Tensile and Cyclic Deformation Response of Aluminum Biphenylene-Based Graphene Composite Laminates: An Atomistic Simulation Study

In this study, the response of aluminum biphenylene-based graphene composite laminates to tensile and cyclic deformation is investigated using molecular dynamics (MD) simulations. Perfect and defect (linear crack and circular hole) laminate composites are subjected to tensile and strain-controlled fatigue tests at temperatures of 50 and 100 K. Also, the effect of loading direction is investigated on the strength and fracture behavior. Based on the MD results, it is observed that the strength of the perfect laminate is greater during loading along the y-axis (9-12 GPa) than in the x-direction (1 GPa). Overall, the defects lower the strength of the composite laminates. Stacking faults are observed in aluminum at the onset of yield due to partial dislocation slip, which accumulate at the BPG layers, and new faults extend through the multilayer aluminum. The plastic strain is not developed in the composite laminates subjected to elastic strain amplitudes during cyclic straining. However, the stress-strain loops expand in the plastic strain amplitude range (0.08). Breaking of a few C-C bonds, formation of voids, and bending of the BPG layer are observed during plastic deformation of the laminate. However, failure of the composite laminate is not observed under the present loading and temperature conditions.