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

Abstract

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.

Modelling and simulation of a tenoning jig to predict performance and failure mode on circular saw machine

“…The friction coefficient has been assumed to be equal to 0.33. 42 The mesh density of the wood-based sample was approximately 1.4 mm. Two types of FE models were created in this work.…”

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

“…Nevertheless, it should be noted that the shear moduli are independent from the normal moduli and thus the material was modeled differently from transversally isotropic. The normal moduli Ex, Ey, Ez and the shear moduli Gxy, Gxz are chosen according to the K-beams technical approval [21], while Gyz as 1/10 of the other shear moduli, and the Poisson's ratios are selected based on Dahl [26] and Massaro et al [27]. The elastic material properties used in the numerical model are given in Table 2, where the subscript "x" indicates the grain direction.…”

“…The mean values for shear and tension parallel to grain strength have been obtained from the results of the experiments performed by Treteknisk [28][29][30] on the Kbeams. On the other hand, the tension orthogonal to grain mean strength has been assumed based on Dahl [26] and Massaro et al [27], while the compression parallel to grain mean strength was based on the K-beams Technical Approval [21,31].…”