofer
    RISE, STFI-Packforsk.
    Nygård, P.
    Malmberg, F.
    Lindblad, J.
    Lindström, Mikael
    RISE, STFI-Packforsk.
    Role of fibre-fibre and fibre-matrix adhesion in stress transfer in composites made from resin-impregnated paper sheets2009In: International Journal of Adhesion and Adhesives, ISSN 0143-7496, E-ISSN 1879-0127, Vol. 29, no 5, p. 551-557Article in journal (Refereed)
    Abstract [en]

    Paper-reinforced plastics are gaining increased interest as packaging materials, where mechanical properties are of great importance. Strength and stress transfer in paper sheets are controlled by fibre-fibre bonds. In paper-reinforced plastics, where the sheet is impregnated with a polymer resin, other stress-transfer mechanisms may be more important. The influence of fibre-fibre bonds on the strength of paper-reinforced plastics was therefore investigated. Paper sheets with different degrees of fibre-fibre bonding were manufactured and used as reinforcement in a polymeric matrix. Image analysis tools were used to verify that the difference in the degree of fibre-fibre bonding had been preserved in the composite materials. Strength and stiffness of the composites were experimentally determined and showed no correlation to the degree of fibre-fibre bonding, in contrast to the behaviour of unimpregnated paper sheets. The degree of fibre-fibre bonding is therefore believed to have little importance in this type of material, where stress is mainly transferred through the fibre-matrix interface.

  • 2.
    Al-Ramahi, Nawres
    et al.
    Luleå University of Technology, Sweden ; Middle Technical University, Iraq.
    Joffe, Roberts
    RISE - Research Institutes of Sweden, Swerea, Swerea SICOMP. Luleå University of Technology, Sweden .
    Varna, Janis
    Luleå University of Technology, Sweden .
    Investigation of end and edge effects on results of numerical simulation of single lap adhesive joint with non-linear materials2018In: International Journal of Adhesion and Adhesives, ISSN 0143-7496, E-ISSN 1879-0127, Vol. 87, p. 191-204Article in journal (Refereed)
    Abstract [en]

    This paper presents systematic numerical study of stresses in the adhesive of a single-lap joint with the objective to improve understanding of the main material and geometrical parameters determining performance of adhesive joints. For this purpose a 3D model as well as 2D model, optimized with respect to the computational efficiency by use of novel displacement coupling conditions able to correctly represent monoclinic materials (off-axis layers of composite laminates), are employed. The model accounts for non-linearity of materials (adherend and adhesive) as well as geometrical non-linearity. The parameters of geometry of the joint are normalized with respect to the dimensions of adhesive (e.g. thickness) thus making analysis of results more general and applicable to wide range of different joints. Optimal geometry of the single-lap joint allowing to separate edge effect from end effects is selected based on results of the parametric analysis by using peel and shear stress distributions in the adhesive layer as a criterion. Three different types of single lap joint with similar and dissimilar (hybrid) materials are considered in this study: a) metal-metal; b) composite-composite; c) composite-metal. In case of composite laminates, four lay-ups are evaluated: uni-directional ([08]T and [908]T) and quasi-isotropic laminates ([0/45/90/-45]S and [90/45/0/-45]S). The influence of the abovementioned parameters on peel and shear stress distributions in the adhesive layer is examined carefully and mechanical parameters governing the stress concentrations in the joint have been identified, this dependence can be described by simple but accurate fitting function. The effect of the used material model (linear vs non-linear) on results is also demonstrated.

  • 3.
    Andersons, J.
    et al.
    University of Latvia, Latvia.
    Modniks, J.
    University of Latvia, Latvia; Ventspils University College, Latvia.
    Joffe, Roberts
    RISE, Swerea, SICOMP. Luleå University of Technology, Sweden.
    Madsen, B.
    DTU Technical University of Denmark, Denmark.
    Nättinen, K.
    Bemis Flexible Packaging Europe, Finland.
    Apparent interfacial shear strength of short-flax-fiber/starch acetate composites2016In: International Journal of Adhesion and Adhesives, ISSN 0143-7496, E-ISSN 1879-0127, Vol. 64, p. 78-85Article in journal (Refereed)
    Abstract [en]

    The paper deals with an indirect industry-friendly method for identification of the interfacial shear strength (IFSS) in a fully bio-based composite. The IFSS of flax fiber/starch acetate is evaluated by a modified Bowyer and Bader method based on an analysis of the stress-strain curve of a short-fiber-reinforced composite in tension. A shear lag model is developed for the tensile stress-strain response of short-fiber-reinforced composites allowing for an elastic-perfectly plastic stress transfer. Composites with different fiber volume fractions and a variable content of plasticizer have been analyzed. The apparent IFSS of flax/starch acetate is within the range of 5.5-20.5 MPa, depending on composition of the material. The IFSS is found to be greater for composites with a higher fiber loading and to decrease with increasing content of plasticizer. The IFSS is equal or greater than the yield strength of the neat polymer, suggesting good adhesion, as expected for the chemically compatible constituents.

