中文摘要：

采用二次回归正交组合设计法分析了含水率、裂纹长度和加载速率三个因素对竹木复合层合板断裂韧性（K1c）的影响。结果表明含水率对竹木复合层合板断裂韧性的影响最大；建立了含水率、裂纹长度和加载速率三个因素和断裂韧性（K1c）之间的回归方程。“Z”字型裂纹为纤维本身破坏形式，“T”字型和“V”字型为纤维间破坏形式。

英文摘要：

The morphology of fracture of wood-bamboo composite board was discussed. The moisture, crack-length, and loading-speed were analyzed, which can influence the wood-bamboo composite board＇s fracture toughness （K1c ）. The result showed that the moisture＇s influence degree is bigger than the loading-speed, and the loading-speed is bigger than the crack-length. At the same time, the regression equation between fracture toughness and the moisture, crack-length and loading-speed was built. The fracture crack in the shape of Z＇is the breakage of wood fiber, the fracture cracks in the shape of T＇and V＇are the breakages between wood fibers.