University of Natural Resources and Life Sciences, Vienna (BOKU) - Research portal
Gewählte Master / Diploma Thesis:
Eva Günther
(2014):
Ermittlung der Bruchenergie von Spanplatten mit erhöhtem Klebstoffanteil.
Master / Diploma Thesis - Institut für Holztechnologie und Nachwachsende Rohstoffe,
BOKU-Universität für Bodenkultur,
pp 77.
UB BOKU
obvsg
- Abstract:
- In this thesis a method was developed for the determination of the fracture energy of particle boards in wet condition, after a boiling treatment. The method developed is based on an existing test setup for the determination of the in-plane specific fracture energy of wood based panels. In the existing test setup specimens are bonded to steel braces with a cyan acrylic resin. The forces for the mechanical testing are transferred into the specimen by the braces. Due to the difficulty of a water resistant bonding between steel braces and wood sample this method cannot be applied in wet conditions after boiling. Hence the steel braces were replaced by water resistant plywood. By bonding the samples in between the plywood braces with 1K Polyurethane sufficient bondstrength was achieved. Particle boards with increased resin content were tested according existing standards for following properties: internal bonding after boiling treatment, bending strength, swelling behavior und density. The results were compared with the specific fracture energy and the critical stress intensity factor by the fracture energy tests. The comparison of the so far utilized standard tests with the fracture energy showed generally good correlation. The method can be utilized for further quality control. For the determination of the standard values the specimen are gained from boards by a stated sample cutting plan. An analysis of the sample position showed, that specimen from the outer regions of the board have process related lower mechanical properties than samples from the center of the board. For further investigations a modified specimen cutting plan is proposed.
- Beurteilende(r): Müller Ulrich
- 1.Mitwirkender: Konnerth Johannes