ACTA AERONAUTICAET ASTRONAUTICA SINICA >
Fatigue life prediction of laminated bolted joint structures
Received date: 2014-05-30
Revised date: 2014-07-03
Online published: 2014-08-04
In order to accurately predict the onset and progression of composite structures fatigue damage, a method on the basis of unidirectional laminates fatigue property is used to predict the fatigue life of laminated bolted joint structures. The primary task is fitting the parameter of normalized life model and residual strength by T300/BMP-316 laminates test data. An improved fracture toughness-based failure criterions are used to determine fatigue damage onset and propagation, while fiber and delamination failure criterion is added to matrix-dominated failure rule. A two-state load equivalent model is introduced to accumulate damage nonlinear before material property degradation. The error between predicted logarithm fatigue life and test results of different laminated composite structures is within 5% and the error at different stress levels is within 10%; the failure mode and failure region are shown to correlate well with test results.
Key words： composite materials; bolted joints; fatigue damage; fracture toughness; life cycle
LIU Jianming , WAN Xiaopeng , ZHAO Meiying . Fatigue life prediction of laminated bolted joint structures[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2015 , 36(6) : 1867 -1875 . DOI: 10.7527/S1000-6893.2014.0164
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