Mode I and mode II initiation fracture toughness and resistance curve of medium density fiberboard measured by double cantilever beam and three-point bend end-notched flexure tests
Mode I and mode II initiation fracture toughness and resistance curve of medium density fiberboard measured by double cantilever beam and three-point bend end-notched flexure tests
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DOI：
10.1016/j.engfracmech.2010.06.015
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发表时间：
2010-09
影响因子：
5.4
通讯作者：
H. Yoshihara
中科院分区：
文献类型：
--
作者：
H. Yoshihara
采用中密度纤维板试件，进行了双悬臂梁和三点弯曲端部切口弯曲试验，获得了面内和全厚度体系的Ⅰ型和Ⅱ型起裂韧性和阻力曲线。对于面内裂纹系统，模式I的起裂韧性小于模式II的起裂韧性，但对于贯穿厚度系统，这种趋势是相反的。裂纹扩展过程中，由于裂纹面之间产生了明显的纤维桥接，导致断裂韧性增加，但当裂纹扩展到一定长度后，I型扩展断裂韧性的增加有所减缓。相反，在裂纹扩展过程中，II型扩展断裂韧性不断增加。
Using specimens of medium density fiberboard, double cantilever beam and three-point bend end-notched flexure tests were conducted to obtain the mode I and mode II initiation fracture toughness and resistance curve for in-plane and through-the-thickness systems. The mode I initiation fracture toughness was smaller than that of mode II for the in-plane crack systems, but this tendency was inverse for the through-the-thickness systems. The fracture toughness increased during the crack propagation because of the significant fiber bridgings induced between the crack surfaces, but the increase of the mode I propagation fracture toughness was moderated after the crack reached a certain length. In contrast, the mode II propagation fracture toughness continuously increased during the crack propagation.