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Michael Scheffler, Tony Weber, Peter Niemz, Hans-Jrgen Hardtke
Determination of residual stress in bonded wood components
Keywords: deformation, finite element analysis (FEA), fringe pattern method, glue line, longitudinal tensile shear, strain
Climate tests on double-layered samples were performed to detect deformation and induced stress concentrations. The paper is divided into two parts. The first presents experimental results for double-layered specimens. These specimens consisted of two wooden layers (each conditioned at a different climate before bonding) that were bonded using two different adhesives. The displacement field of the specimens was measured by means of digital fringe projection. The second part presents finite element results for two model stages using coupled thermal-mechanical analysis. For the first simple model, both orthotropic properties and the grain orientations were taken into account to investigate the behavior of the layers in principle. The results were compared to those for the experimental set-up. The improved second-stage model considers the adhesive layer between the wooden layers. The experimental and computational results of the improved simulation model are in good agreement. In the future, if inelastic material behavior is considered in a competitively superior manner, even better simulation results can be expected.
Holzforschung, Walter de Gruyter
Print ISSN: 0018-3830
Volume: 61, 05/2007
Pages: 285 - 290