This study was carried out to evaluate the strength of the three most frequent joints in the upholstered furniture frames, made of beech and poplar solid wood. The research included the following joints: Mortise and Tenon, double Dowel and double Gusset Plates, which were constructed and tested both in corner and middle joints. In the corner joints we examined the compression strength of the joints and in the middle joints the tension strength was thoroughly investigated. The results of the bending (compression) test indicated that bending strength values of the four different joints were strongly correlated to tension strength values of the corresponding joints, whether they were constructed with beech or poplar wood. Also, a correlation was noticed between the bending strength values of the joints constructed with beech and the bending strength values of the respective joints made of poplar wood. Relative to tension strength values, a strong relationship was also recorded between the beech wood joints and the poplar ones. Based on these results, it is concluded that the tension strength value of these joints could be sufficiently estimated by the measured bending strength value of the corresponding joints. Furthermore, the calculation of bending or tension strength of each of these three joints constructed with poplar wood gives the opportunity to calculate automatically and quite precisely, the corresponding strength value of the same joint constructed with beech wood.
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