Numerical simulation tool for wooden boards with a physically based approach to identify structural failure

Lukacevic, Markus; Füssl, Josef

doi:10.1007/s00107-014-0803-y

Cited by 54 publications

(28 citation statements)

References 12 publications

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“…In contrast, for ductile failure mechanisms, like observed within cross-laminated timber plates under point loads, it could be shown that the application of strength profiles in the framework of limit analysis Li 2018), i.e. in combination with perfect plasticity models, leads to reasonably effective strength estimates.…”

Section: Resultsmentioning

confidence: 99%

“…The 3D knot geometries of each knot group were used to compute the 3D fibre angle course within the volume of the board using the procedure outlined in Hackspiel et al (2014) and Lukacevic and Füssl (2014). This procedure follows the so-called grain-flow analogy (Foley 2003).…”

Section: Stiffness Profilesmentioning

confidence: 99%

“…c After the regrouping procedure has been applied, only the most important knot groups are retained in the model. The resulting stiffness profiles using the approach outlined in (Kandler et al 2015) as well as the 3D FE approach (Lukacevic and Füssl 2014) for each knot group are displayed in d. In e, different strength profiles according to IPs 1 to 4 are displayed presented in Lukacevic et al (2015), different combinations of the following parameters were considered: -Knot-area-ratio (KAR), which is the ratio between the knot area of all knots of a knot group projected on the cross section and the cross section area. -Knot area, which denotes the knot area visible on the surface of the board.…”

Section: Strength Profilesmentioning

confidence: 99%

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Experimental study on glued laminated timber beams with well-known knot morphology

2018

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Nowadays, the impact of knots on the failure behaviour of glued laminated timber (GLT) beams is considered by subjecting the single lamellas to a strength grading process, where, i.a., tracheid effect-based laser scanning is used to obtain information about knot properties. This approach single-handedly defines the beam's final strength properties according to current standards. At the same time, advanced production processes of such beams would allow an easy tracking of a scanned board's location, but, at this point, previously obtained detailed information is already disregarded. Therefore, the scanning data is used to virtually reconstruct knot geometries and group them into sections within GLT beams. For this study, a sample of 50 GLT beams of five different configuration types was produced and tested under static four-point-bending until failure. As for each assembled lamella the orientation and position within the corresponding GLT beam is known, several parameters derived from the reconstructed knots can be correlated to effective GLT properties. Furthermore, the crack patterns of the tested beams are manually recorded and used to obtain measures of cracks. A detailed analysis of the generated data and their statistical evaluation show that, in the future, dedicated mechanical models for such timber elements must be developed to realistically predict their strength properties. A potential approach, using fluctuating section-wise effective material properties, is proposed.

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Section: Resultsmentioning

confidence: 99%

Section: Stiffness Profilesmentioning

confidence: 99%

Section: Strength Profilesmentioning

confidence: 99%

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Experimental study on glued laminated timber beams with well-known knot morphology

2018

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“…An important attribute of this paradigm is a mathematical expression to capture the geometry of growth layers in the vicinity of knots by which the fibre angle in the longitudinal-radial plane is determined. Models of timber in which the paradigm/model suggested by Foley was integrated have also been established and used for detailed structural mechanics analyses (Hackspiel 2010;Lukacevic and Füssl 2014). Another starting point to describe the fibre course around knots is the assumption that the fibres are oriented such that the principal stresses during growth of the tree coincide with the fibre orientation (Mattheck 1997).…”

Section: Hypothesis and Models For Fibre Orientation Around Knotsmentioning

confidence: 99%

Growth layer and fibre orientation around knots in Norway spruce: a laboratory investigation

Briggert

Olsson

et al. 2017

Wood Sci Technol

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The strength of structural timber largely depends on the occurrence of knots and on the local material directions in the surroundings of such knots. There is, however, a lack of methods for establishing a full dataset of the local material directions. The present research aims at the development and application of a laboratory method to assess the geometry of growth layers and the orientation of fibres in a high-resolution 3D grid within wood specimens containing knots. The laboratory method was based on optical flatbed scanning and laser scanning, the former resulting in surface images and the latter, utilizing the tracheid effect, resulting in in-plane fibre angles determined in high-resolution grids on scanned surfaces. A rectangular solid wood specimen containing a single knot was cut from a tree in such a way that it could be assumed that a plane of symmetry existed in the specimen. By splitting the specimen through this plane through the centre line of the knot, two new specimens with assumed identical but mirrored properties were achieved. On one of the new specimens, the longitudinal-radial plane was subsequently scanned, and the longitudinal-tangential plane was scanned on the other. Then, by repeatedly planing off material on both specimens followed by scanning of the new surfaces that gradually appeared, 3D coordinate positions along different growth layers and 3D orientation of fibres in a 3D grid were obtained. Comparisons between detected fibre orientation and growth layer geometry were used for the assessment of the accuracy obtained regarding 3D fibre orientation. It was shown that the suggested method is well suited to capture growth layer surfaces and that it provides reliable information on 3D fibre orientation close to knots. Such knowledge is of great importance for understanding the properties of timber including

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“…Fatigue of wood pallet materials is a routine drawback of members or structures that are exposed to regularly executed loading [3]. Literature of fatigue performance and tolerable design of wood pallets stresses is very limited and very little research has been carried out on the poplar wood pallet's fatigue response in computational engineering [4,5]. Failure of material under cyclic or fluctuating loading conditions is identified as fatigue failure.…”

Section: Introductionmentioning

confidence: 99%

Explicit Analysis of Cyclic Fatigue Behavior of Poplar Wood Pallet by Computational Engineering - Von Mises Yield, Goodmen and N-S Diagram Approach

Karaçalı

2017

Acta Phys. Pol. A

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Wood pallets are important carrying tools, defined in packaging engineering, for fragile or any kind of heavy goods. Wood pallets are exposed to flexural forces resulting in fracture and fatigue during transportation. In this research, the fracture and fatigue behavior of wood pallet system under loading was investigated, taking into account nail and pallet material behavior, using strain-stress distribution by computational finite element analysis. Static and dynamic numerical analysis was performed on the 3D model of poplar wood pallet using ANSYS computational system. To validate the data gathered from Von Mises yield, Goodman and N-S fatigue diagrams were established to predict fatigue life. The finite element models built in this research may assist the design engineers and manufacturers in evaluation of new design strategies of poplar wood pallets.

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Numerical simulation tool for wooden boards with a physically based approach to identify structural failure

Cited by 54 publications

References 12 publications

Experimental study on glued laminated timber beams with well-known knot morphology

Experimental study on glued laminated timber beams with well-known knot morphology

Growth layer and fibre orientation around knots in Norway spruce: a laboratory investigation

Explicit Analysis of Cyclic Fatigue Behavior of Poplar Wood Pallet by Computational Engineering - Von Mises Yield, Goodmen and N-S Diagram Approach

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