Finite element analysis of timber containing branches – An approach to model the grain course and the influence on the structural behaviour

Jenkel, Christian; Kaliske, Michael

doi:10.1016/j.engstruct.2014.06.005

Cited by 26 publications

(8 citation statements)

References 21 publications

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“…The aim is to compute the ultimate load. The results of a FE-analysis according to Jenkel and Kaliske (2014) are applied to train an artificial neural network, which is used as input-output mapping f  . Thereby, the knots and the surrounding wood are not distinguished explicitly by element edges, but by means of material parameters at integration points.…”

Section: Timber Board Containing Knotsmentioning

confidence: 99%

“…The board analysed here is experimentally investigated in Stübi (2001), whereas the knots are documented in size and position on the board surfaces. The procedure for how to derive a geometrical model as shown in Figure 7 from these measurements is presented in Jenkel and Kaliske (2014). For the given example, the knots are described as cylinders passing the board in different angles.…”

Section: Figurementioning

confidence: 99%

“…The board contains 4 knots = {1, 2,3, 4} i . The original knot diameters 0,i d taken from Jenkel and Kaliske (2014) and Stübi (2001) are varied in-between 10%  . Thus, four fuzzy knot diameters…”

Section: Figurementioning

confidence: 99%

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Numerical simulation of wooden structures with polymorphic uncertainty in material properties

Leichsenring

Jenkel

Graf

et al. 2018

IJRS

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Uncertainties are inherently present in structural parameters such as loadings, boundary conditions or resistance of structural materials. Especially material properties and parameters of wood are strongly varying in consequence of growth and environmental conditions. To include this variation in structural analysis, available data needs to be modelled appropriately, e.g. by means of probability and, furthermore, fuzzy probability based random variables or fuzzy sets. In order to comprehend uncertainties induced by estimating the distribution parameters, the stochastic approach has been extended by fuzzy distribution parameters to fuzzy probability based random variables according to studies by Möller et al. To cope with epistemic uncertainties for e.g. geometric parameters of knotholes, fuzzy sets are used. The consequence for wooden structures is determined by fuzzy stochastic analysis in combination with a Finite Element (FE) simulation using a model suitable for characteristics of a timber structure by Jenkel and Kaliske.

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Section: Timber Board Containing Knotsmentioning

confidence: 99%

Section: Figurementioning

confidence: 99%

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Numerical simulation of wooden structures with polymorphic uncertainty in material properties

Leichsenring

Jenkel

Graf

et al. 2018

IJRS

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“…Finding the contact after element deletion on the interior element surfaces is defined by adapting the ABAQUS input file, in accordance with ABAQUS Inc. (2013a), via manually including the created interior surfaces to the contact definition. The resistance of wood against chipping is numerically represented based on findings by Niemz and Ozyhar (2011), Resch and Kaliske (2010), Schmidt and Kaliske (2006) and Jenkel and Kaliske (2014) applying an ideal elasto-plastic, ductile damage model with zero energy damage evolution, which is usually implemented for ductile metals (Table 1), according to Prantl et al (2013). The concept of integrating the anisotropic material behaviour in the simulation is to split the cut part into areas with changing isotropic material parameters, depending on the tool movement direction (cutting direction) and the main grain direction with respect to established Young's modulus E and fracture stress r f , ABAQUS Inc. (2013b).…”

Section: Methodsmentioning

confidence: 99%

Evaluation of wood material models for the numerical assessment of cutting forces in chipping processes

et al. 2017

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Generally, wood chipping represents an important procedure in the wood processing and forestry industry. To improve structural components like chipping tools, knowledge of the properties of local timber including resistance against chipping as well as the dynamically acting process forces is of utmost significance. The aim of this work is to experimentally evaluate service-induced stresses on machinery parts to create a numerical material model, which is capable of revealing similar resistance against cutting as natural wood. To this end, a small-scale cutting machine has been designed, incorporating a bladeholder with strain gauges applied, measuring the resulting mechanical stresses during the chipping process by focussing on different wood species. Spruce is utilized as a variety with a lower density and European beech for higher density timber applications. The test results demonstrate a distinct difference by cutting both materials, whereby European beech indicates more than twice the resistance against chipping compared to spruce. Setting two different, relatively acute rake angles on the cutting tool does not reveal a fundamental difference for chipping. To evaluate the numerical wood material model, an isotropic ductile damage model, usually applied to ductile metals, was implemented in this study. Based on a sensitivity study of the material properties in the course of the numerical simulation, a possible approach is presented that explains how to change the cutting resistance, depending on the blade movement direction and the angle of the main grain of the timber. In a comparison of different types of mechanical stress from the numerical analysis and experimental tests, the

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“…Toson [11] researched modeling by finite element method in wooden structures of balsa under severe loadings proposing a model that could represent the complex response of balsa wood material under different types of loading.…”

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confidence: 99%

The Challenges of Designing a Wooden Beam of Composed Section

Wahrhaftig¹,

Carvalho²

2016

JCEA

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This work describes details about the challenges and solutions encountered in the timber structure beam. The choice for wood is due to the fact that it is a better material suited for environments with high salinity and, in this context, to reduce maintenance costs. The entire roof was supported only by four columns, which forced the side and frontal beams to exceed spans over 18 meters without intermediate supports. This was the most important challenge of the project: to find a section to the beam which can attend the ultimate limit state and serviceability in wood to the dimensions in project. The answer was clear: It would need to have composed section. A computational model was constructed using the finite element method in order to obtain the efforts on the structural elements. It is important to emphasize that the design of a wood structure requires not only knowledge, but creativity as well, to overcome the challenges posed by the distinctive needs to the detailing of this material. In addition to that, it requires special attention during the construction execution, because of the difficulty that the carpenters have to read the specific plans.

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Finite element analysis of timber containing branches – An approach to model the grain course and the influence on the structural behaviour

Cited by 26 publications

References 21 publications

Numerical simulation of wooden structures with polymorphic uncertainty in material properties

Numerical simulation of wooden structures with polymorphic uncertainty in material properties

Evaluation of wood material models for the numerical assessment of cutting forces in chipping processes

The Challenges of Designing a Wooden Beam of Composed Section

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