<p>This article investigates a novel configuration to improve the trailing edge bonding performance of wind turbine blades through numerical simulation. The trailing edge is a critical region prone to debonding and delamination, posing threats to the blade’s structural integrity. While previous studies have focused on joint strength and failure modes, this work proposes a new adhesive bond configuration aimed at enhancing the trailing edge’s resistance to failure. The proposed configuration incorporates an inserted substrate layer between the upper and lower shells in the trailing edge region, forming a double-lap joint instead of the conventional single-lap joint. Finite element models were developed to simulate the behavior of the proposed configuration under various loading conditions, including Tapered Double Cantilever Beam (TDCB), End Notched Flexure (ENF), and subcomponent tests. Validation against experimental results confirmed the accuracy of the numerical models. Comparative analyses revealed that the proposed configuration exhibited improved load-bearing capacity, stiffness, and resistance to crack initiation and propagation compared to the conventional configuration. The increased bonded area reduces shear stresses along the adhesive bond line. Additionally, the inserted laminate enhances bending stiffness, making the joint more resistant to buckling under compressive loads. This study demonstrates the potential of the proposed configuration to mitigate adhesive failure in wind turbine blade trailing edges, providing an innovative approach to strengthening interfaces against crack initiation and growth in bonded structures.</p>