evaluation of using compressed poplar wood in manufacturing of wooden chairs

in this study, compressed poplar wood was used to improve the strengths of wooden chairs. these chairs were compared to chairs made from uncompressed poplar wood. wooden chairs were assembled with two types of traditional joints including mortise and tenon and wooden pins joints. the ultimate force was applied from the front to the back of the seat, were recorded according to american library association. the results showed that using of compressed poplar wood in manufacturing of the chairs led to a significant (95%) increase in strength properties. compared to the chairs of raw poplar wood, strength was increased up to 57.5% and 64.12% at chairs manufacured with compressed poplar wood and joint of mortise-tenon and dowel joints, respectively. joints of chairs made from raw poplar wood dislocated at back frames, but joint elements of chairs made with compressed poplar wood have lower move than other, and then the failure occurred at back frames. generally, the chair made of compressed poplar wood and with mortise-tenon joint showed a highest mechanical strength. moreover, wooden chair strength was improved by modification of wooden elements.