Visko‐elastisches Verhalten von Holz‐Klebstoff‐Verbindungen unter zyklischer Zug‐Druck‐Belastung

Visco‐elastic behavior of bonded wood under cyclic tensile and compression loading In the present contribution, a test method is used to simulate the static, cyclic loading of adhesive joints due to swelling and shrinking of the wood and to demonstrate the plastic deformation in the low load range. For tensile shear specimens prepared from beech wood and bonded with three different adhesives (MUF, PRF, PUR), the elastic behavior under cyclic tensile and compression loading was investigated and the loss and storage of energy was determined. All tested adhesives showed viscose parts even at a very low load level of 3 MPa. At a load level of 7 MPa, the PRF joints revealed a more elastic behavior than the other. The increased loss energy determined for the PUR bonding indicates a softening of the adhesive joint.     

Versuche zur Ermittlung der Eigenschaften von gebrochenem Verbundsicherheitsglas (VSG) und Berechnung der Resttragfähigkeit eines Glasbogens

Tests to determine the characteristics of broken laminated safety glass and a calculation of the remaining structural capacity of a glass arch. The aim of this work is to show, in an exemplary way, using a glass arch with tension rod possibilities to calculate the remaining structural capacity of broken laminated glass. To achieve this aim tensile and bending tests on PVB‐foil and broken laminated safety glass were carried out at 10 °C. Furthermore experiments to determine the friction between broken laminated glass and steel and neoprene were performed.