关键词: 竹材, 横纹断裂, 断裂损伤模型, 能量吸收机制

Abstract:

In this paper,the moso-mechanics method was applied to study the energy absorbing mechanism of the fracture pattern and pulling-out pattern of bamboo fiber during process of bamboo transverse bending fracture. The toughness contributed by the cracking pattern of ground tissue,the layering pattern of interface,the fracture pattern and pulling-out pattern of fiber was calculated actually. The results indicated that: 1) different organization structures contributed different toughness to the evolution of damage because of different energy wastage and among the four main structure factors that lead to the excellent toughness property of bamboo,the pulling-out of fiber contributed most and the fracture of fiber second. 2) the comparison between the test value of the total energy wastage of fracture and the calculated theory value of the total energy wastage of the four damage patterns showed that the two values were very close. It indicated that the physical model founded for the mechanics functions of different organization structures in the process of transverse bending damage was right.

Key words: bamboo, transverse fracture, damage pattern, energy absorbing mechanism