The Experts below are selected from a list of 693 Experts worldwide ranked by ideXlab platform

Stojan Kravanja - One of the best experts on this subject based on the ideXlab platform.

  • flexural analysis of laminated solid wood beams with different shear connections
    Construction and Building Materials, 2018
    Co-Authors: Primož Jelusic, Stojan Kravanja
    Abstract:

    Abstract The paper discusses the mechanical response of laminated solid wood beams with different shear connections. Experimental, analytical (gamma method) and numerical (finite element analysis) procedures were performed to estimate the effect of shear connections on the stiffness and the failure capacity of laminated solid wood beams. The 4-point bending tests were carried out on the simply supported laminated wood beams with rigid Adhesive bonding, on laminated wood beams with Elastomeric Adhesive bonding, on screw-laminated beams (with vertical and inclined screws) and laminated beams without bonding. The results obtained from the experimental tests, and the analytical and the numerical test calculations were analysed and compared. These results show that the flexural stiffnesses of inclined screw-laminated wood beams and of laminated beams with Elastomeric Adhesive bonding are similar. Both stiffnesses are up to twice the amount of that of vertical screw-laminated wood beams. However, the stiffness of the laminated beams with rigid Adhesive is even fifty per cent higher than that of the previously mentioned two similar stiffnesses.

Costantino Creton - One of the best experts on this subject based on the ideXlab platform.

  • Adhesion between chemically heterogeneous switchable polymeric brushes and an Elastomeric Adhesive.
    Langmuir, 2005
    Co-Authors: Haris Retsos, Ganna Gorodyska, Anton Kiriy, Manfred Stamm, Costantino Creton
    Abstract:

    : We investigated the Adhesive properties of binary heterogeneous polymer brushes made from end-functionalized polystyrene (PS) and poly(2-vinylpyridine) (P2VP) chains. The molecular organization of the mixed brush could be varied reversibly by exposure to selective solvents for PS (toluene) and for P2VP (acidic water). This exposure results in reversible switching of Adhesive and wetting properties. The manner in which the adhesion switching occurs can be tuned by the composition of mixed brushes. However, the outer surface composition could be enriched more effectively in PS after the toluene treatment than in P2VP after the acidic water treatment. As a result, the mixed brush compositions that showed the largest difference in properties between an exposure to toluene and an exposure to water were the P2VP-rich compositions. Adhesive properties, tested against a soft hydrophobic pressure-sensitive Adhesive (PSA) using a probe test, always showed smaller differences between solvent treatments than wetting properties with water, suggesting a much higher sensitivity of the hydrophobic/hydrophilic brushes to polar molecules than to nonpolar molecules.

  • Reversible adhesion between chemically heterogeneous switchable polymeric brushes and an Elastomeric Adhesive
    2004
    Co-Authors: Haris Retsos, Regis Schach, Ganna Gorodyska, Anton Kiriy, Manfred Stamm, Costantino Creton, Hohe Strasse
    Abstract:

    1 of polymer deposition. Those mixed (binary) brushes undergo phase segregation depending on environment resulting in a remarkable switching of morphology and surface energetic state. This investigation aims to study the influence of the switching phenomenon of mixed brushes on the strength of the interface which such a surface can form with an Adhesive. The surfaces are particularly useful to tune the Adhesive properties of soft Adhesives. This class of Adhesives is gaining increasing interest in industry and medicine for its low toxicity and ease of use. Knowing the main requirements for such Adhesives provides the capability to generate reversible, fast and easy adhering bonds to different substrates in a controlled environment.

Haris Retsos - One of the best experts on this subject based on the ideXlab platform.

  • Adhesion between chemically heterogeneous switchable polymeric brushes and an Elastomeric Adhesive.
    Langmuir, 2005
    Co-Authors: Haris Retsos, Ganna Gorodyska, Anton Kiriy, Manfred Stamm, Costantino Creton
    Abstract:

    : We investigated the Adhesive properties of binary heterogeneous polymer brushes made from end-functionalized polystyrene (PS) and poly(2-vinylpyridine) (P2VP) chains. The molecular organization of the mixed brush could be varied reversibly by exposure to selective solvents for PS (toluene) and for P2VP (acidic water). This exposure results in reversible switching of Adhesive and wetting properties. The manner in which the adhesion switching occurs can be tuned by the composition of mixed brushes. However, the outer surface composition could be enriched more effectively in PS after the toluene treatment than in P2VP after the acidic water treatment. As a result, the mixed brush compositions that showed the largest difference in properties between an exposure to toluene and an exposure to water were the P2VP-rich compositions. Adhesive properties, tested against a soft hydrophobic pressure-sensitive Adhesive (PSA) using a probe test, always showed smaller differences between solvent treatments than wetting properties with water, suggesting a much higher sensitivity of the hydrophobic/hydrophilic brushes to polar molecules than to nonpolar molecules.

