含诱导缺陷复合材料T型接头的弯曲失效实验  

The failure experiment of composite T-joints with induced defects under bending load

作　　者：吴海[1] 肖加余[1] 邢素丽[1] 文思维[1] 杨孚标[1] 杨金水[1] 

机构地区：[1]国防科技大学航天科学与工程学院,湖南长沙410073

出　　处：《国防科技大学学报》2015年第4期128-136,共9页Journal of National University of Defense Technology

基　　金：国家自然科学基金资助项目(11202231)

摘　　要：通过实验研究含不同诱导缺陷的复合材料T型接头的弯曲力学性能和失效过程,采用引入脱黏缺陷和三角区填充率缺陷来诱导T型接头的不同失效模式。结果表明不同失效模式下T型接头所表现出来的弯曲力学性能差异极大,完好的T型接头所能承受的载荷为288.5N,界面脱黏会削弱其30%的承载能力,而三角区填充率的减少会导致裂纹在填充区内部引发和扩展,导致T型接头的弯曲力学性能大幅降低。Bending experiments were carried out to investigate mechanical properties and failure processes of composite T-joints with two defects. The defects of interfacial debonding and fillet-filling ratio were introduced to induce different failure modes of the T-joints. Results suggest that a great diversity exists among the T-joints under various failure modes. The maximum bending load of the intact T-joint is 288.5N, while interfacial debonding will reduce its carrying capacity by 30%. The reduction of the fillet-filling ratio leads to the initiation and propagation of the cracks in the fillet, which greatly decreases bending mechanical properties of the composite T-joints.

关 键 词：复合材料T型接头 弯曲力学性能 失效过程 界面脱黏 三角区填充率 

分 类 号：TB332[一般工业技术—材料科学与工程]