Mode I interlaminar fracture behavior of none-felt needled composites: Fid-Bau Portal

Mode I interlaminar fracture behavior of none-felt needled composites

Chen, Xiaoming / Yao, Tianlei / Li, Jiao / Wei, Yuying / Zheng, Hongwei / Ren, Zhipeng / Wu, Kaijie / Su, Xingzhao

Abstract None-felt needling technology is a novel 3D preform preparation technology, which improved the mechanical properties of needled preforms effectively. However, the mode I interlaminar fracture behavior of none-felt needled composite has not yet been clarified. In this paper, none-felt needled fabrics and their composites were prepared, the structure of the fabrics was characterized, and mode I interlaminar fracture performance of the composites were carried out through experiments and simulation method. It was found that none-felt needled composites showed effect on improving mode I interlaminar fracture property compared with the traditional needled composites, the maximum failure load and interlaminar fracture toughness ( $G_{IC}$ ) increased by up to 107% and 129% respectively. The double cantilever beam (DCB) experiment revealed that the failure mode of the none-felt needled composites were manifested as cracking of the matrix and brittle fracture of the needled fiber bundles. More content and thicker needled fiber bundles of none-felt needled fabric are important factors to improve the mode I interlaminar performance. Moreover, based on the failure mechanism and the structural features, mode I simulation model of none-felt needled composites was developed. The load–displacement curves obtained from the simulations were well closed to the experiment, and the error range was between 2.0% and 7.5%. None-felt needled composite structure with high interlaminar properties is hopeful to be applied in composite thin-walled components such as radomes and cabin sections of high-speed aircraft.

Graphical abstract Display Omitted

Highlights • The mode I interlaminar fracture behavior of none-felt needled composite was studied by experiment and simulation method. • None-felt needled composite showed great improvement in mode I interlaminar fracture property. • The maximum failure load and interlaminar fracture toughness ( $G_{IC}$ ) increased by up to 107% and 129% respectively. • The none-felt needled composite have more and thicker needled fiber bundles than the traditional needled composite. • The load-displacement curves obtained from the simulations were well closed to the experiment.