  • 4. Blyberg, Louise
    et al.
    Serrano, Erik
    Enquist, Bertil
    Sterley, Magdalena
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP Trä.
    Adhesive joints for structural timber/glass applications: Experimental testing and evaluation methods2012In: International Journal of Adhesion and Adhesives, ISSN 0143-7496, E-ISSN 1879-0127, Vol. 35, p. 76-87Article in journal (Refereed)
  • 5. Leijonmarck, Simon
    et al.
    Cornell, Ann
    Danielsson, Carl-Ola
    Åkermark, Torbjörn
    Brandner, Birgit D
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, YKI – Ytkemiska institutet.
    Lindbergh, Göran
    Electrolytically assisted debonding of adhesives: An experimental investigation2012In: International Journal of Adhesion and Adhesives, ISSN 0143-7496, E-ISSN 1879-0127, Vol. 32, no 1, p. 39-45Article in journal (Refereed)
    Abstract [en]

    The technology of electrically assisted delamination has potential applications in many fields, such as easy-to-open consumer packaging and recycling of lightweight materials. A better understanding about the mechanisms leading to debonding is important for further development of the technique, and is a goal of this study. A functional epoxy-based adhesive, applied between two aluminum foils, has been investigated using electrochemical and surface analytical techniques. Delamination occurred at the anodic adhesive boundary, which became acidic during polarization. The reactions during polarization of the laminates consisted of two steps, with aluminum oxide/hydroxide formation as the first and the build-up of a sulfur rich organic film as the second. Several possible debonding processes are discussed.

  • 6.
    Serrano, Erik
    RISE, SP – Sveriges Tekniska Forskningsinstitut.
    A numerical study of the shear-strength-predicting capabilities of test specimens for wood–adhesive bonds2004In: International Journal of Adhesion and Adhesives, ISSN 0143-7496, E-ISSN 1879-0127, Vol. 24, no 1, p. 23-35Article in journal (Refereed)
  • 7.
    Spārniņš, E.
    et al.
    University of Latvia.
    Nyström, Birgitha
    RISE - Research Institutes of Sweden, Materials and Production, SICOMP.
    Andersons, J.
    University of Latvia.
    Interfacial shear strength of flax fibers in thermoset resins evaluated via tensile tests of UD composites2012In: International Journal of Adhesion and Adhesives, ISSN 0143-7496, E-ISSN 1879-0127, Vol. 36, p. 39-43Article in journal (Refereed)
    Abstract [en]

    A method of interfacial shear strength evaluation, based on the length distribution of fibers pulled out from the tensile fracture surface of an oriented flax-reinforced composite, is applied to composites with vinyl ester and acrylated epoxidized soy oil resin matrices. Two approaches for characterizing the strength of fibers with modified Weibull distribution, fiber fragmentation tests and fiber tension tests, are compared in the analysis of pull-out data. Interfacial shear strength is found to increase by a few percent when loading rate is increased from 1.33% to 8%/min. © 2012 Elsevier Ltd.

  • 8.
    Westerlind, B
    et al.
    Swedish Pulp and Paper Research Institute.
    Larsson, A
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, YKI – Ytkemiska institutet.
    Determination of the degree of adhesion in plasma-treated polyethylene/paper laminates1987In: International Journal of Adhesion and Adhesives, ISSN 0143-7496, E-ISSN 1879-0127, Vol. 7, no 3, p. 141-146Article in journal (Refereed)
    Abstract [en]

    It is shown that an oxygen or ammonia plasma treatment significantly improves the adhesion between low density polyethylene (LDPE) and cellulose. Plasma treatment of the polymer was more effective than treatment of the paper, and ammonia plasma seemed somewhat more effective than the oxygen treatment. The adhesion between polyethylene and cellulose was evaluated at room temperature using a non-linear double cantilever beam test. The effect of the discharge treatment on the surface composition of LDPE and cellulose was characterized using electron spectroscopy for chemical analysis. The improved adhesion may be due to an improved penetration of the porous paper surface by the LDPE-melt and to an increase in the interfacial attraction forces as a result of the introduction of polar groups in the surfaces.

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