Study on Morphology of Fracture of Wood-bamboo Composite Board

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(K_(1c)).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.