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采用双悬臂梁试件对毛竹材层间Ⅰ型断裂的断裂问题开展了研究,基于虚拟裂缝模型,建立了不同初始缝长试件极限荷载与初始裂缝尖端区域局部断裂能gf的关系。通过试件极限荷载的理论值与试验值对比,确定了毛竹材无尺寸效应的层间Ⅰ型断裂能大小。结果表明:(1)不同龄期、不同高度、不同含水率的毛竹材,层间Ⅰ型断裂能的大小相同,为70N/m;(2)毛竹材层间Ⅰ型局部断裂能分布符合三线性模型,即靠近试件前后边界时,局部断裂能降低;远离边界时,局部断裂能保持为定值。
Based on the virtual fracture model, the relationship between the ultimate load and the local fracture energy gf of the initial crack tip region was established based on the double-cantilever specimen. By comparing the theoretical value of the ultimate load with the test value, the size of type Ⅰ fracture energy of the bamboo without dimension effect was determined. The results showed that: (1) The fracture energy of type I was the same for different age, height and moisture content of bamboo, which was 70N / m; (2) The linear model, that is, near the boundary before and after the specimen, can reduce the local fracture; away from the boundary, the local fracture can remain constant.