Rods glued in engineered hardwood products part II: Numerical modelling and capacity prediction |
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| Affiliation: | 1. Fraunhofer-Institut für Fertigungstechnik und Angewandte Materialforschung IFAM, Wiener Straße 12, 28 359 Bremen, Germany;2. University of Applied Sciences Wiesbaden Rüsselsheim, Laboratory of Timber Engineering, Kurt-Schumacher- Ring 18, 65 197 Wiesbaden, Germany;3. Dortmund University, Material Test Engineering, Baroper Str. 303, 44 227 Dortmund, Germany;1. Karlsruhe Institute of Technology (KIT), Research Center for Steel, Timber and Masonry, Karlsruhe, Germany;2. Fraunhofer Institute for Manufacturing Technology and Advanced Materials IFAM, Bremen, Germany;1. School of Woodworking Skills, Bhartiya Skill Development University, Jaipur, India;2. Mechanical Engineering Department, Graphic Era (Deemed to be University), Dehradun, Uttarakhand, India;1. Department of Wood Engineering and Technology, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Iran;2. Department of Mechanical Engineering, University of Bath, Bath, UK;1. Université Paris-Est, Laboratoire Navier (UMR 8205), Ecole des Ponts ParisTech, F-77455 Marne-la-Vallée, France;2. Centre Scientifique et Technique du Bâtiment, 77420 Champs-sur-Marne, France |
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| Abstract: | The second part of this series of two papers presents the modelling and strength prediction of Glued-in Rods (GiR) experimentally investigated in Part I. Unlike what has been documented in previous publications, significant effort was put into extensive modelling of all components (adhesive, wood, and rods), in particular regarding stress components other than shear. Based upon the material modelling, stresses inside the GiR were estimated through Finite-Element Analysis (FEA), which indicated that transverse tensile strength are at least as significant as shear stresses in their magnitude. Both results mitigate previous research findings that focused on shear-dominated failure mechanisms and neglected transverse tensile strength. Combining the material characterisation with FEA, and reformulating strength in probabilistic terms, then allowed to perform predictions of joint capacities for all 60 experimentally investigated GiR-configurations. The comparison between predicted and experimental values showed a good agreement wit relative difference amounting to –3% for beech GLT, –2% for oak GLT, and +1%, respectively. Unlike Fracture Mechanics and Cohesive Zone Modelling, necessary parameters were solely obtained independently from the GiR itself, and no single parameter had to be back-fitted on the experimental results of the GiR. Results clearly showed that transverse tensile strength of the wood is at least as important as shear strength for joint capacity of GiR, and that longitudinal strength plays a minor role. |
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| Keywords: | A. Adhesives for wood B. Steels, wood and wood composites C. Destructive testing, joint design, numerical modelling D. Adhesion, cohesion, fracture, mechanical properties of adhesives |
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