Wedge splitting test of wood for fracture parameters estimation of Norway Spruce

Ostapska, Katarzyna; Malo, Kjell Arne

doi:10.1016/j.engfracmech.2020.107024

Cited by 17 publications

(4 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…After the condition given by the damage initiation criteria is met in the cohesive elements, the damage evolution phase defined by linear softening starts. The critical fracture energy values are based on Ostapska & Malo for Mode I (Ostapska and Malo 2020) and Ostapska for Mode II (Ostapska 2020), respectively. Furthermore, the mixed mode behaviour is regulated by Wu's criterion (Wu 1967), which has been proved accurate for wooden elements (Jernkvist 2001).…”

Section: Methodsmentioning

confidence: 99%

Finite element modelling and experimental verification of timber halved and tabled scarf joints

Massaro

Stamatopoulos

Andersen

et al. 2022

International Wood Products Journal

View full text Add to dashboard Cite

Carpentry joints are very common in existing timber structures and they may gain attention for contemporary structures, due to their high degree of reversibility. Therefore, reliable Finite Element (FE) models for carpentry joints can contribute to assessing their capacity and provide a better insight into the parameters influencing their mechanical properties. This paper presents a FE study (using Abaqus) of timber halved-and-tabled scarf joints, together with experimental results. The FE-model considers fracture due to combined shear and tension perpendicular-to-grain by using cohesive zone modelling. Experimental tests on spruce solid timber specimens were performed to validate the model. The specimens were constructed by the use of a CNC-machine. For comparative purposes, two handmade specimens were tested, resulting in a lower load capacity. The FE results showed that initial gaps have a considerable effect on capacity. For certain assumed initial gaps, the FE-model could predict the capacity, however, it underestimated the deformation.

show abstract

Section: Methodsmentioning

confidence: 99%

Finite element modelling and experimental verification of timber halved and tabled scarf joints

Massaro

Stamatopoulos

Andersen

et al. 2022

International Wood Products Journal

View full text Add to dashboard Cite

show abstract

“…In order to determine Mode I fracture properties of wood, different methods have been used so far by the researchers. Testing procedures included: three-point bending test [3,4], single-edge-notch specimen [5], wedge-splitting test [6][7][8], tapered double cantilever beam test [9,10], and double cantilever beam test [11][12][13]. The single-edge-notch specimen and wedge-splitting test represent standard geometries for determination of fracture energy for wooden products employed in timber engineering.…”

Section: Figure 2: Crack Tip Region With Fibre-bridging Zonementioning

confidence: 99%

Experimental Determination of R Curves for European Spruce Using DCB Tests

Todorović

Pavlović

Glišović

et al. 2023

World Conference on Timber Engineering (WCTE 2023)

View full text Add to dashboard Cite

This paper presents an experimental procedure for obtaining the fracture resistance (R curve) of solid wood specimens made of spruce. Double Cantilever Beam (DCB) tests were performed in order to determine energy release rate vs crack length in Mode I wood fracture (crack opening). Ten wood specimens were loaded using the Universal Testing Machine and force-displacement curves were recorded. The most important parameter -crack length was monitored as the crack propagates using Digital Image Correlation (DIC) method. In order to obtain accurate R curve results, procedure which includes calculating cumulative released energy was employed. The cohesive energy Gf was determined based on the R curves. These results can further be analysed in order to obtain cohesive law for Mode I fracture of wood.

show abstract

“…The damage evolution phase in the layers A and B is controlled by the energy method with linear softening [18,32]. The critical values of the fracture energy for the opening mode (mode I) and shearing mode (mode II) are chosen as the average of the values reported by Ostapska [33] and Ostapska and Malo [34]. Furthermore, the mixed mode, usually relevant in beams with holes, is here described by Wu's criterion [35,36] presented in Equation ( 2).…”

Section: Numerical Simulationsmentioning

confidence: 99%

Glued-Laminated Timber Beams With Large Round Holes: An Experimental and Numerical Investigation

Massaro

Malo

2023

World Conference on Timber Engineering (WCTE 2023)

View full text Add to dashboard Cite

Timber beams are oftentimes used as joists in timber floors. Especially for small timber buildings like twostory housing for single or few families, it may be necessary to let service pipes pass through the joists to avoid a reduction of the story height. Therefore, there is a need to have large holes in the timber joists, which under the current local guidelines and the future European regulations, leads to the use of timber beams of significant height. In this study, the capacity of glued-laminated timber beams with large round holes is evaluated. The paper presents results from novel experiments performed on beams with round holes positioned in two different configurations. The holes are considered as large, i.e. the diameter of the holes is 50% of the timber beam height or larger. The objectives are, in addition to the experimental investigations, to establish a numerical simulation approach of these experiments which can be used to future studies of possible solutions to the challenge of large holes in timber joists. For comparison, an analytical evaluation of the beams capacity in accordance with the future European regulations is added.

show abstract

Wedge splitting test of wood for fracture parameters estimation of Norway Spruce

Cited by 17 publications

References 18 publications

Finite element modelling and experimental verification of timber halved and tabled scarf joints

Finite element modelling and experimental verification of timber halved and tabled scarf joints

Experimental Determination of R Curves for European Spruce Using DCB Tests

Glued-Laminated Timber Beams With Large Round Holes: An Experimental and Numerical Investigation

Contact Info

Product

Resources

About