毛竹弦向断裂韧性
Tangential FractureT oughness of Bamboo
许敏敏 1孙正军 1王军 1李俊1
作者信息
摘要
用三点弯曲法研究带有初始裂纹的毛竹弦向的I型断裂行为。利用COD规测量试件的裂纹张开位移，确定试件裂纹尖端的扩展位移，得到载荷-位移曲线，并利用刚度割线法确定临界载荷PQ 的值，测定竹材的断裂韧性。结果表明：毛竹具有良好的断裂韧性，本实验中测得KIC平均值为17．10 MPa· m1/2。在显微镜下观察裂纹破坏模式，可知裂纹扩展并不是按照既定裂纹开口方向，而会沿纤维界面扩展。
Abstract
We studied the moso bamboo with initial crack of typeI by three point bending method.With COD gauge, we meas-ured the crack opening displacement to determine the crack tip extended displacement of the specimen and correct the in-dentation.We got a load-displacement curve and PQ by stiffness correction method.The bamboo has good fracture tough-ness, and the average is 17.10 MPa· m1/2 .Under the microscope, the crack propagation is not established in accordance with the crack opening direction and can extend along the fiber interface.
关键词
毛竹/弦向/COD规/裂纹张开位移/断裂韧性Key words
Moso bamboo/Tangential/COD gauge/Crack opening displacement/Fracture toughness引用本文复制引用
基金项目
出版年
2013
国家科技期刊平台
NSTL
维普
万方数据