ACTA AERONAUTICAET ASTRONAUTICA SINICA >
Delamination damage and critical interference percentage for interference fit bolt joint of laminates
Received date: 2015-07-16
Revised date: 2015-08-28
Online published: 2015-09-02
Supported by
National Natural Science Foundation of China (51275410, 51305349)
The interference fit joint of composite laminates boasts high performance, which is the development trend of composite structures in aircraft. However, delamination damage is easy to occur during the interference fit process. So the delamination damage and critical interference percentage are investigated during the interference fit process of carbon fiber reinforced plastics (CFRP) laminates by theoretical modeling and finite element method. Firstly, the mechanical behavior of interference fit bolt joint process and delamination damage are analyzed. Secondly, the critical thrust force without delamination damage of each interlaminar interface is modeled based on the virtual work principle, and then the critical interference percentage is predicted depending on the relation of inserting force and interference value. Finally, the interference fit bolt joint process of CFRP laminates is simulated by ABAQUS platform, and cohesive elements are applied in the interlaminar interface to simulating delamination damage mechanism of various interference percentages. In addition, microscopic delamination damage is evaluated by scanning electron microscope (SEM) in experiments. It is observed that the interference percentage is the principal parameter inducing delamination damage of CFRP laminates. The critical thrust force and critical interference percentage without delamination damage of CFRP laminates decrease with the interlaminar interface moving downward, which indicates that the closer to the bottom of CFRP laminates, the easier to be delamination.
Key words： CFRP; interference fit; delamination; FEA; cohesive element; critical interference percentage
SONG Danlong , ZHANG Kaifu , ZHONG Heng , LI Yuan . Delamination damage and critical interference percentage for interference fit bolt joint of laminates[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2016 , 37(5) : 1677 -1688 . DOI: 10.7527/S1000-6893.2015.0242
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