  • Reversible adhesion between chemically heterogeneous switchable polymeric brushes and an Elastomeric Adhesive
    2004
    Co-Authors: Haris Retsos, Regis Schach, Ganna Gorodyska, Anton Kiriy, Manfred Stamm, Costantino Creton, Hohe Strasse
    Abstract:

    1 of polymer deposition. Those mixed (binary) brushes undergo phase segregation depending on environment resulting in a remarkable switching of morphology and surface energetic state. This investigation aims to study the influence of the switching phenomenon of mixed brushes on the strength of the interface which such a surface can form with an Adhesive. The surfaces are particularly useful to tune the Adhesive properties of soft Adhesives. This class of Adhesives is gaining increasing interest in industry and medicine for its low toxicity and ease of use. Knowing the main requirements for such Adhesives provides the capability to generate reversible, fast and easy adhering bonds to different substrates in a controlled environment.

Robert J. Hoyle - One of the best experts on this subject based on the ideXlab platform.

  • Elastomeric Adhesive Properties-Shear Strength, Shear Modulus, Creep, and Recovery
    Wood and Fiber Science, 2007
    Co-Authors: C. C. Dong, Robert J. Hoyle
    Abstract:

    Three commercially available Adhesives, approved for use in field glued floor systems, were evaluated for potential structural application in light frame wood buildings. All had adequate static shear strength for common floor and roof sheathing uses. Two were sufficiently rigid to generate useful composite action. One displayed relative creep compatible with wood structural design practice but two had excessive relative creep. The Adhesive with good creep properties also had good recovery properties. The other two had poor recovery properties. One Adhesive that had good shear strength in a conventional block shear test would not consistently sustain stress as low as 25 psi for more than four days. All tests were conducted on bonded wood specimens at 70 F (21 C) and 12% EMC.

  • Design Method for Elastomeric Adhesive Bonded Wood Joist-Deck Systems
    Wood and Fiber Science, 2007
    Co-Authors: W. Denis Mcgee, Robert J. Hoyle
    Abstract:

    The paper describes the development of equations for designing joist-deck systems in which the two elements are connected with Elastomeric Adhesives. The equations permit calculation of tension and compression stress in the elements, shear stress at the bond line, and deflection. They apply for continuous sheathing or for panels with effective splice joints. Graphs illustrating a specific application to residential floor systems are presented. These are interpreted to show that moderately rigid Elastomeric Adhesives, of the stiffer types available, should achieve 70 to 80% of the improvement in deflection that is possible with rigid Adhesives. The paper indicates that while creep may not be a deterrent to use of Elastomeric Adhesives structurally, additional study is needed.

Primož Jelusic - One of the best experts on this subject based on the ideXlab platform.

  • flexural analysis of laminated solid wood beams with different shear connections
    Construction and Building Materials, 2018
    Co-Authors: Primož Jelusic, Stojan Kravanja
    Abstract:

    Abstract The paper discusses the mechanical response of laminated solid wood beams with different shear connections. Experimental, analytical (gamma method) and numerical (finite element analysis) procedures were performed to estimate the effect of shear connections on the stiffness and the failure capacity of laminated solid wood beams. The 4-point bending tests were carried out on the simply supported laminated wood beams with rigid Adhesive bonding, on laminated wood beams with Elastomeric Adhesive bonding, on screw-laminated beams (with vertical and inclined screws) and laminated beams without bonding. The results obtained from the experimental tests, and the analytical and the numerical test calculations were analysed and compared. These results show that the flexural stiffnesses of inclined screw-laminated wood beams and of laminated beams with Elastomeric Adhesive bonding are similar. Both stiffnesses are up to twice the amount of that of vertical screw-laminated wood beams. However, the stiffness of the laminated beams with rigid Adhesive is even fifty per cent higher than that of the previously mentioned two similar stiffnesses.