Flexible disk couplings are components that enable the transmission of torque between two rotating shafts and accommodate some level of misalignment between them. These conditions dynamically force the coupling disk in an alternating Von Mises stress form due to fully reversed bending and constant torque. The stress state on the coupling disk leads to fatigue and failure of the joint, resulting in frequent equipment stops on the production line. This paper advances the study of flexible disk coupling by analyzing the structural stress state present in the disk, with 2d and 3d finite element analysis, when applying an angular misalignment to the coupling. For this purpose, a quasi-static analysis was performed using only torque and bending moment. In a second stage, the influence of the dynamic effects of the rotational speed of the shaft on the overall stress on the disk was observed, showing when it is suitable to analyze stress or fatigue conditions.