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Finite element analysis of timber beams with flaws
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Wood Science and Engineering.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Wood Science and Engineering.ORCID iD: 0000-0002-0145-080X
Slovak University of Technology in Bratislava.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Wood Science and Engineering.ORCID iD: 0000-0002-4686-4010
Number of Authors: 4
2016 (English)In: ECCOMAS Congress 2016: Proceedings of the 7th European Congress on Computational Methods in Applied Sciences and Engineering / [ed] M. Papadrakakis; V. Papadopoulos; G. Stefanou; V. Plevris, Athens: National Technical University of Athens , 2016, Vol. 4, 8606-8611 p.Conference paper, Published paper (Refereed)
Abstract [en]

The work was focused on modelling of cracks and simulations of their propagationin timber beams. The aim was to find out the influence of flaws on load-carrying capacity. Inbeam design and beam inspection, it is necessary to determine the load-carrying capacity of abeam with flaws. There is not much information in literature about the influence of flaws onbending and shear strength of timber beams. Standards for fracture mechanics design approachfor timber structures are not easily available.The results from simulations of loaded timber beams with flaws are discussed in this paper.Two different types of timber beams were analysed. First type was a sawn timber beam andfor that four different models were analysed: first model was a beam without flaw; secondmodel was a beam with a straight central flaw; next was a beam with an oblique crack andfourth beam had a round hole in the middle of the span. Second type of beam was a gluedlaminated timber beam (glulam). For this type, five different models were analysed. First fourvariants were the same as for the solid timber beam and the fifth variant had an initial crackalong a glue line. We analysed these types of flaws, since they are the most common flaws inwood.Simulations were conducted in ABAQUS. Material properties of wood used in the modelswere retrieved from standards; C24 for solid timber and GL24c for glulam timber beams.Dimensions of beams were the same for all variants and beams were considered simply supported.For an analysis of crack propagation, linear elastic fracture mechanics was considered.Modelling fracture was conducted using the extended finite element method (XFEM).The energy approach was used for the analysis of crack propagation. Comparing results forsolid and glulam beams with and without cracks gave us an overview how different flaws influenceload-carrying capacity of the beams and under which loading failure occurs. Simulatingtimber beams is more complicated compering to steel or plastic. By understanding how tosimulate flaws in wood material it is possible to obtain reliable results with finite elementanalysis

Place, publisher, year, edition, pages
Athens: National Technical University of Athens , 2016. Vol. 4, 8606-8611 p.
Keyword [en]
Engineering mechanics - Solid mechanics
Keyword [sv]
FEA, Fracture Mechanics, Timber Beams, XFEM, Wood., Teknisk mekanik - Fastkroppsmekanik
National Category
Other Mechanical Engineering
Research subject
Attractive built environment (AERI); Wood Science and Engineering
Identifiers
URN: urn:nbn:se:ltu:diva-38358Local ID: cba27b13-a85c-47f8-8fd9-7ae4907fd81cISBN: 9786188284401 (print)OAI: oai:DiVA.org:ltu-38358DiVA: diva2:1011858
Conference
VII European Congress on Computational Methods in Applied Sciences and Engineering, Crete Island, Greece, 5–10 June 05/06/2016 - 10/06/2016
Note

Godkänd; 2016; 20160810 (matse)

Available from: 2016-10-03 Created: 2016-10-03 Last updated: 2017-11-25Bibliographically approved

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https://www.eccomas2016.org/proceedings/

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