This study examines the impact of delamination on shear stresses in bonded joints subjected to mechanical loads. The paper examines how different types and widths of delamination affect shear stress distribution in both the xz and zz planes, focusing on two common adhesive bonding configurations, simple overlap joints and end-to-end overlap joints. There is a notable increase in stress concentration as delamination width expands, according to experimental and simulated analyses. Longitudinal delamination also affects shear stresses, though to a lesser extent than transverse delamination. Maximum stress concentrations were observed in the presence of combined longitudinal and transverse delamination in the zz plane peeling stress, which is particularly sensitive to delamination effects. The study underscores the importance of considering delamination in the design and evaluation of bonded assemblies, highlighting how variations in delamination width and type can substantially impact structural performance. The study emphasizes how differences in delamination breadth and type can significantly effect structural performance, underscoring the need of taking delamination into account in the design and evaluation of bonded assemblies.