利用紅外線熱像技術檢測木材靜曲試驗破壞時之表面溫度

Detecting the Surface Temperature of Wood Fracture in Static Bending Test Using an Infrared Thermographic Technique

余欣怡(Hsin-Yi Yu) ； 黃國雄(Gwo-Shyong Hwang)

《林產工業》 27卷1期 (2008/03) Pp. 25-30

摘要

本研究旨在探討木材靜曲破壞時表面溫度上升之情形並提供木材破壞之訊息，試驗中以杉木與台灣櫸之氣乾材為試驗材料，將其鋸製成20 mm （R） × 20 mm （T） × 320 mm （L）之試片後，於載重方向分別為徑向與弦向之條件下進行靜曲強度試驗，並利用紅外線熱像儀檢測破壞時試材表面溫度之變化。由試驗結果得知無論是杉木或是台灣櫸於靜曲破壞時，位於試材中立軸下方引張部之表面溫度上升較上方壓縮部者明顯增大，且弦向載重時之表面溫度上升均較徑向者大，雖然台灣櫸靜曲強度較杉木大，但其破壞時表面溫度上升較杉木者小，顯示靜曲破壞時表面溫度上升受樹種即靜曲強度之影響不明顯。

關鍵字

紅外線熱像儀 ； 木材強度 ； 靜曲試驗 ； 表面溫度

並列摘要

The purpose of this study was to investigate the temperature rise on wood surface and provide the information of fracture during the static bending test. The air-dried China fir(Cunninghamia lanceolata) and Taiwan zelkova(Zelkova serrata) wood specimens were cut to the size of 20 mm (T) × 20 mm (R) × 320 mm (L) along radial and tangential loading directions for static bending test. The surface temperature rise at wood fracture during the loading procedure was measured with a thermographic device. The temperature rise on the tension side was remarkably higher than that of compression side during the bending fracture for both specimens of China fir and Taiwan zelkova. Although the bending strength of Taiwan zelkova was stronger than that of China fir, however the lower temperature rise in bending fracture was observed. It showed that the temperature rises at bending fracture were not significantly affected by wood species, or the bending strength.

並列關鍵字

Infrared thermography ； Wood strength ； Static bending test ； Surface temperature