open access

https://hdl.handle.net/2115/58296

Evaluation of mechanical performance of shrink-fit joint for round mortise and tenon in green woodwork

日本語

bending strength

2015-03

北海道大学北方生物圏フィールド科学センター 森林圏ステーション

Research Bulletin of the Hokkaido University Forests

70(1)

9-20

生木によるものづくり「グリーンウッドワーク」において，家具製作に多用される丸ほぞ収縮接合の性能評価を行った。本研究では湿度変動を考慮した，接着接合に対する収縮接合の相対評価を行った。ミズナラ，ハルニレ，およびSPF 製材を用い，T 型試験体による単調引抜試験とL 型試験体によるモーメント負荷（曲げ）試験を行った結果，収縮接合は，部材の部分圧縮強度，収縮率，および，かん合度の条件次第で接着接合に匹敵する引抜強度を発現する可能性が示唆された。しかし，湿度変動を経た試験体で，強度は大きく低下した。曲げ強さと接合部剛性に関しては，接着接合と収縮接合の間で有意差は認められなかった。

紀要論文

Version of Record

Mechanical performance of shrink-fit joint for round mortise and tenon was evaluated. This joint is often used in making furniture from green wood. In this study, the evaluation was made with comparison to glued-fit joint. The effects of humidity cycle of the performance were also considered. The experiments were withdrawal test using T-type specimens, and bending-fracture tests using L-type specimens. Tested species were oak (Quercus crispula), elm (Ulmus davidiana var. japonica) and SPF lumber (mixture of spruce, pine and fir). It was found that withdrawal strength of shrink-fit joint was comparable with that of glued-fit joint, if the conditions of the partial bearing strength, the amounts of swelling and shrinkage, and the fit after the curing period were adequate. However, withdrawal strength of shrink-fit joint considerably decreased after a cycle of humidity change. On the other hand, bending strength and joint stiffness of shrink-fit joint were comparable with those of glued-fit joint. Furthermore, a cycle of humidity change did not affect the bending strength and joint stiffness.

1347-0981