국산수종의 휨가공성 평가

Evaluation of Bending Quality in Korean Wood Species

The aim of this study was to evaluate the bending quality(BQ) for ten kinds of main Korean wood spices and to investigate the effect of the metal strap thickness on the bending quality of Korean red pine. Bitter wood (Picrasma quassioides), horn beam (Carpinus laxiflora), birch (Betula schmidtii), painted maple (Acer mono) and cork opak (Quercus variabilis) showed excellent quality. Sargent cherry(Pinuns sargentii), Korean red pine (Pinus densiflora) and pitch pine (Pinus rigida) showed intermediate quality. Basswood (Tilia amurensis) and royal paulownia (Paulownia tomentosa) showed worse quality. The density of wood spices was the main factor to determine the bending quality. As for relationships between annual ring orientation and metal strap thickness, the bending quality of specimens with intermediate annual ring orientations was better than that of flat-grained specimens in the strap thickness of 1.0 ㎜ and 0.8 ㎜, while the reverse result was obtained in the strap thickness of 0.6 ㎜ and 0.4 ㎜. These findings suggested that it was important to determine the appropriate strap thickness in relation to wood species, thickness of specimens, form radii and annual ring orientations in specimens.