Prediction on fracture initiation at the interface corner of composite components
Delamination started from an interface corner is one of the major failure modes of cross-plied laminates and bonded/co-cured joints.This paper focuses on crack initiation at the interface corner of composite components.This paper suggests that the failure stress which is commonly used to predict the crack initiation should be replaced by a new term consisting of both stress intensity factor and singularity orders.With the utilization of published test results,finite element analysis is conducted to predict the singularity behavior of stress field in the vicinity of interface comer along the interface.Based on the analytical results,a new fracture criterion is proposed to predict the fracture initiation at the corner along the interface.The validation of this new criterion is also conducted in this paper.
Interface corner Failure stress Stress singularity Stress intensity factor Singularity order Fracture initiation Finite element method Failure criterion
Zhiguo Yu Bifeng Song Zonghong Xie
College of Aeronautics,Northwestern Polytechnical University,Xi an 710072,China College of Astronautics,Northwestern Polytechnical University,Xi an 710072,China
国际会议
成都
英文
177-181
2009-10-16（万方平台首次上网日期，不代表论文的发表时间）