A Progressive Damage Simulation Method for the Low Velocity Edge-impact Damage and Residual Compression Strength of Composite T-Stiffeners
CHEN Fang1, YAO Weixing1,2, WU Fuqiang1
1 State Key Laboratory of Mechanics and Control of Mechanical Structures, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China 2 Key Laboratory of Fundamental Science for National Defense-Advanced Design Technology of Flight Vehicle, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
Abstract: Composite materials have been widely used in aeronautical structures, even for main load-bearing structures, such as T-cross-sectional stiffe-ners. Impact damage, with low detectability could significantly reduce the residual compressive strength of T-stiffeners. In view of this, a progressive damage simulation process was proposed to predict the mechanical responses of T-stiffeners under impact and compression loading cases. By comparing the experimental data with the predicted values of the simulation model, it was shown that the simulation model could quantitatively give the impact crack length, compression failure strain and residual compression strength. Moreover, the stress-strain responses and final failure morphology could also be predicted by the simulation model. Therefore, the rationality and validity of the simulation method were verified.
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2020, Vol. 34 
