Graphene, a 1-atom-thick sheet of carbon, has remarkable strength and flexibility, but its fracture behavior at atomic steps remains poorly understood. Graphene’s strength is weaker at its edges which can limit its performance. This project uses atomic force microscopy to characterize fracture at graphene step edges and graphene-SiO₂ edges under varying applied forces. Preliminary results indicate a positive correlation between fracture probability and normal force, though more data needs to be collected. These findings provide insight into graphene’s fracture strength and inform potential applications where its durability under stress is critical.