Fatigue delamination growth of composite laminates with fiber bridging:Theory and simulation
Mode I fatigue delamination growth rates and thresholds of composite laminates have been experimentally studied.Due to the fiber bridging generated across fracture interface,additional fracture resistance was found rising with crack growth,which make the traditional Paris law and threshold model unsuitable.Therefore,novel models taking the normalized strain energy release rate as fracture governing parameter were developed.The delamination resistance during fatigue crack growth caused by interface fracture and fiber bridging was totally evaluated by a new parameter namely fatigue delamination resistance Gcf.Excellent agreement with the experimental data was achieved by the normalized fatigue delamination growth rate and threshold models.Numerical simulation method for fatigue delamination was subsequently investigated.The fracture constitutive behavior with fiber bridging was defined by a tri-linear cohesive zone law,in which fatigue damage was introduced by a parameter available for both fracture and bridging zones.Development of the degradation law of the damage parameter is based on the normalized fatigue delamination models,enabling a direct link with experimental data.The simulation was implemented using user defined interface elements within finite element software ABAQUS.
Delamination Fatigue crack growth Cohesive zone Damage degradation law Composites
Lei Peng Jifeng Xu
Beijing Aeronautical Science and Technology Research Institute,Beijing 102211,China
国际会议
北京
英文
1-10
2013-06-16（万方平台首次上网日期，不代表论文的发表时间）