Influence of the Number of Layers on the Strength of Beech Laminated Elements in the Three-Point Flexural Test

Authors

  • Roman Réh Department of Mechanical Wood Technology, Faculty of Wood Sciences and Technology, Technical University
  • Miloš Hitka Department of Economics, Management and Business, Faculty of Wood Sciences and Technology, Technical University in Zvolen
  • Milan Naď Institute of Applied Informatics, Automation and Mechatronics, Faculty of Materials Science and Technology in Trnava, Slovak University of Technology in Bratislava
  • Nadežda Langová Department of Furniture and Wood Products, Faculty of Wood Sciences and Technology, Technical University in Zvolen
  • Ladislav Rolník Institute of Applied Informatics, Automation and Mechatronics, Faculty of Materials Science and Technology in Trnava, Slovak University of Technology in Bratislava, Jána Bottu 2744/24, 917 24 Trnava, Slovakia
  • Seng Hua Lee Department of Wood Industry, Faculty of Applied Sciences, Universiti Teknologi MARA Pahang Branch Campus Jengka
  • Maciej Sydor Department of Woodworking and Fundamentals of Machine Design, Faculty of Forestry and Wood Technology, Poznań University of Life Sciences

Keywords:

Molded European beech lamellas, Wooden chairs, Three-point bending test, Number and strength of beech lamellas

Abstract

A chair is a piece of furniture whose elements are loaded with relatively high forces. The strength of these elements is vital for the safety of using this type of furniture. The research aims to test the chair material system made of beech wood. The authors analyzed laminated elements with 9, 11, and 13 layers of veneers. The veneers were 1.23 mm thick, with perpendicular fiber directions in adjacent layers, and bonded with 220 g/m2 of PVAc adhesive. The moisture content of the elements was 6 ± 1%. A three-point bending flexural test was performed to determine the stress-strain response of the tested three variants. A complementary numerical analysis allowed a more precise comparison of the three analyzed laminated elements variants. It was confirmed that all variants exceed the desired minimal values in chair support design. Moreover, the average strength values for tested laminated elements, differing in the number of veneers, were sufficient even with a reduced number of veneer layers. The experiments and numerical analysis results confirmed the usability of the three tested types of beech laminated elements to be used as highly loaded chair elements.

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Published

2023-02-27

Issue

Vol. 18 No. 2 (2023)

Section

Research Article or Brief Communication