Rate-related study on the ply orientation of carbon fiber reinforced epoxy composite laminates

Abstract In many practical situations, composite structures are often subjected to complex impact loadings ranging from low to high strain rates. Therefore, it is necessary to characterize the mechanical performance of composite materials at different strain rate. In this paper, carbon fiber-reinforced epoxy laminates with different stacking sequences and ply orientations under dynamic impact loadings were investigated by split Hopkinson pressure bar (SHPB) apparatus. Dynamic results were compared with quasi-static compression results. The experimental results show that the strength of specimens increased with the increase of strain rate. Specifically, the stacking sequence and ply orientation of composite laminates have great impacts on their strain rate sensitivities. Moreover, the failure modes of specimens under quasi-static and dynamic impact loadings were compared and analyzed from both macroscopic and microscopic scales. The fracture surface morphology show that the interface between fiber and matrix tends to be a ductile failure mode under higher strain rates. Finally, through optimization design, the balance point between strength and toughness of the composite laminate was investigated and suggested.

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