木材顺纹断裂韧度的研究进展

STATE-OF-THE-ART of WOOD FRACTURE TOUGHNESS ALONG THE GRAIN

木材的缺陷会使其在低应力状态下发生顺纹断裂,本文总结了木材抵抗顺纹断裂的重要力学参数——顺纹断裂韧度的研究进展.介绍了木材顺纹断裂韧度的测试方法,并分析了不同试验方法与数据处理方法的优缺点.重点阐述了影响木材顺纹断裂韧度的主要因素,如木材的种类、密度、含水率、木质纤维桥接作用以及试件跨高比等的影响.此外,也总结了木材顺纹断裂韧度尺寸效应的研究成果.并结合工程木被广泛应用的现状,介绍了木材胶结面断裂韧度的研究进展.

Defects may lead to wood fracture under low stress state. In this paper we summarize the state-of-the-art of wood fracture toughness along the grain, which is an important mechanical parameter of wood. We introduce main fracture toughness test methods, and analyze the advantages and disadvantages of different test methods and data processing methods. We focus on the related influence factors of the fracture toughness, such as wood species, density, moisture content, wood fiber bridging effect, specimen span/depth ratio, and so on.Moreover, we summarize the research results of the fracture toughness’s size effect. Considering the wide usage of engineered wood products in practice, the research sate of wood adhesive bonds fracture is also introduced.