期刊
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
卷 156, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.compositesa.2022.106834
关键词
A; Laminates; B; Fracture toughness; C; Damage mechanics; Polymer-matrix composites (PMCs)
This paper characterizes the dynamic fracture toughness of laminated composites in fibre kinking mode and its evolution with crack growth at high loading rates. The study found that the fracture toughness remains constant at the initiation of fibre kinking damage, but decreases noticeably during the kinking band growth stage at higher loading rates. Two different types of damage evolution were observed depending on the amount of delamination involved.
Dynamic fracture toughness of laminated composites in fibre kinking mode, and its evolution with crack growth, is characterized in this paper at high loading rate. The compact compression specimen was loaded with electromagnetic Hopkinson bars at a velocity of up to 3.5 m/s. The measured surface displacement/strain fields with digital image correlation were analysed with the J-integral method, and energy dissipation during initiation and propagation of fibre kinking band was obtained at different loading rates. The fracture toughness at the initiation of fibre kinking damage remains constant in all tests, while during kinking band growth stage, it has been found to decrease noticeably at higher loading rate. Two different types of damage evolution have been observed in this study depending on the amount of delamination involved, as delamination can lead to a rapid drop of loading capacity, and results in relatively low fracture toughness after kinking band formation.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据