In this paper, finite element models were developed in ABAQUS for studying theinfluence of simulation-based low-velocity impact damage on the 4-probe electricalresistance of carbon fiber-reinforced polymer matrix (CFRP) laminates. The specimensin the current study were 16- and 32-ply AS4/3501-6 laminates with quasi-isotropiclayup. Electrical resistance in the CFRP laminates was evaluated using a 4-stepprocedure. First, FE models were created in ABAQUS for simulating low-velocityimpact using a quasi-static loading approach. Second, the stress results were importedinto Matlab, and delamination analysis was performed using approach developed by deMoura and Marques [1]. The delamination predictions were plotted onto a discretizedgrid for each interface between plies with dissimilar fiber orientations. Third, 4-probeelectrical FE models were developed in ABAQUS for specimens before and afterimpact using the concept of effective conducting thickness. The electrical conductivitywas reduced in the through-thickness direction for damaged elements in order torepresent the impact-induced delamination. Forth, a direct current of 10mA was appliedto the electrical models in order to determine the influence of the simulation-based lowvelocityimpact delamination on 4-probe electrical resistance using top and obliquemeasurement planes. For the top measurement plane, source and sensing electrodeswere placed in a single line on the top surface of the specimen. For the obliquemeasurement plane, positive source and sensing electrodes were placed on the topsurface, whereas the negative source and sensing electrodes were located on the bottomsurface of the specimen. Generally, the oblique resistance measurement was moresensitive to the impact damage compared to the top resistance measurement. In addition,the resistance of the 16-ply specimens was more greatly affected by the delaminationcompared to the 32-ply specimens. Electrical resistance predictions were compared tothe experimental data.
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