Strength Classification of Chairs made with Loose Tenon and Mortise Joint using Two Lesser-utilized Timber Species

DOI

10.2991/978-94-6463-970-4_43How to use a DOI?

Keywords

Furniture; manufacturers; timber species; furniture engineering; strength classes

Abstract

This study uses a loose tenon-mortise joint to assess the mechanical performance and classify the strength of chairs produced from Cassia (Senna siamea) and Neem (Azadirachta indica). These less common wood species were utilized to construct 40 chairs, which were then assembled using polyvinyl acetate total glue. A cyclic stepped rising loading method was used to assess the chairs’ performance in compliance with the European standard (EN 12520:2015). With seat and back load capacities categorized as low-strength (1516 to 1804 N), medium-strength (1805 to 2094 N) (fit for household usage), and high-strength (2095 N and above). Chairs with load capacities of 518–799 N were classified as low-strength, those between 800 and 1082 N as medium-strength, and those over 1083 N as high-strength for forward stability. Load capabilities were categorized as low-strength between 938 and 1149 N, medium-strength between 1150 and 1362 N, and high-strength above 1363 N based on sideways strength. This study advances knowledge of the strength performance of wooden chairs and offers useful information that may result in better furniture construction and customer satisfaction. Ghana’s national standard could incorporate the joint, timber species, and the strength classifications.

Copyright

© 2025 The Author(s)

Open Access

Open Access This chapter is licensed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International License (http://creativecommons.org/licenses/by-nc/4.0/), which permits any noncommercial use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license and indicate if changes were made.

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TY  - CONF
AU  - John Lawer Narh
AU  - Emmanuel Appiah-Kubi
AU  - Peter Kessels Dadzie
AU  - Isaac Agyei-Boakye
PY  - 2025
DA  - 2025/12/31
TI  - Strength Classification of Chairs made with Loose Tenon and Mortise Joint using Two Lesser-utilized Timber Species
BT  - Proceedings of the International Conference on Engineering, Science, and Urban Sustainability (ICESUS 2025)
PB  - Atlantis Press
SP  - 705
EP  - 722
SN  - 2352-5401
UR  - https://doi.org/10.2991/978-94-6463-970-4_43
DO  - 10.2991/978-94-6463-970-4_43
ID  - Narh2025
ER  -