Abstract
In this study, the relatively new picture frame method applied to wood is compared with three established shear test methods, namely the experimental modal analysis, the square plate twist method and the torsion test. For the investigations, the wood species European beech (Fagus sylvatica L.) and spruce (Picea abies L. Karst.) were used and the shear tests were conducted in LR and RL direction. The results show comparable shear moduli for beech and spruce in the range of 931–1289 Nmm−2 and 495–842 Nmm−2, respectively. In contrast to the theory of linear elastic orthotropic materials, significant differences in the results of the picture frame method between LR and RL direction were observed for spruce.
Highlights
There is currently no valid European standard for determining the shear modulus of small clear wood samples
Ten replicates were used for determining the shear modulus by experimental modal analysis (EMA) and afterwards by plate-twist method (PTM)
The shear modulus of beech and spruce was obtained in this study by four different test methods
Summary
There is currently no valid European standard for determining the shear modulus of small clear wood samples. The picture frame method for fibrereinforced composites (DIN SPEC 4885 2014), was used and adapted to wood It is suitable for investigating both shear modulus and shear strength. There is currently no direct comparison of this new method with other established methods for determining the shear modulus of wood. For this reason, the aim of this paper is to compare the new picture frame method with three other test methods, namely experimental modal analysis, square-plate twist method and torsion test. The focus of this study is only the shear modulus and not the shear strength, because non-destructive tests are used (modal analysis, square plate twist method)
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
