Original scientific paper

https://doi.org/10.5552/drvind.2023.0004

Bending Moment of Mortise-and-Tenon Joints in a Crossed Chair Base

Seid Hajdarevic orcid.org/0000-0002-3636-010X ; University of Sarajevo, Faculty of Mechanical Engineering, Department of Wood Technology, Sarajevo, Bosnia and Herzegovina
Murco Obucina ; University of Sarajevo, Faculty of Mechanical Engineering, Department of Wood Technology, Sarajevo, Bosnia and Herzegovina
Manja Kitek Kuzman ; University of Ljubljana, Biotechnical Faculty, Ljubljana, Slovenia
Dick Sandberg ; Luleå University of Technology, Wood Science and Engineering, Skellefteå, Sweden

Abstract

This paper investigated the bending moment of chair base joints. The ultimate bending moments (maximum moment), calculated on the base of the measured maximum applied loads (maximum force), were compared for the front leg and rear leg joints of a chair base. The joints had different angles between the stretcher and the leg (joint angle) as well different tenon lengths (30 mm and 32 mm). The results of the tests indicated that for different test specimen configurations but the same tenon-and-mortise geometry, the maximum force of joints with a smaller value of joint angle (front leg joints) was higher than the force values of joints with a larger angle (rear leg joints) for all tenon lengths. However, the results showed less difference among the calculated bending moments of the analysed sets of joints. A significant difference was not revealed between the bending moments of joints with a smaller value of joint angle and the bending moments of joints with a larger angle for all tenon lengths. A significant difference between the bending moments for the tenon length of 30 mm and tenon length of 32 mm was determined for rear leg joints but not for front leg joints. The presented approach of joint strength analysis through the testing of specimens with different shapes and dimensions are applicable to research and practice.

Keywords

chair; mortise-and-tenon joint; bending moment; joint angle; tenon length

Hrčak ID:

296385

URI

https://hrcak.srce.hr/296385

Publication date:

25.3.2023.

Article data in other languages: croatian

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